TY  - CONF
AU  - Kus, Jolanta
AU  - Dolezych, Martina
AU  - Schneider, Wilfrid
AU  - Hower, James
AU  - Hofmann, Tamás
AU  - Visiné Rajczi, Eszter
AU  - Sachsenhofer, Reinhard
AU  - Bechtel, Achim
AU  - Stojanović, Ksenija
AU  - Životić, Dragana
AU  - Kojić, Ivan
AU  - Mastalerz, Maria
AU  - Graupner, Torsten
AU  - Lukens, William
AU  - Donaldson, Lloyd
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6401
AB  - Fossil wood with well-preserved cellulose is detected in open-cast mines of the Miocene Lusatia lignite-mining district (eastern Germany). Aimed to explain the preservation of cellulose, an organic geochemical study was performed on the fossil wood samples and intact heartwood tissues of the respective modern woody species. The results of micro Fourier transform infrared (micro-FTIR) spectroscopy, biomarker distributions and δ13C values indicate that the preservation of cellulose in fossil wood samples was governed by reducing conditions. Furthermore, it can be also attributed to weathering of the surrounding tuff- and rhyolite-dominated acidic volcanic rock that might have caused lowering of pH. All fossil wood samples contain minor hopanoids, implying negligible post-depositional microbial degradation of OM. Limited microbial degradation of OM could be also caused by protection of the wood by conifer resins. For example, fossil Cupressaceae sensu lato, as confirmed by detection of hibaene, totarane, and cuparene, was more resinous than the modern forms. The absence of perylene in fossil wood indicates the limited degradation of wood by fungi.
PB  - European Association of Geoscientists and Engineers
C3  - 31st International Meeting on Organic Geochemistry
T1  - The Preservation of Cellulose in Fossil Wood – Implications from Organic Geochemical Study of Fossil and Modern Wood
SP  - 109
EP  - 109
DO  - 10.3997/2214-4609.202333109
ER  - 

@conference{
author = "Kus, Jolanta and Dolezych, Martina and Schneider, Wilfrid and Hower, James and Hofmann, Tamás and Visiné Rajczi, Eszter and Sachsenhofer, Reinhard and Bechtel, Achim and Stojanović, Ksenija and Životić, Dragana and Kojić, Ivan and Mastalerz, Maria and Graupner, Torsten and Lukens, William and Donaldson, Lloyd",
year = "2023",
abstract = "Fossil wood with well-preserved cellulose is detected in open-cast mines of the Miocene Lusatia lignite-mining district (eastern Germany). Aimed to explain the preservation of cellulose, an organic geochemical study was performed on the fossil wood samples and intact heartwood tissues of the respective modern woody species. The results of micro Fourier transform infrared (micro-FTIR) spectroscopy, biomarker distributions and δ13C values indicate that the preservation of cellulose in fossil wood samples was governed by reducing conditions. Furthermore, it can be also attributed to weathering of the surrounding tuff- and rhyolite-dominated acidic volcanic rock that might have caused lowering of pH. All fossil wood samples contain minor hopanoids, implying negligible post-depositional microbial degradation of OM. Limited microbial degradation of OM could be also caused by protection of the wood by conifer resins. For example, fossil Cupressaceae sensu lato, as confirmed by detection of hibaene, totarane, and cuparene, was more resinous than the modern forms. The absence of perylene in fossil wood indicates the limited degradation of wood by fungi.",
publisher = "European Association of Geoscientists and Engineers",
journal = "31st International Meeting on Organic Geochemistry",
title = "The Preservation of Cellulose in Fossil Wood – Implications from Organic Geochemical Study of Fossil and Modern Wood",
pages = "109-109",
doi = "10.3997/2214-4609.202333109"
}

Kus, J., Dolezych, M., Schneider, W., Hower, J., Hofmann, T., Visiné Rajczi, E., Sachsenhofer, R., Bechtel, A., Stojanović, K., Životić, D., Kojić, I., Mastalerz, M., Graupner, T., Lukens, W.,& Donaldson, L.. (2023). The Preservation of Cellulose in Fossil Wood – Implications from Organic Geochemical Study of Fossil and Modern Wood. in 31st International Meeting on Organic Geochemistry
European Association of Geoscientists and Engineers., 109-109.
https://doi.org/10.3997/2214-4609.202333109

Kus J, Dolezych M, Schneider W, Hower J, Hofmann T, Visiné Rajczi E, Sachsenhofer R, Bechtel A, Stojanović K, Životić D, Kojić I, Mastalerz M, Graupner T, Lukens W, Donaldson L. The Preservation of Cellulose in Fossil Wood – Implications from Organic Geochemical Study of Fossil and Modern Wood. in 31st International Meeting on Organic Geochemistry. 2023;:109-109.
doi:10.3997/2214-4609.202333109 .

Kus, Jolanta, Dolezych, Martina, Schneider, Wilfrid, Hower, James, Hofmann, Tamás, Visiné Rajczi, Eszter, Sachsenhofer, Reinhard, Bechtel, Achim, Stojanović, Ksenija, Životić, Dragana, Kojić, Ivan, Mastalerz, Maria, Graupner, Torsten, Lukens, William, Donaldson, Lloyd, "The Preservation of Cellulose in Fossil Wood – Implications from Organic Geochemical Study of Fossil and Modern Wood" in 31st International Meeting on Organic Geochemistry (2023):109-109,
https://doi.org/10.3997/2214-4609.202333109 . .

TY  - JOUR
AU  - Kojić, Ivan
AU  - Bechtel, Achim
AU  - Aleksić, Nikoleta
AU  - Životić, Dragana R.
AU  - Trifunović, Snežana S.
AU  - Gajica, Gordana
AU  - Stojanović, Ksenija A.
PY  - 2021
UR  - https://www.mdpi.com/2073-4360/13/5/759
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4397
AB  - The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography–mass spectrometry (GC–MS), specific carbon isotope analysis of individual hydrocarbons (δ13C), Rock-Eval pyrolysis, and elemental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrolysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lignite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.
PB  - MDPI
T2  - Polymers
T1  - Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal
VL  - 13
IS  - 5
SP  - 759
DO  - 10.3390/polym13050759
ER  - 

@article{
author = "Kojić, Ivan and Bechtel, Achim and Aleksić, Nikoleta and Životić, Dragana R. and Trifunović, Snežana S. and Gajica, Gordana and Stojanović, Ksenija A.",
year = "2021",
abstract = "The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography–mass spectrometry (GC–MS), specific carbon isotope analysis of individual hydrocarbons (δ13C), Rock-Eval pyrolysis, and elemental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrolysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lignite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.",
publisher = "MDPI",
journal = "Polymers",
title = "Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal",
volume = "13",
number = "5",
pages = "759",
doi = "10.3390/polym13050759"
}

Kojić, I., Bechtel, A., Aleksić, N., Životić, D. R., Trifunović, S. S., Gajica, G.,& Stojanović, K. A.. (2021). Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal. in Polymers
MDPI., 13(5), 759.
https://doi.org/10.3390/polym13050759

Kojić I, Bechtel A, Aleksić N, Životić DR, Trifunović SS, Gajica G, Stojanović KA. Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal. in Polymers. 2021;13(5):759.
doi:10.3390/polym13050759 .

Kojić, Ivan, Bechtel, Achim, Aleksić, Nikoleta, Životić, Dragana R., Trifunović, Snežana S., Gajica, Gordana, Stojanović, Ksenija A., "Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal" in Polymers, 13, no. 5 (2021):759,
https://doi.org/10.3390/polym13050759 . .

TY  - DATA
AU  - Kojić, Ivan
AU  - Bechtel, Achim
AU  - Aleksić, Nikoleta
AU  - Životić, Dragana R.
AU  - Trifunović, Snežana S.
AU  - Gajica, Gordana
AU  - Stojanović, Ksenija A.
PY  - 2021
UR  - https://www.mdpi.com/2073-4360/13/5/759
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4398
PB  - MDPI
T2  - Polymers
T1  - Supplementary data for the article: Kojić, I.; Bechtel, A.; Aleksić, N.; Životić, D.; Trifunović, S.; Gajica, G.; Stojanović, K. Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal. Polymers 2021, 13 (5), 759. https://doi.org/10.3390/polym13050759.
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4398
ER  - 

@misc{
author = "Kojić, Ivan and Bechtel, Achim and Aleksić, Nikoleta and Životić, Dragana R. and Trifunović, Snežana S. and Gajica, Gordana and Stojanović, Ksenija A.",
year = "2021",
publisher = "MDPI",
journal = "Polymers",
title = "Supplementary data for the article: Kojić, I.; Bechtel, A.; Aleksić, N.; Životić, D.; Trifunović, S.; Gajica, G.; Stojanović, K. Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal. Polymers 2021, 13 (5), 759. https://doi.org/10.3390/polym13050759.",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4398"
}

Kojić, I., Bechtel, A., Aleksić, N., Životić, D. R., Trifunović, S. S., Gajica, G.,& Stojanović, K. A.. (2021). Supplementary data for the article: Kojić, I.; Bechtel, A.; Aleksić, N.; Životić, D.; Trifunović, S.; Gajica, G.; Stojanović, K. Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal. Polymers 2021, 13 (5), 759. https://doi.org/10.3390/polym13050759.. in Polymers
MDPI..
https://hdl.handle.net/21.15107/rcub_cherry_4398

Kojić I, Bechtel A, Aleksić N, Životić DR, Trifunović SS, Gajica G, Stojanović KA. Supplementary data for the article: Kojić, I.; Bechtel, A.; Aleksić, N.; Životić, D.; Trifunović, S.; Gajica, G.; Stojanović, K. Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal. Polymers 2021, 13 (5), 759. https://doi.org/10.3390/polym13050759.. in Polymers. 2021;.
https://hdl.handle.net/21.15107/rcub_cherry_4398 .

Kojić, Ivan, Bechtel, Achim, Aleksić, Nikoleta, Životić, Dragana R., Trifunović, Snežana S., Gajica, Gordana, Stojanović, Ksenija A., "Supplementary data for the article: Kojić, I.; Bechtel, A.; Aleksić, N.; Životić, D.; Trifunović, S.; Gajica, G.; Stojanović, K. Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal. Polymers 2021, 13 (5), 759. https://doi.org/10.3390/polym13050759." in Polymers (2021),
https://hdl.handle.net/21.15107/rcub_cherry_4398 .

TY  - JOUR
AU  - Burazer, Nikola
AU  - Šajnović, Aleksandra
AU  - Vasić, Nebojša
AU  - Kašanin-Grubin, Milica
AU  - Životić, Dragana R.
AU  - Mendonça Filho, João Graciano
AU  - Vulić, Predrag J.
AU  - Jovančićević, Branimir
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3837
AB  - The investigation of the relationship between paleoenvironmental conditions and distribution and relative abundance of specific saturated and aromatic hydrocarbons was the main objective of this study, thus marking the parameters, which were most sensitive to environmental changes. Insights on the type, generative potential, and maturity of organic matter (OM), as well as paleoclimate conditions, along with the reconstruction of depositional settings of the northwest part of the Toplica basin (Serbia), were provided. Organic petrographic, palynofacies, organic geochemical, mineralogical, and XRF analyses were carried out to investigate 40 sediment samples of the Prebreza and Čučale sedimentary units. Investigated samples were deposited in the saline and anoxic environment, under semi-arid to semi-humid/humid climate conditions, along with the constant inflow of volcanoclastic material. The predominance of δ-methyltrimethyltridecil chroman (δ-MTTC) within euxinic portions of the stratified water column was associated with an increase in salinity, which was noticed for sediments of the Prebreza unit. Sediments from this stratigraphic unit showed a higher contribution of algae precursor, whereas sediments of the Čučale unit suggested higher participation of microbiologically reworked OM. Most of the samples contained oil-prone kerogen type II. Maturity of the OM for sediments of the Prebreza unit ranged from immature to early-mature, while for samples of the Čučale unit varied from early-mature to mature stages. Distribution of hopane biomarkers typical for crude oil indicated that depth of 1 km was a boundary for the genesis of thermodynamic, more stable compounds. A significant portion of semifusinite was correlated with the paleofire event, which affected the distribution of n-alkanes. The high production of hydrocarbons was related to volcanic activity. Parameters, which proved to be highly susceptible at the stratigraphic boundary between the Prebreza and Čučale units, were C-value, S/H, α-MTTC, δ-MTTC, β-/γ-MTTC, and (1,3- + 1,6-)/(1,4 + 1,5-DMC), respectively.
PB  - Elsevier
T2  - Marine and Petroleum Geology
T1  - Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia
VL  - 115
SP  - 104252
DO  - 10.1016/j.marpetgeo.2020.104252
ER  - 

@article{
author = "Burazer, Nikola and Šajnović, Aleksandra and Vasić, Nebojša and Kašanin-Grubin, Milica and Životić, Dragana R. and Mendonça Filho, João Graciano and Vulić, Predrag J. and Jovančićević, Branimir",
year = "2020",
abstract = "The investigation of the relationship between paleoenvironmental conditions and distribution and relative abundance of specific saturated and aromatic hydrocarbons was the main objective of this study, thus marking the parameters, which were most sensitive to environmental changes. Insights on the type, generative potential, and maturity of organic matter (OM), as well as paleoclimate conditions, along with the reconstruction of depositional settings of the northwest part of the Toplica basin (Serbia), were provided. Organic petrographic, palynofacies, organic geochemical, mineralogical, and XRF analyses were carried out to investigate 40 sediment samples of the Prebreza and Čučale sedimentary units. Investigated samples were deposited in the saline and anoxic environment, under semi-arid to semi-humid/humid climate conditions, along with the constant inflow of volcanoclastic material. The predominance of δ-methyltrimethyltridecil chroman (δ-MTTC) within euxinic portions of the stratified water column was associated with an increase in salinity, which was noticed for sediments of the Prebreza unit. Sediments from this stratigraphic unit showed a higher contribution of algae precursor, whereas sediments of the Čučale unit suggested higher participation of microbiologically reworked OM. Most of the samples contained oil-prone kerogen type II. Maturity of the OM for sediments of the Prebreza unit ranged from immature to early-mature, while for samples of the Čučale unit varied from early-mature to mature stages. Distribution of hopane biomarkers typical for crude oil indicated that depth of 1 km was a boundary for the genesis of thermodynamic, more stable compounds. A significant portion of semifusinite was correlated with the paleofire event, which affected the distribution of n-alkanes. The high production of hydrocarbons was related to volcanic activity. Parameters, which proved to be highly susceptible at the stratigraphic boundary between the Prebreza and Čučale units, were C-value, S/H, α-MTTC, δ-MTTC, β-/γ-MTTC, and (1,3- + 1,6-)/(1,4 + 1,5-DMC), respectively.",
publisher = "Elsevier",
journal = "Marine and Petroleum Geology",
title = "Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia",
volume = "115",
pages = "104252",
doi = "10.1016/j.marpetgeo.2020.104252"
}

Burazer, N., Šajnović, A., Vasić, N., Kašanin-Grubin, M., Životić, D. R., Mendonça Filho, J. G., Vulić, P. J.,& Jovančićević, B.. (2020). Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia. in Marine and Petroleum Geology
Elsevier., 115, 104252.
https://doi.org/10.1016/j.marpetgeo.2020.104252

Burazer N, Šajnović A, Vasić N, Kašanin-Grubin M, Životić DR, Mendonça Filho JG, Vulić PJ, Jovančićević B. Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia. in Marine and Petroleum Geology. 2020;115:104252.
doi:10.1016/j.marpetgeo.2020.104252 .

Burazer, Nikola, Šajnović, Aleksandra, Vasić, Nebojša, Kašanin-Grubin, Milica, Životić, Dragana R., Mendonça Filho, João Graciano, Vulić, Predrag J., Jovančićević, Branimir, "Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia" in Marine and Petroleum Geology, 115 (2020):104252,
https://doi.org/10.1016/j.marpetgeo.2020.104252 . .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Cvetković, Olga
AU  - Vulić, Predrag J.
AU  - Gržetić, Ivan
AU  - Simić, Vladimir
AU  - Ilijević, Konstantin
AU  - Dojčinović, Biljana P.
AU  - Erić, Suzana
AU  - Radić, Bogdan
AU  - Stojadinović, Sanja M.
AU  - Trifunović, Snežana S.
PY  - 2019
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2897
AB  - A geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). The most abundant minerals in all lignite samples from the three coal seams are clays (illite/smectite), silicates (quartz, plagioclase), sulphates (gypsum/anhydrite) and carbonate (calcite). The other iron-rich minerals are sulphides, oxides and hydroxides (pyrite, mag-netite, haematite, and limonite). In general, mineral matter in the matrix coal consists of illite/ smectite and quartz, while xylite-rich coals, apart from illite/smectite, have a higher content of sulphates and Fe-oxide/hydroxide minerals. The lignite from the Kovin deposit is enriched in As, Cd, Co, Cr, Cu, Ga, Li, Mn, Mo, Ni, Pb, V, Zn, Gd, Tb, Er and Lu in comparison with the Clarke values for brown coals. The statistical analysis of bulk compositional data shows inorganic affinity for the majority of the major and trace elements and possible association with pyrite, illite/ smectite and calcite.
PB  - Crossref
T2  - Geologia Croatica
T1  - Distribution of major and trace elements in the Kovin lignite (Serbia)
VL  - 72
IS  - 1
SP  - 51
EP  - 79
DO  - 10.4154/gc.2019.06
ER  - 

@article{
author = "Životić, Dragana R. and Cvetković, Olga and Vulić, Predrag J. and Gržetić, Ivan and Simić, Vladimir and Ilijević, Konstantin and Dojčinović, Biljana P. and Erić, Suzana and Radić, Bogdan and Stojadinović, Sanja M. and Trifunović, Snežana S.",
year = "2019, 2019",
abstract = "A geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). The most abundant minerals in all lignite samples from the three coal seams are clays (illite/smectite), silicates (quartz, plagioclase), sulphates (gypsum/anhydrite) and carbonate (calcite). The other iron-rich minerals are sulphides, oxides and hydroxides (pyrite, mag-netite, haematite, and limonite). In general, mineral matter in the matrix coal consists of illite/ smectite and quartz, while xylite-rich coals, apart from illite/smectite, have a higher content of sulphates and Fe-oxide/hydroxide minerals. The lignite from the Kovin deposit is enriched in As, Cd, Co, Cr, Cu, Ga, Li, Mn, Mo, Ni, Pb, V, Zn, Gd, Tb, Er and Lu in comparison with the Clarke values for brown coals. The statistical analysis of bulk compositional data shows inorganic affinity for the majority of the major and trace elements and possible association with pyrite, illite/ smectite and calcite.",
publisher = "Crossref",
journal = "Geologia Croatica",
title = "Distribution of major and trace elements in the Kovin lignite (Serbia)",
volume = "72",
number = "1",
pages = "51-79",
doi = "10.4154/gc.2019.06"
}

Životić, D. R., Cvetković, O., Vulić, P. J., Gržetić, I., Simić, V., Ilijević, K., Dojčinović, B. P., Erić, S., Radić, B., Stojadinović, S. M.,& Trifunović, S. S.. (2019). Distribution of major and trace elements in the Kovin lignite (Serbia). in Geologia Croatica
Crossref., 72(1), 51-79.
https://doi.org/10.4154/gc.2019.06

Životić DR, Cvetković O, Vulić PJ, Gržetić I, Simić V, Ilijević K, Dojčinović BP, Erić S, Radić B, Stojadinović SM, Trifunović SS. Distribution of major and trace elements in the Kovin lignite (Serbia). in Geologia Croatica. 2019;72(1):51-79.
doi:10.4154/gc.2019.06 .

Životić, Dragana R., Cvetković, Olga, Vulić, Predrag J., Gržetić, Ivan, Simić, Vladimir, Ilijević, Konstantin, Dojčinović, Biljana P., Erić, Suzana, Radić, Bogdan, Stojadinović, Sanja M., Trifunović, Snežana S., "Distribution of major and trace elements in the Kovin lignite (Serbia)" in Geologia Croatica, 72, no. 1 (2019):51-79,
https://doi.org/10.4154/gc.2019.06 . .

TY  - JOUR
AU  - Nytoft, Hans Peter
AU  - Kildahl-Andersen, Geir
AU  - Lindström, Sofie
AU  - Rise, Frode
AU  - Bechtel, Achim
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2811
AB  - Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian
lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using
NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10→20)-abeo-abietane or
icetexane skeleton consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of
the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging fromTriassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis+ trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%Rr) above 0.5 suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetaxanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.
PB  - Elsevier
T2  - Organic Geochemistry
T1  - Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae
DO  - 10.1016/j.orggeochem.2019.01.001
ER  - 

@article{
author = "Nytoft, Hans Peter and Kildahl-Andersen, Geir and Lindström, Sofie and Rise, Frode and Bechtel, Achim and Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Stojanović, Ksenija A.",
year = "2019",
abstract = "Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian
lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using
NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10→20)-abeo-abietane or
icetexane skeleton consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of
the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging fromTriassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis+ trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%Rr) above 0.5 suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetaxanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.",
publisher = "Elsevier",
journal = "Organic Geochemistry",
title = "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae",
doi = "10.1016/j.orggeochem.2019.01.001"
}

Nytoft, H. P., Kildahl-Andersen, G., Lindström, S., Rise, F., Bechtel, A., Mitrović, D. D., Đoković, N., Životić, D. R.,& Stojanović, K. A.. (2019). Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry
Elsevier..
https://doi.org/10.1016/j.orggeochem.2019.01.001

Nytoft HP, Kildahl-Andersen G, Lindström S, Rise F, Bechtel A, Mitrović DD, Đoković N, Životić DR, Stojanović KA. Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry. 2019;.
doi:10.1016/j.orggeochem.2019.01.001 .

Nytoft, Hans Peter, Kildahl-Andersen, Geir, Lindström, Sofie, Rise, Frode, Bechtel, Achim, Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Stojanović, Ksenija A., "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae" in Organic Geochemistry (2019),
https://doi.org/10.1016/j.orggeochem.2019.01.001 . .

TY  - JOUR
AU  - Nytoft, Hans Peter
AU  - Kildahl-Andersen, Geir
AU  - Lindström, Sofie
AU  - Rise, Frode
AU  - Bechtel, Achim
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Stojanović, Ksenija A.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2846
AB  - Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10 → 20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging from Triassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis + trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%R r ) above 0.5, suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetexanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.
PB  - Elsevier
T2  - Organic Geochemistry
T1  - Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae
VL  - 129
SP  - 14
EP  - 23
DO  - 10.1016/j.orggeochem.2019.01.001
ER  - 

@article{
author = "Nytoft, Hans Peter and Kildahl-Andersen, Geir and Lindström, Sofie and Rise, Frode and Bechtel, Achim and Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Stojanović, Ksenija A.",
year = "2019",
abstract = "Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMR-spectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10 → 20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270 → 146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant in high latitude coals and mudstones ranging from Triassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis + trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite reflectance (%R r ) above 0.5, suggesting an equilibrium from the start of the oil window. Dehydroicetexanes are more stable than dehydroabietane and some oils, rich in dehydroicetexanes, contain no dehydroabietane. Precursors could be plant diterpenoids having the icetexane structure, which have been known for more than 40 years and isolated from a variety of higher plant sources, including some angiosperms. Many of the relatively simple icetexanes were isolated for the first time from Chamaecyparis pisifera and related species where they seem to be particularly abundant, suggesting that dehydroicetexanes may be used as markers for the genus Chamaecyparis or for Cupressoideae in general.",
publisher = "Elsevier",
journal = "Organic Geochemistry",
title = "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae",
volume = "129",
pages = "14-23",
doi = "10.1016/j.orggeochem.2019.01.001"
}

Nytoft, H. P., Kildahl-Andersen, G., Lindström, S., Rise, F., Bechtel, A., Mitrović, D. D., Đoković, N., Životić, D. R.,& Stojanović, K. A.. (2019). Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry
Elsevier., 129, 14-23.
https://doi.org/10.1016/j.orggeochem.2019.01.001

Nytoft HP, Kildahl-Andersen G, Lindström S, Rise F, Bechtel A, Mitrović DD, Đoković N, Životić DR, Stojanović KA. Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae. in Organic Geochemistry. 2019;129:14-23.
doi:10.1016/j.orggeochem.2019.01.001 .

Nytoft, Hans Peter, Kildahl-Andersen, Geir, Lindström, Sofie, Rise, Frode, Bechtel, Achim, Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Stojanović, Ksenija A., "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae" in Organic Geochemistry, 129 (2019):14-23,
https://doi.org/10.1016/j.orggeochem.2019.01.001 . .

TY  - CONF
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Obradović, Marko O.
AU  - Bechtel, Achim
AU  - Stojanović, K.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3823
PB  - European Association of Geoscientists and Engineers, EAGE
C3  - 29th International Meeting on Organic Geochemistry, IMOG 2019
T1  - Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties
DO  - 10.3997/2214-4609.201902880
ER  - 

@conference{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Obradović, Marko O. and Bechtel, Achim and Stojanović, K.",
year = "2019",
publisher = "European Association of Geoscientists and Engineers, EAGE",
journal = "29th International Meeting on Organic Geochemistry, IMOG 2019",
title = "Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties",
doi = "10.3997/2214-4609.201902880"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Obradović, M. O., Bechtel, A.,& Stojanović, K.. (2019). Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties. in 29th International Meeting on Organic Geochemistry, IMOG 2019
European Association of Geoscientists and Engineers, EAGE..
https://doi.org/10.3997/2214-4609.201902880

Mitrović DD, Đoković N, Životić DR, Obradović MO, Bechtel A, Stojanović K. Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties. in 29th International Meeting on Organic Geochemistry, IMOG 2019. 2019;.
doi:10.3997/2214-4609.201902880 .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Obradović, Marko O., Bechtel, Achim, Stojanović, K., "Maceral and biomarker composition of lignite lithotypes - Implications on palaeoenvironment and grindability properties" in 29th International Meeting on Organic Geochemistry, IMOG 2019 (2019),
https://doi.org/10.3997/2214-4609.201902880 . .

TY  - JOUR
AU  - Đoković, Nataša
AU  - Mitrović, Danica D.
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Sachsenhofer, Reinhard F.
AU  - Stojanović, Ksenija A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2077
AB  - The maceral and biomarker characteristics of 4 sublithotypes of xylite-rich coal (SXCs), pale yellow, dark yellow, brown and black, originating from the Kolubara and Kostolac lignite basins were determined. Based on these results, differences in sources and changes of organic matter (OM) resulting in formation of 4 SXCs were established. Conifers (particularly Cupressaceae, Taxodiaceae and Pinacea) had a significant impact on the precursor OM of all SXCs. The contribution of gymnosperm vs. angiosperm vegetation decreased in order pale yellow SXC  gt  dark yellow SXC  gt  brown SXC  gt  black SXC. The distribution of non-hopanoid triterpenoids indicates that change of SXC colour from -yellow to black is associated with reduced input of angiosperm plants from the Betulacea family. Differences in hopane distribution, bitumen content, proportion of short-chain n-alkanes and degree of aromatization of di-and triterpenoids of pale yellow SXC are controlled by microbial communities which took part in the diagenetic alteration of OM. The content of total huminites increased from black to pale yellow SXC, whereas contents of total liptinite and inertinite macerals showed the opposite trend. SXCs differ according to textinite/ulminite ratio, which sharply decreased from pale yellow to black SXC, reflecting increase in gelification of woody tissue. Regarding the composition of liptinite macerals, the SXCs mostly differ according to resinite/liptodetrinite and resinite/suberinite ratios, which are higher in yellow than in brown and black SXC. This result along with values of TOC/N ratio and Carbon Preference Index indicate that the contribution of well preserved woody material, including lignin tissue vs. the impact of epicuticular waxes decreased from yellow to black SXC.
PB  - Slovak Acad Sciences Geological  Inst, Bratislava
T2  - Geologica Carpathica
T1  - Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia)
VL  - 69
IS  - 1
SP  - 51
EP  - 70
DO  - 10.1515/geoca-2018-0004
ER  - 

@article{
author = "Đoković, Nataša and Mitrović, Danica D. and Životić, Dragana R. and Bechtel, Achim and Sachsenhofer, Reinhard F. and Stojanović, Ksenija A.",
year = "2018",
abstract = "The maceral and biomarker characteristics of 4 sublithotypes of xylite-rich coal (SXCs), pale yellow, dark yellow, brown and black, originating from the Kolubara and Kostolac lignite basins were determined. Based on these results, differences in sources and changes of organic matter (OM) resulting in formation of 4 SXCs were established. Conifers (particularly Cupressaceae, Taxodiaceae and Pinacea) had a significant impact on the precursor OM of all SXCs. The contribution of gymnosperm vs. angiosperm vegetation decreased in order pale yellow SXC  gt  dark yellow SXC  gt  brown SXC  gt  black SXC. The distribution of non-hopanoid triterpenoids indicates that change of SXC colour from -yellow to black is associated with reduced input of angiosperm plants from the Betulacea family. Differences in hopane distribution, bitumen content, proportion of short-chain n-alkanes and degree of aromatization of di-and triterpenoids of pale yellow SXC are controlled by microbial communities which took part in the diagenetic alteration of OM. The content of total huminites increased from black to pale yellow SXC, whereas contents of total liptinite and inertinite macerals showed the opposite trend. SXCs differ according to textinite/ulminite ratio, which sharply decreased from pale yellow to black SXC, reflecting increase in gelification of woody tissue. Regarding the composition of liptinite macerals, the SXCs mostly differ according to resinite/liptodetrinite and resinite/suberinite ratios, which are higher in yellow than in brown and black SXC. This result along with values of TOC/N ratio and Carbon Preference Index indicate that the contribution of well preserved woody material, including lignin tissue vs. the impact of epicuticular waxes decreased from yellow to black SXC.",
publisher = "Slovak Acad Sciences Geological  Inst, Bratislava",
journal = "Geologica Carpathica",
title = "Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia)",
volume = "69",
number = "1",
pages = "51-70",
doi = "10.1515/geoca-2018-0004"
}

Đoković, N., Mitrović, D. D., Životić, D. R., Bechtel, A., Sachsenhofer, R. F.,& Stojanović, K. A.. (2018). Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia). in Geologica Carpathica
Slovak Acad Sciences Geological  Inst, Bratislava., 69(1), 51-70.
https://doi.org/10.1515/geoca-2018-0004

Đoković N, Mitrović DD, Životić DR, Bechtel A, Sachsenhofer RF, Stojanović KA. Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia). in Geologica Carpathica. 2018;69(1):51-70.
doi:10.1515/geoca-2018-0004 .

Đoković, Nataša, Mitrović, Danica D., Životić, Dragana R., Bechtel, Achim, Sachsenhofer, Reinhard F., Stojanović, Ksenija A., "Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia)" in Geologica Carpathica, 69, no. 1 (2018):51-70,
https://doi.org/10.1515/geoca-2018-0004 . .

TY  - JOUR
AU  - Đoković, Nataša
AU  - Mitrović, Danica D.
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Sachsenhofer, Reinhard F.
AU  - Matic, Vesna
AU  - Glamocanin, Lidija
AU  - Stojanović, Ksenija A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2195
AB  - Three Upper Miocene (Pontian) lignite seams are present in the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The origin of their organic matter (OM), the characteristics of the depositional environment and certain utilisation properties have been evaluated based on petrographic data, bulk organic geochemical parameters, biomarker patterns and their isotope signatures. Moreover, results of isotopic analysis were used for the investigation of the influence of diagenetic aromatisation on delta C-13 signatures of biomarkers. The studied lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with a strong prevalence of the former. The peat-forming vegetation is dominated by decay resistant conifers, including gymnosperm families Cupressaceae, Taxodiaceae, and Pinaceae. Angiosperms occurred in lower amounts. Minor contribution of ferns, fungi and emergent aquatic macrophyta to the biomass is also evident. Chemoautotrophic- and heterotrophic bacteria played an import role during diagenesis. Diagenetic alterations, associated with change in the number of carbon atoms, influence delta C-13 ratios. Diagenetic aromatisation of di- and non-hopanoid triterpenoids is accompanied with C-13 depletion, whereas aromatisation of hopanoids displays the opposite trend. Peatification proceeded in a fresh water environment under variable, anoxic to slightly oxic redox conditions. The lowermost coal seam III accumulated in a topogenous fresh water peat mire with open water areas, which changed occasionally into a wet forest swamp. This resulted in the deposition of mineral-rich coal. The characteristics of lignite in coal seam II are similar to those of coal seam III. This is supported also by generally similar delta C-13 values of individual biomarkers. Coal seam I is dominated by xylite-rich coal, formed under mesotrophic to ombrotrophic conditions. Rapid flooding of the bogs stopped peat growth in all three coal seams. The ratios of ring-A-degraded and non-degraded aromatic diterpenoids and non-hopanoid triterpenoids, proposed in this study, as well as degree of aromatisation of these biomarkers, reflect changes in the water table. Calorific values of the samples indicate that they meet basic requirements for utilisation in the thermal power plants. None of the lignite samples is suitable for coal briquetting, whereas, based on petrographic data, lignite from coal seam I possesses certain potential for fluidized bed gasification.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)
VL  - 195
SP  - 139
EP  - 171
DO  - 10.1016/j.coal.2018.06.005
ER  - 

@article{
author = "Đoković, Nataša and Mitrović, Danica D. and Životić, Dragana R. and Bechtel, Achim and Sachsenhofer, Reinhard F. and Matic, Vesna and Glamocanin, Lidija and Stojanović, Ksenija A.",
year = "2018",
abstract = "Three Upper Miocene (Pontian) lignite seams are present in the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The origin of their organic matter (OM), the characteristics of the depositional environment and certain utilisation properties have been evaluated based on petrographic data, bulk organic geochemical parameters, biomarker patterns and their isotope signatures. Moreover, results of isotopic analysis were used for the investigation of the influence of diagenetic aromatisation on delta C-13 signatures of biomarkers. The studied lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with a strong prevalence of the former. The peat-forming vegetation is dominated by decay resistant conifers, including gymnosperm families Cupressaceae, Taxodiaceae, and Pinaceae. Angiosperms occurred in lower amounts. Minor contribution of ferns, fungi and emergent aquatic macrophyta to the biomass is also evident. Chemoautotrophic- and heterotrophic bacteria played an import role during diagenesis. Diagenetic alterations, associated with change in the number of carbon atoms, influence delta C-13 ratios. Diagenetic aromatisation of di- and non-hopanoid triterpenoids is accompanied with C-13 depletion, whereas aromatisation of hopanoids displays the opposite trend. Peatification proceeded in a fresh water environment under variable, anoxic to slightly oxic redox conditions. The lowermost coal seam III accumulated in a topogenous fresh water peat mire with open water areas, which changed occasionally into a wet forest swamp. This resulted in the deposition of mineral-rich coal. The characteristics of lignite in coal seam II are similar to those of coal seam III. This is supported also by generally similar delta C-13 values of individual biomarkers. Coal seam I is dominated by xylite-rich coal, formed under mesotrophic to ombrotrophic conditions. Rapid flooding of the bogs stopped peat growth in all three coal seams. The ratios of ring-A-degraded and non-degraded aromatic diterpenoids and non-hopanoid triterpenoids, proposed in this study, as well as degree of aromatisation of these biomarkers, reflect changes in the water table. Calorific values of the samples indicate that they meet basic requirements for utilisation in the thermal power plants. None of the lignite samples is suitable for coal briquetting, whereas, based on petrographic data, lignite from coal seam I possesses certain potential for fluidized bed gasification.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)",
volume = "195",
pages = "139-171",
doi = "10.1016/j.coal.2018.06.005"
}

Đoković, N., Mitrović, D. D., Životić, D. R., Bechtel, A., Sachsenhofer, R. F., Matic, V., Glamocanin, L.,& Stojanović, K. A.. (2018). Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 195, 139-171.
https://doi.org/10.1016/j.coal.2018.06.005

Đoković N, Mitrović DD, Životić DR, Bechtel A, Sachsenhofer RF, Matic V, Glamocanin L, Stojanović KA. Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). in International Journal of Coal Geology. 2018;195:139-171.
doi:10.1016/j.coal.2018.06.005 .

Đoković, Nataša, Mitrović, Danica D., Životić, Dragana R., Bechtel, Achim, Sachsenhofer, Reinhard F., Matic, Vesna, Glamocanin, Lidija, Stojanović, Ksenija A., "Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)" in International Journal of Coal Geology, 195 (2018):139-171,
https://doi.org/10.1016/j.coal.2018.06.005 . .

TY  - JOUR
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Cvetković, Olga
AU  - Stojanović, Ksenija A.
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2510
AB  - Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (delta C-13) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on delta C-13 signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal  gt  matrix coal  gt  mixture of matrix and xylite-rich coal  gt  mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis
VL  - 82
IS  - 6
SP  - 739
EP  - 754
DO  - 10.2298/JSC161122030M
ER  - 

@article{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Bechtel, Achim and Cvetković, Olga and Stojanović, Ksenija A.",
year = "2017",
abstract = "Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (delta C-13) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on delta C-13 signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal  gt  matrix coal  gt  mixture of matrix and xylite-rich coal  gt  mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis",
volume = "82",
number = "6",
pages = "739-754",
doi = "10.2298/JSC161122030M"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Bechtel, A., Cvetković, O.,& Stojanović, K. A.. (2017). Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 82(6), 739-754.
https://doi.org/10.2298/JSC161122030M

Mitrović DD, Đoković N, Životić DR, Bechtel A, Cvetković O, Stojanović KA. Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis. in Journal of the Serbian Chemical Society. 2017;82(6):739-754.
doi:10.2298/JSC161122030M .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Bechtel, Achim, Cvetković, Olga, Stojanović, Ksenija A., "Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis" in Journal of the Serbian Chemical Society, 82, no. 6 (2017):739-754,
https://doi.org/10.2298/JSC161122030M . .

TY  - JOUR
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija A.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2372
AB  - The origin of the organic matter (OM) and the characteristics of the depositional environment of lignites from the Upper Miocene Kovin deposit (hosting three coal seams) of Serbia were evaluated based on petrographic data, bulk organic geochemical parameters, biomarker analysis and stable isotope geochemistry (delta C-13 of individual biomarkers). Samples were collected from four boreholes, GD-601 and GD-603 (the "A" field), and KB-79 and KB-91 (the "B" field), representing different parts of coal seams I, II, and III. Investigated lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with prevalence of the former in most samples. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by a low amount of angiosperms. Lignite forming plants mostly belonged to the gymnosperm families Cupressaceae, Taxodiaceae, Phyllocladaceae and Pinaceae. Slight input of ferns, fungi and aquatic macrophyta to lignite OM is also evident. Distributions of hopanoids and isotopic compositions of these biomarkers reflect the activity of various microbial populations represented by methanotrophic-, chemoautotrophic- and heterotrophic bacteria during diagenesis. Prominent C-28 28,30-bisnorneohop-13(18)-ene was observed for the first time in the lignite extracts. According to the delta C-13 value it was probably derived from chemoautotrophic bacteria. C28 28,30-bisnorneohop-13(18)-ene could be one of the possible precursors of a series of orphan aromatic hopanoids bearing an ethyl group at C-21, via progressive aromatization. Peatification proceeded in a fresh water environment under variable redox conditions, from anoxic to slightly oxic. All three coal seams are heterogeneous. The lower parts of the coal seams represent a topogenous fresh water peat mire with open water areas, which was subjected to inundations. The upper parts of coal seams represent a wet forest swamp with relatively stable conditions. Despite the observed variations in all three coal seams, the mean values of petrographic and organic geochemical parameters suggest general increasing of wetness and establishment of more stable conditions from seam III to seam I. Maceral and biomarker data indicate that rapid flooding of the bogs stopped peat growth in all three coal seams. Relatively frequent variations in all three coal seams, followed by repetition of lignite characteristics depict well the pronounced seasonality e.g. short term cycles of the climate during Late Miocene in investigated area. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia
VL  - 168
SP  - 80
EP  - 107
DO  - 10.1016/j.coal.2016.07.008
ER  - 

@article{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Bechtel, Achim and Šajnović, Aleksandra and Stojanović, Ksenija A.",
year = "2016",
abstract = "The origin of the organic matter (OM) and the characteristics of the depositional environment of lignites from the Upper Miocene Kovin deposit (hosting three coal seams) of Serbia were evaluated based on petrographic data, bulk organic geochemical parameters, biomarker analysis and stable isotope geochemistry (delta C-13 of individual biomarkers). Samples were collected from four boreholes, GD-601 and GD-603 (the "A" field), and KB-79 and KB-91 (the "B" field), representing different parts of coal seams I, II, and III. Investigated lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with prevalence of the former in most samples. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by a low amount of angiosperms. Lignite forming plants mostly belonged to the gymnosperm families Cupressaceae, Taxodiaceae, Phyllocladaceae and Pinaceae. Slight input of ferns, fungi and aquatic macrophyta to lignite OM is also evident. Distributions of hopanoids and isotopic compositions of these biomarkers reflect the activity of various microbial populations represented by methanotrophic-, chemoautotrophic- and heterotrophic bacteria during diagenesis. Prominent C-28 28,30-bisnorneohop-13(18)-ene was observed for the first time in the lignite extracts. According to the delta C-13 value it was probably derived from chemoautotrophic bacteria. C28 28,30-bisnorneohop-13(18)-ene could be one of the possible precursors of a series of orphan aromatic hopanoids bearing an ethyl group at C-21, via progressive aromatization. Peatification proceeded in a fresh water environment under variable redox conditions, from anoxic to slightly oxic. All three coal seams are heterogeneous. The lower parts of the coal seams represent a topogenous fresh water peat mire with open water areas, which was subjected to inundations. The upper parts of coal seams represent a wet forest swamp with relatively stable conditions. Despite the observed variations in all three coal seams, the mean values of petrographic and organic geochemical parameters suggest general increasing of wetness and establishment of more stable conditions from seam III to seam I. Maceral and biomarker data indicate that rapid flooding of the bogs stopped peat growth in all three coal seams. Relatively frequent variations in all three coal seams, followed by repetition of lignite characteristics depict well the pronounced seasonality e.g. short term cycles of the climate during Late Miocene in investigated area. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia",
volume = "168",
pages = "80-107",
doi = "10.1016/j.coal.2016.07.008"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Bechtel, A., Šajnović, A.,& Stojanović, K. A.. (2016). Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 168, 80-107.
https://doi.org/10.1016/j.coal.2016.07.008

Mitrović DD, Đoković N, Životić DR, Bechtel A, Šajnović A, Stojanović KA. Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. in International Journal of Coal Geology. 2016;168:80-107.
doi:10.1016/j.coal.2016.07.008 .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Bechtel, Achim, Šajnović, Aleksandra, Stojanović, Ksenija A., "Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia" in International Journal of Coal Geology, 168 (2016):80-107,
https://doi.org/10.1016/j.coal.2016.07.008 . .

TY  - JOUR
AU  - Vuković, Nikola S.
AU  - Životić, Dragana R.
AU  - Mendonca Filho, Joao Graciano
AU  - Kravić-Stevović, Tamara
AU  - Hamor-Vido, Maria
AU  - Mendonca, Joalice de Oliveira
AU  - Stojanović, Ksenija A.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2062
AB  - The artificial maturation changes of the humic coal organic matter (OM) from late diagenesis to the semianthracite stage of coalification were investigated using the closed-system pyrolysis. Two extracted coal samples, a subbituminous coal 26C (with a random vitrinite reflectance Rr = 0.42%) and a high volatile bituminous coal 30C (Rr = 0.56%), were pyrolysed during 4 hat two different temperatures, 250 degrees C and 400 degrees C. The applied petrographic and organic geochemical analyses showed that the humic coal OM is sensitive to the artificial thermal stress. A good correlation between the changes in petrographic characteristics and the derived liquid products was observed. The contents of all vitrinite macerals, as well as total vitrinite, increased during the thermal maturation. The abundance of liptinite macerals decreased during the maturation and they practically disappeared after 4 h of the pyrolysis at 400 degrees C. The total inertinite contents increased after the pyrolysis at 250 degrees C, yet to be decreased after the pyrolysis at 400 degrees C. The content of organic carbon increased from coals to the solid residues at 400 degrees C, whereas the contents of total hydrogen and sulphur decreased. The yields of gases, liquid products and solid residues at respective temperatures were very similar for both coals, regardless of the rank. As expected, the pyrolysis at 400 degrees C gave higher gas and liquid yields than at 250 degrees C. Regarding the liquid pyrolysates, more pronounced changes were observed in the distribution of aromatic compounds than in saturated biomarkers. The distributions of the aromatics indicate that apart from cracking and isomerisation (the formation of thermodynamically more stable isomers), the reactions of dehydrocyclization, condensation (the formation of more stable conjugated systems) and aromatization, as well as reactions involving H2S, elemental sulphur and reactive phenyl radicals released during the pyrolysis, also play an important role. It was shown that bentonitic clay plays a more important role in the subsequent aromatization of the OM than the initial maturity of the coal OM. n-Alkane parameters were useful at lower maturities (up to similar to 0.75% Rr), whereas sterane, naphthalene and phenanthrene maturity ratios are applicable at higher maturities ( gt 0.75% Rr). Hopane parameters showed variable sensitivities over the investigated maturity range (0.5-1.8% Rr). The most sensitive maturity parameters in the wide range of the humic OM maturity (0.5-1.8% Rr) are vitrinite reflectance, phenylnaphthalene ratio, methylchrysene index 2 and a parameter proposed in this study, based on the distribution of methylfluorenes (MF): (2- + 3-MF) / (1- + 4-MF). Generally, maturity parameters based solely on the isomerisation reactions of alkylaromatics, which do not include alkylation/dealkylation processes, are more appropriate for the humic OM, particularly at higher maturities. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - The assessment of maturation changes of humic coal organic matter - Insights from closed-system pyrolysis experiments
VL  - 154
SP  - 213
EP  - 239
DO  - 10.1016/j.coal.2016.01.007
ER  - 

@article{
author = "Vuković, Nikola S. and Životić, Dragana R. and Mendonca Filho, Joao Graciano and Kravić-Stevović, Tamara and Hamor-Vido, Maria and Mendonca, Joalice de Oliveira and Stojanović, Ksenija A.",
year = "2016",
abstract = "The artificial maturation changes of the humic coal organic matter (OM) from late diagenesis to the semianthracite stage of coalification were investigated using the closed-system pyrolysis. Two extracted coal samples, a subbituminous coal 26C (with a random vitrinite reflectance Rr = 0.42%) and a high volatile bituminous coal 30C (Rr = 0.56%), were pyrolysed during 4 hat two different temperatures, 250 degrees C and 400 degrees C. The applied petrographic and organic geochemical analyses showed that the humic coal OM is sensitive to the artificial thermal stress. A good correlation between the changes in petrographic characteristics and the derived liquid products was observed. The contents of all vitrinite macerals, as well as total vitrinite, increased during the thermal maturation. The abundance of liptinite macerals decreased during the maturation and they practically disappeared after 4 h of the pyrolysis at 400 degrees C. The total inertinite contents increased after the pyrolysis at 250 degrees C, yet to be decreased after the pyrolysis at 400 degrees C. The content of organic carbon increased from coals to the solid residues at 400 degrees C, whereas the contents of total hydrogen and sulphur decreased. The yields of gases, liquid products and solid residues at respective temperatures were very similar for both coals, regardless of the rank. As expected, the pyrolysis at 400 degrees C gave higher gas and liquid yields than at 250 degrees C. Regarding the liquid pyrolysates, more pronounced changes were observed in the distribution of aromatic compounds than in saturated biomarkers. The distributions of the aromatics indicate that apart from cracking and isomerisation (the formation of thermodynamically more stable isomers), the reactions of dehydrocyclization, condensation (the formation of more stable conjugated systems) and aromatization, as well as reactions involving H2S, elemental sulphur and reactive phenyl radicals released during the pyrolysis, also play an important role. It was shown that bentonitic clay plays a more important role in the subsequent aromatization of the OM than the initial maturity of the coal OM. n-Alkane parameters were useful at lower maturities (up to similar to 0.75% Rr), whereas sterane, naphthalene and phenanthrene maturity ratios are applicable at higher maturities ( gt 0.75% Rr). Hopane parameters showed variable sensitivities over the investigated maturity range (0.5-1.8% Rr). The most sensitive maturity parameters in the wide range of the humic OM maturity (0.5-1.8% Rr) are vitrinite reflectance, phenylnaphthalene ratio, methylchrysene index 2 and a parameter proposed in this study, based on the distribution of methylfluorenes (MF): (2- + 3-MF) / (1- + 4-MF). Generally, maturity parameters based solely on the isomerisation reactions of alkylaromatics, which do not include alkylation/dealkylation processes, are more appropriate for the humic OM, particularly at higher maturities. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "The assessment of maturation changes of humic coal organic matter - Insights from closed-system pyrolysis experiments",
volume = "154",
pages = "213-239",
doi = "10.1016/j.coal.2016.01.007"
}

Vuković, N. S., Životić, D. R., Mendonca Filho, J. G., Kravić-Stevović, T., Hamor-Vido, M., Mendonca, J. d. O.,& Stojanović, K. A.. (2016). The assessment of maturation changes of humic coal organic matter - Insights from closed-system pyrolysis experiments. in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 154, 213-239.
https://doi.org/10.1016/j.coal.2016.01.007

Vuković NS, Životić DR, Mendonca Filho JG, Kravić-Stevović T, Hamor-Vido M, Mendonca JDO, Stojanović KA. The assessment of maturation changes of humic coal organic matter - Insights from closed-system pyrolysis experiments. in International Journal of Coal Geology. 2016;154:213-239.
doi:10.1016/j.coal.2016.01.007 .

Vuković, Nikola S., Životić, Dragana R., Mendonca Filho, Joao Graciano, Kravić-Stevović, Tamara, Hamor-Vido, Maria, Mendonca, Joalice de Oliveira, Stojanović, Ksenija A., "The assessment of maturation changes of humic coal organic matter - Insights from closed-system pyrolysis experiments" in International Journal of Coal Geology, 154 (2016):213-239,
https://doi.org/10.1016/j.coal.2016.01.007 . .

TY  - JOUR
AU  - Nytoft, Hans Peter
AU  - Vuković, Nikola S.
AU  - Kildahl-Andersen, Geir
AU  - Rise, Frode
AU  - Životić, Dragana R.
AU  - Stojanović, Ksenija A.
PY  - 2016
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2283
AB  - series of novel C-33-C-35 hexacyclic benzohopanes (C(33)b-C(35)b) were identified in 39 samples of coal extracts and 39 crude oils of different ages from all over the world. C(33)b and C(34)b homologues were isolated, and their structures were determined by nuclear magnetic resonance. The structure of C(35)b benzohopane was proposed based on the mass spectrum and its similarity with the mass spectra of structurally defined C(33)b and C(34)b homologues. The structures of the C(33)b-C(35)b hexacyclic benzohopanes are closely related to isohopanes; both groups are typical for terrestrial organic matter and can be useful in the correlation analysis. A possible pathway of formation of these novel benzohopanes and their hopanoid precursors with an additional branch in the aliphatic side chain is proposed. C(33)b-C(35)b hexacyclic benzohopanes are stable up to the maturity level corresponding to random vitrinite reflectance (Rr) of similar to 0.80%, which was demonstrated by analyzing the samples of different maturity and by the maturation simulation experiments: hydrous pyrolysis of two bituminous coals (Rr = 0.55 and 0.59%) and pyrolysis of an extracted bituminous coal (Rr = 0.56%) and its asphaltenes. This represents a confirmation that the formation of these novel benzohopanes is related to specific depositional conditions and microbial activity during diagenesis. Mature samples (Rr = 0.8%) and hydrous pyrolysate of the bituminous coals (Rr  lt  0.60%) obtained at 330 degrees C show a distinct distribution of benzohopanes in comparison to immature and moderately mature samples, which is characterized by a low abundance of the b series benzohopanes and the presence of regular and numerous other benzohopane isomers. The latter most likely represent isomers of regular and novel benzohopanes with different substitution patterns on the aromatic ring. This isomerization of alkyl groups attached to the aromatic ring, leading to the formation of thermodynamically more stable isomers, is a well-known maturation scenario so far reported in the series of alkylated naphthalenes, phenanthrenes, and dibenzothiophenes. Therefore, in the same way, a distribution of benzohopanes can indicate thermal maturity. In addition to the novel benzohopanes, three series (2 alpha, 2 beta, and 3 beta) of their methylated derivatives were identified in numerous samples. Finally, a novel C-35 heptacyclic benzohopane with an additional cyclopentane ring was also observed in the studied samples, and its structure was tentatively identified based on the mass spectrum. Opposite to the hexacyclic C(33)b-C(35)b benzohopanes, the formation of the C-35 heptacyclic benzohopane does not require a specific hopanoid precursor with two branches in the side chain. Therefore, this compound seems to have less geochemical significance than the new hexacyclic benzohopanes.
PB  - Amer Chemical Soc, Washington
T2  - Energy and Fuels
T1  - Identification of a Novel Series of Benzohopanes and Their Geochemical Significance
VL  - 30
IS  - 7
SP  - 5563
EP  - 5575
DO  - 10.1021/acs.energyfuels.6b00799
ER  - 

@article{
author = "Nytoft, Hans Peter and Vuković, Nikola S. and Kildahl-Andersen, Geir and Rise, Frode and Životić, Dragana R. and Stojanović, Ksenija A.",
year = "2016",
abstract = "series of novel C-33-C-35 hexacyclic benzohopanes (C(33)b-C(35)b) were identified in 39 samples of coal extracts and 39 crude oils of different ages from all over the world. C(33)b and C(34)b homologues were isolated, and their structures were determined by nuclear magnetic resonance. The structure of C(35)b benzohopane was proposed based on the mass spectrum and its similarity with the mass spectra of structurally defined C(33)b and C(34)b homologues. The structures of the C(33)b-C(35)b hexacyclic benzohopanes are closely related to isohopanes; both groups are typical for terrestrial organic matter and can be useful in the correlation analysis. A possible pathway of formation of these novel benzohopanes and their hopanoid precursors with an additional branch in the aliphatic side chain is proposed. C(33)b-C(35)b hexacyclic benzohopanes are stable up to the maturity level corresponding to random vitrinite reflectance (Rr) of similar to 0.80%, which was demonstrated by analyzing the samples of different maturity and by the maturation simulation experiments: hydrous pyrolysis of two bituminous coals (Rr = 0.55 and 0.59%) and pyrolysis of an extracted bituminous coal (Rr = 0.56%) and its asphaltenes. This represents a confirmation that the formation of these novel benzohopanes is related to specific depositional conditions and microbial activity during diagenesis. Mature samples (Rr = 0.8%) and hydrous pyrolysate of the bituminous coals (Rr  lt  0.60%) obtained at 330 degrees C show a distinct distribution of benzohopanes in comparison to immature and moderately mature samples, which is characterized by a low abundance of the b series benzohopanes and the presence of regular and numerous other benzohopane isomers. The latter most likely represent isomers of regular and novel benzohopanes with different substitution patterns on the aromatic ring. This isomerization of alkyl groups attached to the aromatic ring, leading to the formation of thermodynamically more stable isomers, is a well-known maturation scenario so far reported in the series of alkylated naphthalenes, phenanthrenes, and dibenzothiophenes. Therefore, in the same way, a distribution of benzohopanes can indicate thermal maturity. In addition to the novel benzohopanes, three series (2 alpha, 2 beta, and 3 beta) of their methylated derivatives were identified in numerous samples. Finally, a novel C-35 heptacyclic benzohopane with an additional cyclopentane ring was also observed in the studied samples, and its structure was tentatively identified based on the mass spectrum. Opposite to the hexacyclic C(33)b-C(35)b benzohopanes, the formation of the C-35 heptacyclic benzohopane does not require a specific hopanoid precursor with two branches in the side chain. Therefore, this compound seems to have less geochemical significance than the new hexacyclic benzohopanes.",
publisher = "Amer Chemical Soc, Washington",
journal = "Energy and Fuels",
title = "Identification of a Novel Series of Benzohopanes and Their Geochemical Significance",
volume = "30",
number = "7",
pages = "5563-5575",
doi = "10.1021/acs.energyfuels.6b00799"
}

Nytoft, H. P., Vuković, N. S., Kildahl-Andersen, G., Rise, F., Životić, D. R.,& Stojanović, K. A.. (2016). Identification of a Novel Series of Benzohopanes and Their Geochemical Significance. in Energy and Fuels
Amer Chemical Soc, Washington., 30(7), 5563-5575.
https://doi.org/10.1021/acs.energyfuels.6b00799

Nytoft HP, Vuković NS, Kildahl-Andersen G, Rise F, Životić DR, Stojanović KA. Identification of a Novel Series of Benzohopanes and Their Geochemical Significance. in Energy and Fuels. 2016;30(7):5563-5575.
doi:10.1021/acs.energyfuels.6b00799 .

Nytoft, Hans Peter, Vuković, Nikola S., Kildahl-Andersen, Geir, Rise, Frode, Životić, Dragana R., Stojanović, Ksenija A., "Identification of a Novel Series of Benzohopanes and Their Geochemical Significance" in Energy and Fuels, 30, no. 7 (2016):5563-5575,
https://doi.org/10.1021/acs.energyfuels.6b00799 . .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Sachsenhofer, Rainhard
AU  - Gratzer, Rainhard
AU  - Radic, Dejan
AU  - Obradović, Marko
AU  - Stojanović, Ksenija A.
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1710
AB  - The influence of different coal lithotypes on grindability has been investigated using lignite from two of the most important Upper Miocene lignite basins in Serbia (Kolubara and Kostolac). Yellow xylite-rich types demonstrated the most negative impact on Hardgrove Grindability Index (HGI). All different types of xylite-rich coal, as well as total xylite-rich coal from the Kolubara basin have a negative influence on the grindability properties, while only the yellow type of xylite-rich coal from the Kostolac showed a negative impact on HGI. Matrix coal does not show a clear effect on HGI. A negative correlation between textinite content and HGI is observed in both basins, whereas contents of other macerals do not show influence on grindability properties. Content of total organic carbon demonstrated the negative impact on HGI. Correlation analysis indicates that the negative impact of the yellow type of xylite-rich coal and the sum of total xylite-rich coal on the grindability properties partly can be related to content of total organic carbon and high amount of soluble organic matter. Matrix lithotype does not show any significant correlation with bulk geochemical parameters in both basins. The peat-forming vegetation of all samples from both basins were dominated by decay-resistant gymnosperm (coniferous) plants, belonging to one or several of the families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Lignite from the Kolubara basin is characterized by a higher contribution of angiosperm vegetation than coal from the Kostolac basin. Peatification of the Kolubara coal occurred under more oxic conditions than the Kostolac one. Analysis of biomarkers indicated that the negative impact of all types of xylite-rich coal from the Kolubara on HGI can be related to the higher proportion of angiosperms, abundance of mid-chain n-alkanes and sesquiterpenoids, aromatization of non-hopanoid triterpenoids and hopanoids, and intense degradation of wood tissues in a more oxic environment. The positive impact of matrix coal on HGI in the Kolubara samples can be attributed to elevated content of non-aromatic hopanoids and low amounts of aromatic non-hopanoid triterpenoids and sesquiterpenoids, which seems to hinder the grindability properties.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index (Reprinted)
VL  - 139
SP  - 165
EP  - 183
DO  - 10.1016/j.coal.2014.10.006
ER  - 

@article{
author = "Životić, Dragana R. and Bechtel, Achim and Sachsenhofer, Rainhard and Gratzer, Rainhard and Radic, Dejan and Obradović, Marko and Stojanović, Ksenija A.",
year = "2015",
abstract = "The influence of different coal lithotypes on grindability has been investigated using lignite from two of the most important Upper Miocene lignite basins in Serbia (Kolubara and Kostolac). Yellow xylite-rich types demonstrated the most negative impact on Hardgrove Grindability Index (HGI). All different types of xylite-rich coal, as well as total xylite-rich coal from the Kolubara basin have a negative influence on the grindability properties, while only the yellow type of xylite-rich coal from the Kostolac showed a negative impact on HGI. Matrix coal does not show a clear effect on HGI. A negative correlation between textinite content and HGI is observed in both basins, whereas contents of other macerals do not show influence on grindability properties. Content of total organic carbon demonstrated the negative impact on HGI. Correlation analysis indicates that the negative impact of the yellow type of xylite-rich coal and the sum of total xylite-rich coal on the grindability properties partly can be related to content of total organic carbon and high amount of soluble organic matter. Matrix lithotype does not show any significant correlation with bulk geochemical parameters in both basins. The peat-forming vegetation of all samples from both basins were dominated by decay-resistant gymnosperm (coniferous) plants, belonging to one or several of the families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Lignite from the Kolubara basin is characterized by a higher contribution of angiosperm vegetation than coal from the Kostolac basin. Peatification of the Kolubara coal occurred under more oxic conditions than the Kostolac one. Analysis of biomarkers indicated that the negative impact of all types of xylite-rich coal from the Kolubara on HGI can be related to the higher proportion of angiosperms, abundance of mid-chain n-alkanes and sesquiterpenoids, aromatization of non-hopanoid triterpenoids and hopanoids, and intense degradation of wood tissues in a more oxic environment. The positive impact of matrix coal on HGI in the Kolubara samples can be attributed to elevated content of non-aromatic hopanoids and low amounts of aromatic non-hopanoid triterpenoids and sesquiterpenoids, which seems to hinder the grindability properties.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index (Reprinted)",
volume = "139",
pages = "165-183",
doi = "10.1016/j.coal.2014.10.006"
}

Životić, D. R., Bechtel, A., Sachsenhofer, R., Gratzer, R., Radic, D., Obradović, M.,& Stojanović, K. A.. (2015). Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index (Reprinted). in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 139, 165-183.
https://doi.org/10.1016/j.coal.2014.10.006

Životić DR, Bechtel A, Sachsenhofer R, Gratzer R, Radic D, Obradović M, Stojanović KA. Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index (Reprinted). in International Journal of Coal Geology. 2015;139:165-183.
doi:10.1016/j.coal.2014.10.006 .

Životić, Dragana R., Bechtel, Achim, Sachsenhofer, Rainhard, Gratzer, Rainhard, Radic, Dejan, Obradović, Marko, Stojanović, Ksenija A., "Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index (Reprinted)" in International Journal of Coal Geology, 139 (2015):165-183,
https://doi.org/10.1016/j.coal.2014.10.006 . .

TY  - JOUR
AU  - Đoković, Nataša
AU  - Mitrović, Danica D.
AU  - Životić, Dragana R.
AU  - Spanic, Darko
AU  - Troskot-Corbic, Tamara
AU  - Cvetković, Olga
AU  - Stojanović, Ksenija A.
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1717
AB  - The study was aimed at determining the origin and geological evolution of lignites from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The possibility of a rational utilization of the coal was also considered. For this purpose, numerous organic geochemical analyses were applied to representative lignite samples. The obtained results showed that the coal from the Smederevsko Pomoravlje field is a typical humic coal. The peat-forming vegetation was dominated by gymnosperm plants. The coal-forming plants belonged to the gymnosperm families Taxodiaceae, Cupressaceae, Phyllo-cladaceae and Pinaceae. Other precursors of organic matter (OM) were microbial biomass ferns and angiosperms. It was established that peatification occurred in a neutral to slightly acidic, fresh water environment Under anoxic to suboxic redox conditions. The maturity of the OM is low, in the phase of intense diagenetic processes. The biomarker compositions and values of the corresponding parameters revealed that the Smederevsko Pomoravlje field, the Drmno field (Kostolac Basin) and the "A" field (Kovin deposit) represent a part of a unique lignite basin. The results of this study suggest possible rational utilization of the Smederevsko Pomoravlje lignites in thermal power plants. This is particularly related to samples from coal seam I. A significant amount of gas could be generated from lignites at higher maturities. Eight samples met the basic assumptions for effective gasification.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization
VL  - 80
IS  - 4
SP  - 575
EP  - 588
DO  - 10.2298/JSC140219040D
ER  - 

@article{
author = "Đoković, Nataša and Mitrović, Danica D. and Životić, Dragana R. and Spanic, Darko and Troskot-Corbic, Tamara and Cvetković, Olga and Stojanović, Ksenija A.",
year = "2015",
abstract = "The study was aimed at determining the origin and geological evolution of lignites from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The possibility of a rational utilization of the coal was also considered. For this purpose, numerous organic geochemical analyses were applied to representative lignite samples. The obtained results showed that the coal from the Smederevsko Pomoravlje field is a typical humic coal. The peat-forming vegetation was dominated by gymnosperm plants. The coal-forming plants belonged to the gymnosperm families Taxodiaceae, Cupressaceae, Phyllo-cladaceae and Pinaceae. Other precursors of organic matter (OM) were microbial biomass ferns and angiosperms. It was established that peatification occurred in a neutral to slightly acidic, fresh water environment Under anoxic to suboxic redox conditions. The maturity of the OM is low, in the phase of intense diagenetic processes. The biomarker compositions and values of the corresponding parameters revealed that the Smederevsko Pomoravlje field, the Drmno field (Kostolac Basin) and the "A" field (Kovin deposit) represent a part of a unique lignite basin. The results of this study suggest possible rational utilization of the Smederevsko Pomoravlje lignites in thermal power plants. This is particularly related to samples from coal seam I. A significant amount of gas could be generated from lignites at higher maturities. Eight samples met the basic assumptions for effective gasification.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization",
volume = "80",
number = "4",
pages = "575-588",
doi = "10.2298/JSC140219040D"
}

Đoković, N., Mitrović, D. D., Životić, D. R., Spanic, D., Troskot-Corbic, T., Cvetković, O.,& Stojanović, K. A.. (2015). Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 80(4), 575-588.
https://doi.org/10.2298/JSC140219040D

Đoković N, Mitrović DD, Životić DR, Spanic D, Troskot-Corbic T, Cvetković O, Stojanović KA. Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization. in Journal of the Serbian Chemical Society. 2015;80(4):575-588.
doi:10.2298/JSC140219040D .

Đoković, Nataša, Mitrović, Danica D., Životić, Dragana R., Spanic, Darko, Troskot-Corbic, Tamara, Cvetković, Olga, Stojanović, Ksenija A., "Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization" in Journal of the Serbian Chemical Society, 80, no. 4 (2015):575-588,
https://doi.org/10.2298/JSC140219040D . .

TY  - CONF
AU  - Mitrović, Danica D.
AU  - Đoković, Nataša
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Stojanović, Ksenija A.
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2817
PB  - Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften (SDGG)
C3  - 67th Annual Meeting of the International Committee for Coal and Organic Petrology
T1  - Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia
UR  - https://hdl.handle.net/21.15107/rcub_cherry_2817
ER  - 

@conference{
author = "Mitrović, Danica D. and Đoković, Nataša and Životić, Dragana R. and Bechtel, Achim and Stojanović, Ksenija A.",
year = "2015",
publisher = "Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften (SDGG)",
journal = "67th Annual Meeting of the International Committee for Coal and Organic Petrology",
title = "Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia",
url = "https://hdl.handle.net/21.15107/rcub_cherry_2817"
}

Mitrović, D. D., Đoković, N., Životić, D. R., Bechtel, A.,& Stojanović, K. A.. (2015). Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia. in 67th Annual Meeting of the International Committee for Coal and Organic Petrology
Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften (SDGG)..
https://hdl.handle.net/21.15107/rcub_cherry_2817

Mitrović DD, Đoković N, Životić DR, Bechtel A, Stojanović KA. Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia. in 67th Annual Meeting of the International Committee for Coal and Organic Petrology. 2015;.
https://hdl.handle.net/21.15107/rcub_cherry_2817 .

Mitrović, Danica D., Đoković, Nataša, Životić, Dragana R., Bechtel, Achim, Stojanović, Ksenija A., "Palaeoenvironmental reconstruction of the Kovin lignite deposit, Serbia" in 67th Annual Meeting of the International Committee for Coal and Organic Petrology (2015),
https://hdl.handle.net/21.15107/rcub_cherry_2817 .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Bechtel, Achim
AU  - Sachsenhofer, Rainhard
AU  - Gratzer, Rainhard
AU  - Radic, Dejan
AU  - Obradović, Marko
AU  - Stojanović, Ksenija A.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1867
AB  - The influence of different coal lithotypes on grindability has been investigated using lignite from two of the most important Upper Miocene lignite basins in Serbia (Kolubara and Kostolac). Yellow xylite-rich types demonstrated the most negative impact on Hardgrove Grindability Index (HGI). All different types of xylite-rich coal, as well as total xylite-rich coal from the Kolubara basin have a negative influence on the grindability properties, while only the yellow type of xylite-rich coal from the Kostolac showed a negative impact on HGI. Matrix coal does not show a clear effect on HGI. A negative correlation between textinite content and HGI is observed in both basins, whereas contents of other macerals do not show influence on grindability properties. Content of total organic carbon demonstrated the negative impact on HGI. Correlation analysis indicates that the negative impact of the yellow type of xylite-rich coal and the sum of total xylite-rich coal on the grindability properties partly can be related to content of total organic carbon and high amount of soluble organic matter. Matrix lithotype does not show any significant correlation with bulk geochemical parameters in both basins. The peat-forming vegetation of all samples from both basins were dominated by decay-resistant gymnosperm (coniferous) plants, belonging to one or several of the families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Lignite from the Kolubara basin is characterized by a higher contribution of angiosperm vegetation than coal from the Kostolac basin. Peatification of the Kolubara coal occurred under more oxic conditions than the Kostolac one. Analysis of biomarkers indicated that the negative impact of all types of xylite-rich coal from the Kolubara on HGI can be related to the higher proportion of angiosperms, abundance of mid-chain n-alkanes and sesquiterpenoids, aromatization of non-hopanoid triterpenoids and hopanoids, and intense degradation of wood tissues in a more oxic environment. The positive impact of matrix coal on HGI in the Kolubara samples can be attributed to elevated content of non-aromatic hopanoids and low amounts of aromatic non-hopanoid triterpenoids and sesquiterpenoids, which seems to hinder the grindability properties. (C) 2014 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index
VL  - 131
SP  - 344
EP  - 362
DO  - 10.1016/j.coal.2014.07.004
ER  - 

@article{
author = "Životić, Dragana R. and Bechtel, Achim and Sachsenhofer, Rainhard and Gratzer, Rainhard and Radic, Dejan and Obradović, Marko and Stojanović, Ksenija A.",
year = "2014",
abstract = "The influence of different coal lithotypes on grindability has been investigated using lignite from two of the most important Upper Miocene lignite basins in Serbia (Kolubara and Kostolac). Yellow xylite-rich types demonstrated the most negative impact on Hardgrove Grindability Index (HGI). All different types of xylite-rich coal, as well as total xylite-rich coal from the Kolubara basin have a negative influence on the grindability properties, while only the yellow type of xylite-rich coal from the Kostolac showed a negative impact on HGI. Matrix coal does not show a clear effect on HGI. A negative correlation between textinite content and HGI is observed in both basins, whereas contents of other macerals do not show influence on grindability properties. Content of total organic carbon demonstrated the negative impact on HGI. Correlation analysis indicates that the negative impact of the yellow type of xylite-rich coal and the sum of total xylite-rich coal on the grindability properties partly can be related to content of total organic carbon and high amount of soluble organic matter. Matrix lithotype does not show any significant correlation with bulk geochemical parameters in both basins. The peat-forming vegetation of all samples from both basins were dominated by decay-resistant gymnosperm (coniferous) plants, belonging to one or several of the families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Lignite from the Kolubara basin is characterized by a higher contribution of angiosperm vegetation than coal from the Kostolac basin. Peatification of the Kolubara coal occurred under more oxic conditions than the Kostolac one. Analysis of biomarkers indicated that the negative impact of all types of xylite-rich coal from the Kolubara on HGI can be related to the higher proportion of angiosperms, abundance of mid-chain n-alkanes and sesquiterpenoids, aromatization of non-hopanoid triterpenoids and hopanoids, and intense degradation of wood tissues in a more oxic environment. The positive impact of matrix coal on HGI in the Kolubara samples can be attributed to elevated content of non-aromatic hopanoids and low amounts of aromatic non-hopanoid triterpenoids and sesquiterpenoids, which seems to hinder the grindability properties. (C) 2014 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index",
volume = "131",
pages = "344-362",
doi = "10.1016/j.coal.2014.07.004"
}

Životić, D. R., Bechtel, A., Sachsenhofer, R., Gratzer, R., Radic, D., Obradović, M.,& Stojanović, K. A.. (2014). Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index. in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 131, 344-362.
https://doi.org/10.1016/j.coal.2014.07.004

Životić DR, Bechtel A, Sachsenhofer R, Gratzer R, Radic D, Obradović M, Stojanović KA. Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index. in International Journal of Coal Geology. 2014;131:344-362.
doi:10.1016/j.coal.2014.07.004 .

Životić, Dragana R., Bechtel, Achim, Sachsenhofer, Rainhard, Gratzer, Rainhard, Radic, Dejan, Obradović, Marko, Stojanović, Ksenija A., "Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index" in International Journal of Coal Geology, 131 (2014):344-362,
https://doi.org/10.1016/j.coal.2014.07.004 . .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Stojanović, Ksenija A.
AU  - Gržetić, Ivan
AU  - Jovančićević, Branimir
AU  - Cvetković, Olga
AU  - Šajnović, Aleksandra
AU  - Simić, Vladimir
AU  - Stojakovic, Rajko
AU  - Scheeder, Georg
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1636
AB  - The Upper Miocene lignite from the Main coal seam in the D field, Kolubara basin, is a typical humic coal with huminite, liptinite and inertinite concentrations of up to 83.7 vol.%, 17.2 vol.% and 15.5 vol.%, respectively. In the huminite group, textinite and ulminite are the most abundant macerals with variable amounts of densinite and attrinite. Liptodetrinite and sporinite are the most common macerals of the liptinite group, while inertodetrinite is the most abundant maceral of the inertinite group. The mineral matter consists mostly of clay minerals. The main sources of organic matter were gymnosperms (conifers) and microbial biomass, followed by angiosperms. Based on composition of saturated and aromatic diterpenoids it has been established that coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification occurred in neutral to slightly acidic, fresh water environment Composition and distribution of biomarkers show that diagenetic changes of the organic matter were mainly governed by bacterial activity in a suboxic to oxic environment Based on distribution of aromatic diterpenoids a novel diagenetic pathway for transformation of abietane-type precursors under suboxic to oxic conditions is proposed. Variations in compositions of macerals and biomarkers are in concordance with pronounced seasonality during Pontian, which caused changes in the water level, redox conditions during peatification, and to some extent vegetation differences in the paleo-plant communities.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrological and geochemical composition of lignite from the D field, Kolubara basin (Serbia)
VL  - 111
SP  - 5
EP  - 22
DO  - 10.1016/j.coal.2012.10.014
ER  - 

@article{
author = "Životić, Dragana R. and Stojanović, Ksenija A. and Gržetić, Ivan and Jovančićević, Branimir and Cvetković, Olga and Šajnović, Aleksandra and Simić, Vladimir and Stojakovic, Rajko and Scheeder, Georg",
year = "2013",
abstract = "The Upper Miocene lignite from the Main coal seam in the D field, Kolubara basin, is a typical humic coal with huminite, liptinite and inertinite concentrations of up to 83.7 vol.%, 17.2 vol.% and 15.5 vol.%, respectively. In the huminite group, textinite and ulminite are the most abundant macerals with variable amounts of densinite and attrinite. Liptodetrinite and sporinite are the most common macerals of the liptinite group, while inertodetrinite is the most abundant maceral of the inertinite group. The mineral matter consists mostly of clay minerals. The main sources of organic matter were gymnosperms (conifers) and microbial biomass, followed by angiosperms. Based on composition of saturated and aromatic diterpenoids it has been established that coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification occurred in neutral to slightly acidic, fresh water environment Composition and distribution of biomarkers show that diagenetic changes of the organic matter were mainly governed by bacterial activity in a suboxic to oxic environment Based on distribution of aromatic diterpenoids a novel diagenetic pathway for transformation of abietane-type precursors under suboxic to oxic conditions is proposed. Variations in compositions of macerals and biomarkers are in concordance with pronounced seasonality during Pontian, which caused changes in the water level, redox conditions during peatification, and to some extent vegetation differences in the paleo-plant communities.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrological and geochemical composition of lignite from the D field, Kolubara basin (Serbia)",
volume = "111",
pages = "5-22",
doi = "10.1016/j.coal.2012.10.014"
}

Životić, D. R., Stojanović, K. A., Gržetić, I., Jovančićević, B., Cvetković, O., Šajnović, A., Simić, V., Stojakovic, R.,& Scheeder, G.. (2013). Petrological and geochemical composition of lignite from the D field, Kolubara basin (Serbia). in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 111, 5-22.
https://doi.org/10.1016/j.coal.2012.10.014

Životić DR, Stojanović KA, Gržetić I, Jovančićević B, Cvetković O, Šajnović A, Simić V, Stojakovic R, Scheeder G. Petrological and geochemical composition of lignite from the D field, Kolubara basin (Serbia). in International Journal of Coal Geology. 2013;111:5-22.
doi:10.1016/j.coal.2012.10.014 .

Životić, Dragana R., Stojanović, Ksenija A., Gržetić, Ivan, Jovančićević, Branimir, Cvetković, Olga, Šajnović, Aleksandra, Simić, Vladimir, Stojakovic, Rajko, Scheeder, Georg, "Petrological and geochemical composition of lignite from the D field, Kolubara basin (Serbia)" in International Journal of Coal Geology, 111 (2013):5-22,
https://doi.org/10.1016/j.coal.2012.10.014 . .

TY  - JOUR
AU  - Stojanović, Ksenija A.
AU  - Životić, Dragana R.
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1614
AB  - The origin of the organic matter (OM) and the characteristics of the paleoenvironment of Serbian brown coals covering a time-span from the Lower to the Upper Miocene were evaluated and compared based on comprehensive petrological and biomarker analyses. Investigated coals are typical humic coals. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by variable amount of angiosperms. Coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification proceeded in fresh water environment under variable Eh settings, from anoxic to slightly oxic condition. Upper Miocene lignites were formed in neutral to slightly acidic environment, whereas Lower and Middle Miocene coals were deposited under neutral to slightly alkaline, and more reductive conditions, which is the result of calcium-rich surface waters derived from the surrounding Jurassic to Cretaceous calcareous country rock and higher water column level. Diagenetic changes of the OM were governed by bacterial activity, rather than thermal alteration. Biomarker pattern does not significantly differ in Serbian coals of different ages. The main differences between Upper, Middle and Lower Miocene coals are expressed by higher Gelification Index (GI), proxy ratio (P-aq), n-C-23/(n-C-27 + n-C-31) and pimarane/16 alpha(H)-phyllodadane ratio, as well as lower relative abundance of C-31 alpha beta(R)-hopane of the latter one. OM of Lower Miocene coals is more mature, corresponding to immature/early mature stage (huminite/vitrinite reflectance similar to 0.45), whereas OM of Upper Miocene lignites is in immature diagenetic phase (huminite reflectance similar to 0.3). Consequently, higher gelification of Lower Miocene coals is probably an effect of higher rank, however high humidity/wet climate and low acidity within the mire could not be excluded. A good correlation between biomarker parameters and paleoclimate data is observed, indicating that biomarker patterns represent a valuable tool that reflect even slight paleoclimate changes in Serbia during Miocene.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Comparative study of Serbian Miocene coals - Insights from biomarker composition
VL  - 107
SP  - 3
EP  - 23
DO  - 10.1016/j.coal.2012.09.009
ER  - 

@article{
author = "Stojanović, Ksenija A. and Životić, Dragana R.",
year = "2013",
abstract = "The origin of the organic matter (OM) and the characteristics of the paleoenvironment of Serbian brown coals covering a time-span from the Lower to the Upper Miocene were evaluated and compared based on comprehensive petrological and biomarker analyses. Investigated coals are typical humic coals. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by variable amount of angiosperms. Coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification proceeded in fresh water environment under variable Eh settings, from anoxic to slightly oxic condition. Upper Miocene lignites were formed in neutral to slightly acidic environment, whereas Lower and Middle Miocene coals were deposited under neutral to slightly alkaline, and more reductive conditions, which is the result of calcium-rich surface waters derived from the surrounding Jurassic to Cretaceous calcareous country rock and higher water column level. Diagenetic changes of the OM were governed by bacterial activity, rather than thermal alteration. Biomarker pattern does not significantly differ in Serbian coals of different ages. The main differences between Upper, Middle and Lower Miocene coals are expressed by higher Gelification Index (GI), proxy ratio (P-aq), n-C-23/(n-C-27 + n-C-31) and pimarane/16 alpha(H)-phyllodadane ratio, as well as lower relative abundance of C-31 alpha beta(R)-hopane of the latter one. OM of Lower Miocene coals is more mature, corresponding to immature/early mature stage (huminite/vitrinite reflectance similar to 0.45), whereas OM of Upper Miocene lignites is in immature diagenetic phase (huminite reflectance similar to 0.3). Consequently, higher gelification of Lower Miocene coals is probably an effect of higher rank, however high humidity/wet climate and low acidity within the mire could not be excluded. A good correlation between biomarker parameters and paleoclimate data is observed, indicating that biomarker patterns represent a valuable tool that reflect even slight paleoclimate changes in Serbia during Miocene.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Comparative study of Serbian Miocene coals - Insights from biomarker composition",
volume = "107",
pages = "3-23",
doi = "10.1016/j.coal.2012.09.009"
}

Stojanović, K. A.,& Životić, D. R.. (2013). Comparative study of Serbian Miocene coals - Insights from biomarker composition. in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 107, 3-23.
https://doi.org/10.1016/j.coal.2012.09.009

Stojanović KA, Životić DR. Comparative study of Serbian Miocene coals - Insights from biomarker composition. in International Journal of Coal Geology. 2013;107:3-23.
doi:10.1016/j.coal.2012.09.009 .

Stojanović, Ksenija A., Životić, Dragana R., "Comparative study of Serbian Miocene coals - Insights from biomarker composition" in International Journal of Coal Geology, 107 (2013):3-23,
https://doi.org/10.1016/j.coal.2012.09.009 . .

TY  - JOUR
AU  - Stojanović, Ksenija A.
AU  - Životić, Dragana R.
AU  - Šajnović, Aleksandra
AU  - Cvetković, Olga
AU  - Nytoft, Hans Peter
AU  - Scheeder, Georg
PY  - 2012
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1532
AB  - The objective of the study was to determine the origin and to reconstruct the geological evolution of lignites from the Drmno field (Kostolac Basin, Serbia). For this purpose, petrological and organic geochemical analyses were used. Coal from the Drmno field is typical humic coal. Peat-forming vegetation dominated by decay of resistant gymnosperm (coniferous) plants, followed by prokaryotic organisms and angiosperms. The coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification was realised in a neutral to slightly acidic, fresh water environment. Considering that the organic matter of the Drmno lignites was deposited at the same time, in a relatively constant climate, it could be supposed that climate probably had only a small impact on peatification. Therefore, variations in compositions of macerals and biomarkers indicate changes in the water level, due to seasonal drying of the mire, which caused vegetation differences in the palaeoplant communities and changes in the redox conditions (from anoxic to slightly oxic) during peatification. Diagenetic transformations of the organic matter were mainly governed by microbial activity, rather than thermal alteration.
AB  - Cilj rada bio je da se utvrdi poreklo i geološka evolucija lignita ležišta Drmno basena Kostolac. Primenjene su petrografske i organsko geohemijske metode. Ligniti ležišta Drmno su tipični humusni ugljevi. Glavni izvor organske supstance bile su gimnosperme (golosemenice), a zatim prokariotski organizmi i angiosperme (skrivenosemenice). Utvrđeno je da prekursorski organski materijal potiče od sledećih familija gimnospermi: Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae i Pinaceae. Taloženje i humifikacija organske supstance lignita odvijali su se u slatkovodnoj, neutralnoj do slabo kiseloj sredini. Uzimajući u obzir da se stvaranje lignita u ležištu Drmno odigravalo u isto vreme, pretpostavljeno je da klimatski faktor nije mogao značajnije uticati na sastav organske supstance. Razlike u sastavu macerala i biomarkera u ispitivanim lignitima posledica su kolebanja nivoa vodenog stuba u sredini taloženja usled sezonskih promena u količini padavina. Ovo kolebanje vodenog stuba uzrokovalo je promene kako u sastavu paleovegetacije, tako i u redoks potencijalu sredine taloženja (od anoksične do blago oksične). Dijagentske promene organske supstance odvijale su se uz intenzivnu mikrobnu aktivnost, dok je termička degradacija bila gotovo beznačajna.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Drmno lignite field (Kostolac Basin, Serbia): origin and palaeoenvironmental implications from petrological and organic geochemical studies
T1  - Ligniti ležišta Drmno (basen Kostolac) - poreklo i paleouslovi stvaranja na osnovu petrografskih i organsko-geohemijskih istraživanja
VL  - 77
IS  - 8
SP  - 1109
EP  - 1127
DO  - 10.2298/JSC111126017S
ER  - 

@article{
author = "Stojanović, Ksenija A. and Životić, Dragana R. and Šajnović, Aleksandra and Cvetković, Olga and Nytoft, Hans Peter and Scheeder, Georg",
year = "2012",
abstract = "The objective of the study was to determine the origin and to reconstruct the geological evolution of lignites from the Drmno field (Kostolac Basin, Serbia). For this purpose, petrological and organic geochemical analyses were used. Coal from the Drmno field is typical humic coal. Peat-forming vegetation dominated by decay of resistant gymnosperm (coniferous) plants, followed by prokaryotic organisms and angiosperms. The coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification was realised in a neutral to slightly acidic, fresh water environment. Considering that the organic matter of the Drmno lignites was deposited at the same time, in a relatively constant climate, it could be supposed that climate probably had only a small impact on peatification. Therefore, variations in compositions of macerals and biomarkers indicate changes in the water level, due to seasonal drying of the mire, which caused vegetation differences in the palaeoplant communities and changes in the redox conditions (from anoxic to slightly oxic) during peatification. Diagenetic transformations of the organic matter were mainly governed by microbial activity, rather than thermal alteration., Cilj rada bio je da se utvrdi poreklo i geološka evolucija lignita ležišta Drmno basena Kostolac. Primenjene su petrografske i organsko geohemijske metode. Ligniti ležišta Drmno su tipični humusni ugljevi. Glavni izvor organske supstance bile su gimnosperme (golosemenice), a zatim prokariotski organizmi i angiosperme (skrivenosemenice). Utvrđeno je da prekursorski organski materijal potiče od sledećih familija gimnospermi: Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae i Pinaceae. Taloženje i humifikacija organske supstance lignita odvijali su se u slatkovodnoj, neutralnoj do slabo kiseloj sredini. Uzimajući u obzir da se stvaranje lignita u ležištu Drmno odigravalo u isto vreme, pretpostavljeno je da klimatski faktor nije mogao značajnije uticati na sastav organske supstance. Razlike u sastavu macerala i biomarkera u ispitivanim lignitima posledica su kolebanja nivoa vodenog stuba u sredini taloženja usled sezonskih promena u količini padavina. Ovo kolebanje vodenog stuba uzrokovalo je promene kako u sastavu paleovegetacije, tako i u redoks potencijalu sredine taloženja (od anoksične do blago oksične). Dijagentske promene organske supstance odvijale su se uz intenzivnu mikrobnu aktivnost, dok je termička degradacija bila gotovo beznačajna.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Drmno lignite field (Kostolac Basin, Serbia): origin and palaeoenvironmental implications from petrological and organic geochemical studies, Ligniti ležišta Drmno (basen Kostolac) - poreklo i paleouslovi stvaranja na osnovu petrografskih i organsko-geohemijskih istraživanja",
volume = "77",
number = "8",
pages = "1109-1127",
doi = "10.2298/JSC111126017S"
}

Stojanović, K. A., Životić, D. R., Šajnović, A., Cvetković, O., Nytoft, H. P.,& Scheeder, G.. (2012). Drmno lignite field (Kostolac Basin, Serbia): origin and palaeoenvironmental implications from petrological and organic geochemical studies. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 77(8), 1109-1127.
https://doi.org/10.2298/JSC111126017S

Stojanović KA, Životić DR, Šajnović A, Cvetković O, Nytoft HP, Scheeder G. Drmno lignite field (Kostolac Basin, Serbia): origin and palaeoenvironmental implications from petrological and organic geochemical studies. in Journal of the Serbian Chemical Society. 2012;77(8):1109-1127.
doi:10.2298/JSC111126017S .

Stojanović, Ksenija A., Životić, Dragana R., Šajnović, Aleksandra, Cvetković, Olga, Nytoft, Hans Peter, Scheeder, Georg, "Drmno lignite field (Kostolac Basin, Serbia): origin and palaeoenvironmental implications from petrological and organic geochemical studies" in Journal of the Serbian Chemical Society, 77, no. 8 (2012):1109-1127,
https://doi.org/10.2298/JSC111126017S . .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Jovančićević, Branimir
AU  - Schwarzbauer, Jan
AU  - Cvetković, Olga
AU  - Gržetić, Ivan
AU  - Ercegovac, Marko
AU  - Stojanović, Ksenija A.
AU  - Šajnović, Aleksandra
PY  - 2010
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1070
AB  - A petrological and organic geochemical study was performed on coal samples from the East field deposit, Bogovina Basin, Serbia. Fourteen coal samples were collected from different parts of the Main and Upper coal seams from fresh, working faces in the underground subbituminous coal mine. The Lower Miocene (?) coal of the East field is a typical humic coal with huminite, liptinite and inertinite concentrations of up to 81.4 vol.%, 16.1 vol.% and 13.5 vol.%, respectively. Densinite is the most abundant maceral with variable amounts of ulminite and gelinite. Sporinite and liptodetrinite are the most common macerals of the liptinite group. Exsudatinite was detected in the lower part of the Lower coal seam. Inertodetrinite is the most abundant maceral of the inertinite group. The mineral matter consists mostly of clay minerals and carbonates. The mean random huminite reflectance (ulminite B) for the Main coal seam is 0.42 +/- 0.04%Rr, and 0.41 +/- 0.04%Rr for the Upper coal seam, which are typical for an immature to early mature stage of the organic matter. The distribution and abundance of n-alkanes and steranes indicates a significant contribution of epicuticular waxes from higher plants. High amount of phyllocladane-type diterpenoids (16 alpha(H)-phyllocladane) suggests that coal forming plants were conifer families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Sciadopityaceae, and Phyllocladaceae, while a higher amount of pimarane and norpimarane suggests Pinaceae. Taxodiaceae, and Cupressaceae. The pristane/phytane (Pr/Ph) ratio implies variable anaerobic to oxic conditions during sedimentation. The distribution of the hopanes detected in the Bogovina East field coal indicates an immature to early mature stage of the organic matter, which is in agreement with huminite reflectance. The high coal sulphur contents from the East field are characteristic for slightly alkaline depositional environments generated by bentonite from the basement of the Main coal seam. The petrological observation and biomarker composition provide evidence for the generation of immature hydrocarbons which, most probably, originated from the resins and waxes of higher plants, mostly gymnosperms. (C) 2009 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - The petrographical and organic geochemical composition of coal from the East field, Bogovina Basin (Serbia)
VL  - 81
IS  - 4
SP  - 227
EP  - 241
DO  - 10.1016/j.coal.2009.07.012
ER  - 

@article{
author = "Životić, Dragana R. and Jovančićević, Branimir and Schwarzbauer, Jan and Cvetković, Olga and Gržetić, Ivan and Ercegovac, Marko and Stojanović, Ksenija A. and Šajnović, Aleksandra",
year = "2010",
abstract = "A petrological and organic geochemical study was performed on coal samples from the East field deposit, Bogovina Basin, Serbia. Fourteen coal samples were collected from different parts of the Main and Upper coal seams from fresh, working faces in the underground subbituminous coal mine. The Lower Miocene (?) coal of the East field is a typical humic coal with huminite, liptinite and inertinite concentrations of up to 81.4 vol.%, 16.1 vol.% and 13.5 vol.%, respectively. Densinite is the most abundant maceral with variable amounts of ulminite and gelinite. Sporinite and liptodetrinite are the most common macerals of the liptinite group. Exsudatinite was detected in the lower part of the Lower coal seam. Inertodetrinite is the most abundant maceral of the inertinite group. The mineral matter consists mostly of clay minerals and carbonates. The mean random huminite reflectance (ulminite B) for the Main coal seam is 0.42 +/- 0.04%Rr, and 0.41 +/- 0.04%Rr for the Upper coal seam, which are typical for an immature to early mature stage of the organic matter. The distribution and abundance of n-alkanes and steranes indicates a significant contribution of epicuticular waxes from higher plants. High amount of phyllocladane-type diterpenoids (16 alpha(H)-phyllocladane) suggests that coal forming plants were conifer families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Sciadopityaceae, and Phyllocladaceae, while a higher amount of pimarane and norpimarane suggests Pinaceae. Taxodiaceae, and Cupressaceae. The pristane/phytane (Pr/Ph) ratio implies variable anaerobic to oxic conditions during sedimentation. The distribution of the hopanes detected in the Bogovina East field coal indicates an immature to early mature stage of the organic matter, which is in agreement with huminite reflectance. The high coal sulphur contents from the East field are characteristic for slightly alkaline depositional environments generated by bentonite from the basement of the Main coal seam. The petrological observation and biomarker composition provide evidence for the generation of immature hydrocarbons which, most probably, originated from the resins and waxes of higher plants, mostly gymnosperms. (C) 2009 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "The petrographical and organic geochemical composition of coal from the East field, Bogovina Basin (Serbia)",
volume = "81",
number = "4",
pages = "227-241",
doi = "10.1016/j.coal.2009.07.012"
}

Životić, D. R., Jovančićević, B., Schwarzbauer, J., Cvetković, O., Gržetić, I., Ercegovac, M., Stojanović, K. A.,& Šajnović, A.. (2010). The petrographical and organic geochemical composition of coal from the East field, Bogovina Basin (Serbia). in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 81(4), 227-241.
https://doi.org/10.1016/j.coal.2009.07.012

Životić DR, Jovančićević B, Schwarzbauer J, Cvetković O, Gržetić I, Ercegovac M, Stojanović KA, Šajnović A. The petrographical and organic geochemical composition of coal from the East field, Bogovina Basin (Serbia). in International Journal of Coal Geology. 2010;81(4):227-241.
doi:10.1016/j.coal.2009.07.012 .

Životić, Dragana R., Jovančićević, Branimir, Schwarzbauer, Jan, Cvetković, Olga, Gržetić, Ivan, Ercegovac, Marko, Stojanović, Ksenija A., Šajnović, Aleksandra, "The petrographical and organic geochemical composition of coal from the East field, Bogovina Basin (Serbia)" in International Journal of Coal Geology, 81, no. 4 (2010):227-241,
https://doi.org/10.1016/j.coal.2009.07.012 . .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Gržetić, Ivan
AU  - Simić, Vladimir
AU  - Šćepanović, Vesna
AU  - Šćepanović, Zoran
PY  - 2009
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/137
AB  - The contents of potentially toxic trace elements were studied on coals from four basins of Eastern Serbia. Analyses were performed by ICP-MS method in laboratory of Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) in Hannover (Germany).The contents of potentially toxic trace elements in coals of Eastern Serbia is variable not only from basin to basin, but also within a basin. High As contents were detected in coals from the Senje-Resava basin (11.00 - 160.00 mg/kg), East field Bogovina basin (8.75 - 75.50 mg/kg) and Krepoljin basin (15.90 - 85.00 mg/kg), while in the other basins it is low. Selenium content is high in coals from East field of the Bogovina basin (1.11 - 28.90 mg/kg), and Mn content is high in coals from the Krepoljin basin. Increased contents of Co, Cr, Cu and Hg were detected in Senje-Resava and Krepoljin coals, and increased contents of Ni and Pb in Senje-Resava Krepoljin and East field Bogovina coals. Berilium and cadmium contents are low in all studied coals. Correlation analysis revealed that Be, Cr, Cu, Sb Co and Ni in Senje-Resava coals is most probably related to atrinite, while in coals from the other basins those elements occur within clay minerals and 'mineral-bituminous groundmass'. Manganese mostly comes from carbonate minerals.
AB  - Sadržaj potencijalno toksičnih mikroelemenata (As, Be, Cd, Co, Cr, Cu, Hg Mn, Ni, Pb, Sb, Se, Th i U) proučen je na četrdeset šest uzoraka uglja donjomiocenske starosti iz Senjsko-resavskog basena (ležišta Senjski rudnik Jelovac i Strmosten), Bogovinskog basena (Istočno polje), Sokobanjskog basena (ležište Soko) i Krepoljinskog basena (ležište Centralno polje). Analize su izvršene metodom masene spektrometrije indukovane kuplovane plazme (ICP-MS) u laboratoriji Saveznog zavoda za geonauke i mineralne sirovine (Bundesanstalt für Geowissenschaften und Rohstoffe-BGR) u Hanoveru (Nemačka). U odnosu na klark za mrke ugljeve visok sadržaj arsena konstatovan je uglju Senjsko-resavskog (prosečno 45,38 mg/kg), Istočnom polju Bogovinskog (35,20 mg/kg) i Krepoljinskom basenu (52,12 mg/kg), dok je u ostalim basenima nizak. Sadržaj selena visok je jedino u uglju Istočnog polja Bogovinskog basena (3,24 mg/kg), dok su visoke vrednosti mangana konstatovane jedino u uglju Krepoljinskog basena (435,70 mg/kg). Povišen sadržaj kobalta, hroma, bakra i žive konstatovan je u uglju Senjsko-resavskog i Krepoljinskog basena, a nikla i olova u uglju Senjsko-resavskog, Krepoljinskog i Istočnom polju Bogovinskog basena.
T2  - Tehnika - Rudarstvo, geologija i metalurgija
T1  - The content of potential toxic trace elements in Eastern Serbia coal basins
T1  - Sadržaj potencijalno toksičnih mikroelemenata u mrkim ugljevima Istočne Srbije
VL  - 60
IS  - 3
SP  - 1
EP  - 8
UR  - https://hdl.handle.net/21.15107/rcub_cherry_137
ER  - 

@article{
author = "Životić, Dragana R. and Gržetić, Ivan and Simić, Vladimir and Šćepanović, Vesna and Šćepanović, Zoran",
year = "2009",
abstract = "The contents of potentially toxic trace elements were studied on coals from four basins of Eastern Serbia. Analyses were performed by ICP-MS method in laboratory of Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) in Hannover (Germany).The contents of potentially toxic trace elements in coals of Eastern Serbia is variable not only from basin to basin, but also within a basin. High As contents were detected in coals from the Senje-Resava basin (11.00 - 160.00 mg/kg), East field Bogovina basin (8.75 - 75.50 mg/kg) and Krepoljin basin (15.90 - 85.00 mg/kg), while in the other basins it is low. Selenium content is high in coals from East field of the Bogovina basin (1.11 - 28.90 mg/kg), and Mn content is high in coals from the Krepoljin basin. Increased contents of Co, Cr, Cu and Hg were detected in Senje-Resava and Krepoljin coals, and increased contents of Ni and Pb in Senje-Resava Krepoljin and East field Bogovina coals. Berilium and cadmium contents are low in all studied coals. Correlation analysis revealed that Be, Cr, Cu, Sb Co and Ni in Senje-Resava coals is most probably related to atrinite, while in coals from the other basins those elements occur within clay minerals and 'mineral-bituminous groundmass'. Manganese mostly comes from carbonate minerals., Sadržaj potencijalno toksičnih mikroelemenata (As, Be, Cd, Co, Cr, Cu, Hg Mn, Ni, Pb, Sb, Se, Th i U) proučen je na četrdeset šest uzoraka uglja donjomiocenske starosti iz Senjsko-resavskog basena (ležišta Senjski rudnik Jelovac i Strmosten), Bogovinskog basena (Istočno polje), Sokobanjskog basena (ležište Soko) i Krepoljinskog basena (ležište Centralno polje). Analize su izvršene metodom masene spektrometrije indukovane kuplovane plazme (ICP-MS) u laboratoriji Saveznog zavoda za geonauke i mineralne sirovine (Bundesanstalt für Geowissenschaften und Rohstoffe-BGR) u Hanoveru (Nemačka). U odnosu na klark za mrke ugljeve visok sadržaj arsena konstatovan je uglju Senjsko-resavskog (prosečno 45,38 mg/kg), Istočnom polju Bogovinskog (35,20 mg/kg) i Krepoljinskom basenu (52,12 mg/kg), dok je u ostalim basenima nizak. Sadržaj selena visok je jedino u uglju Istočnog polja Bogovinskog basena (3,24 mg/kg), dok su visoke vrednosti mangana konstatovane jedino u uglju Krepoljinskog basena (435,70 mg/kg). Povišen sadržaj kobalta, hroma, bakra i žive konstatovan je u uglju Senjsko-resavskog i Krepoljinskog basena, a nikla i olova u uglju Senjsko-resavskog, Krepoljinskog i Istočnom polju Bogovinskog basena.",
journal = "Tehnika - Rudarstvo, geologija i metalurgija",
title = "The content of potential toxic trace elements in Eastern Serbia coal basins, Sadržaj potencijalno toksičnih mikroelemenata u mrkim ugljevima Istočne Srbije",
volume = "60",
number = "3",
pages = "1-8",
url = "https://hdl.handle.net/21.15107/rcub_cherry_137"
}

Životić, D. R., Gržetić, I., Simić, V., Šćepanović, V.,& Šćepanović, Z.. (2009). The content of potential toxic trace elements in Eastern Serbia coal basins. in Tehnika - Rudarstvo, geologija i metalurgija, 60(3), 1-8.
https://hdl.handle.net/21.15107/rcub_cherry_137

Životić DR, Gržetić I, Simić V, Šćepanović V, Šćepanović Z. The content of potential toxic trace elements in Eastern Serbia coal basins. in Tehnika - Rudarstvo, geologija i metalurgija. 2009;60(3):1-8.
https://hdl.handle.net/21.15107/rcub_cherry_137 .

Životić, Dragana R., Gržetić, Ivan, Simić, Vladimir, Šćepanović, Vesna, Šćepanović, Zoran, "The content of potential toxic trace elements in Eastern Serbia coal basins" in Tehnika - Rudarstvo, geologija i metalurgija, 60, no. 3 (2009):1-8,
https://hdl.handle.net/21.15107/rcub_cherry_137 .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Gržetić, Ivan
AU  - Simić, Vladimir
AU  - Popović, Velibor
AU  - Milićević, Valentina
PY  - 2008
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/136
AB  - The content of potentially toxic trace elements (As, Be, Cd, Co, Cr, Cu, Hg Mn, Ni, Pb, Sb, Se, Th i U) was studied on thirteen core coal samples from the II and III coal seams of the Drmno coal field, collected from the drillhole P-17/2002. Analyses were performed by ICPMS method in laboratory of Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) in Hannover (Germany). According to geometric mean values, lignite coal from the Kostolac basin has relatively high content of manganese (172,45 mg/kg), nickel (53,94 mg/kg), chromium (28,42 mg/kg), arsenic (25,15 mg/kg), copper (19,09 mg/kg) and cobalt (8,60 mg/kg), which are much higher than average world coals of the same rank. Content of other trace is similar to world coal average. Uranium and thorium content is lower than the world average, but in some parts of the coal seam U content is rather high.
AB  - Sadržaj potencijalno toksičnih mikroelemenata (As, Be, Cd, Co, Cr, Cu, Hg Mn, Ni, Pb, Sb, Se, Th i U) proučen je na trinaest uzoraka uglja iz II i III ugljenog sloja polja Drmno, prikupljenih iz bušotine P-17/2002. Analize su izvršene metodom masene spektrometrije indukovane kuplovane plazme (ICP-MS) u laboratoriji Saveznog geološkog Zavoda (Bundesanstalt für Geowissenschaften und Rohstoffe-BGR) u Hanoveru (Nemačka). Analizom geometrijske srednje vrednosti pokazalo se da ugalj Kostolačkog basena sadrži relativno visoke koncentracije mangana (172,45 mg/kg), nikla (53,94 mg/kg), hroma (28,42 mg/kg), arsena (25,15 mg/kg), bakra (19,09 mg/kg) i kobalta (8,60 mg/kg) koje su znatno iznad prosečnih vrednosti za svetske ugljeve istog ranga. Sadržaj ostalih ispitivanih elemenata je blizak prosečnim svetskim vrednostima. Sadržaj urana i torijuma je niži u odnosu na prosečne svetske vrednosti, mada postoje delovi slojeva uglja sa visokim sadržajem urana.
T2  - Tehnika - Rudarstvo, geologija i metalurgija
T1  - Potentially hazardous trace elements in coal from the Kostolac coal basin
T1  - Sadržaj potencijalno toksičnih mikroelemenata u uglju Kostolačkog basena
VL  - 59
IS  - 1
SP  - 5
EP  - 12
UR  - https://hdl.handle.net/21.15107/rcub_cherry_136
ER  - 

@article{
author = "Životić, Dragana R. and Gržetić, Ivan and Simić, Vladimir and Popović, Velibor and Milićević, Valentina",
year = "2008",
abstract = "The content of potentially toxic trace elements (As, Be, Cd, Co, Cr, Cu, Hg Mn, Ni, Pb, Sb, Se, Th i U) was studied on thirteen core coal samples from the II and III coal seams of the Drmno coal field, collected from the drillhole P-17/2002. Analyses were performed by ICPMS method in laboratory of Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) in Hannover (Germany). According to geometric mean values, lignite coal from the Kostolac basin has relatively high content of manganese (172,45 mg/kg), nickel (53,94 mg/kg), chromium (28,42 mg/kg), arsenic (25,15 mg/kg), copper (19,09 mg/kg) and cobalt (8,60 mg/kg), which are much higher than average world coals of the same rank. Content of other trace is similar to world coal average. Uranium and thorium content is lower than the world average, but in some parts of the coal seam U content is rather high., Sadržaj potencijalno toksičnih mikroelemenata (As, Be, Cd, Co, Cr, Cu, Hg Mn, Ni, Pb, Sb, Se, Th i U) proučen je na trinaest uzoraka uglja iz II i III ugljenog sloja polja Drmno, prikupljenih iz bušotine P-17/2002. Analize su izvršene metodom masene spektrometrije indukovane kuplovane plazme (ICP-MS) u laboratoriji Saveznog geološkog Zavoda (Bundesanstalt für Geowissenschaften und Rohstoffe-BGR) u Hanoveru (Nemačka). Analizom geometrijske srednje vrednosti pokazalo se da ugalj Kostolačkog basena sadrži relativno visoke koncentracije mangana (172,45 mg/kg), nikla (53,94 mg/kg), hroma (28,42 mg/kg), arsena (25,15 mg/kg), bakra (19,09 mg/kg) i kobalta (8,60 mg/kg) koje su znatno iznad prosečnih vrednosti za svetske ugljeve istog ranga. Sadržaj ostalih ispitivanih elemenata je blizak prosečnim svetskim vrednostima. Sadržaj urana i torijuma je niži u odnosu na prosečne svetske vrednosti, mada postoje delovi slojeva uglja sa visokim sadržajem urana.",
journal = "Tehnika - Rudarstvo, geologija i metalurgija",
title = "Potentially hazardous trace elements in coal from the Kostolac coal basin, Sadržaj potencijalno toksičnih mikroelemenata u uglju Kostolačkog basena",
volume = "59",
number = "1",
pages = "5-12",
url = "https://hdl.handle.net/21.15107/rcub_cherry_136"
}

Životić, D. R., Gržetić, I., Simić, V., Popović, V.,& Milićević, V.. (2008). Potentially hazardous trace elements in coal from the Kostolac coal basin. in Tehnika - Rudarstvo, geologija i metalurgija, 59(1), 5-12.
https://hdl.handle.net/21.15107/rcub_cherry_136

Životić DR, Gržetić I, Simić V, Popović V, Milićević V. Potentially hazardous trace elements in coal from the Kostolac coal basin. in Tehnika - Rudarstvo, geologija i metalurgija. 2008;59(1):5-12.
https://hdl.handle.net/21.15107/rcub_cherry_136 .

Životić, Dragana R., Gržetić, Ivan, Simić, Vladimir, Popović, Velibor, Milićević, Valentina, "Potentially hazardous trace elements in coal from the Kostolac coal basin" in Tehnika - Rudarstvo, geologija i metalurgija, 59, no. 1 (2008):5-12,
https://hdl.handle.net/21.15107/rcub_cherry_136 .

TY  - JOUR
AU  - Životić, Dragana R.
AU  - Wehner, Herman
AU  - Cvetković, Olga
AU  - Jovančićević, Branimir
AU  - Gržetić, Ivan
AU  - Scheeder, Georg
AU  - Vidal, Angelika
AU  - Šajnović, Aleksandra
AU  - Ercegovac, Marko
AU  - Simić, Vladimir
PY  - 2008
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/912
AB  - A petrological, organic geochemical and geochemical study was performed on coal samples from the Soko Mine, Soko Banja basin, Serbia. Ten coal and two carbonaceous clay samples were collected from fresh, working faces in the underground brown coal mine from different parts of the main coal seam. The Lower Miocene, low-rank coal of the Soko Mine is a typical humic coal with huminite concentrations of up to 76.2 vol.%, liptinite less than 14 vol.% and inertinite less than 11 vol.%. Ulminite is the most abundant maceral with variable amounts of densinite and clay minerals. Sporinite and resinite are the most common macerals of the liptinite group. Inertodetrinite is the most abundant maceral of the inertinite group. The mineral-bituminous groundmass identified in some coal samples, and carbonaceous marly clay, indicate sub-aquatic origin and strong bacterial decomposition. The mean random huminite reflectance (ulminite B) for the main coal seam is 0.40 +/- 0.05% Rr, which is typical for an immature to early mature stage of organic matter. The extract yields from the coal of the Soko Banja basin ranges from 9413 to 14,096 ppm, in which alkanes constituted 1.02-0.1%, aromatics 1.3-14.7%, asphaltenes 28.1-76.2% and resins 20.2-43.5%. The saturated hydrocarbon fractions included n-C-15 to n-C-32, with an odd carbon number that predominate in almost all the samples. The contents of n-C-27 and n-C-29 alkanes are extremely high in some samples, as a contribution of epicuticular waxes from higher plants. Acyclic isoprenoid hydrocarbons are minor constituents in the aliphatic fraction, and the pristane/phytane (Pr/Ph) ratio varies between 0.56 and 3.13, which implies anaerobic to oxic conditions during sedimentation. The most abundant diterpanes were abietane, dehydroabietane and 16 alpha(H)-phyllocladane. In samples from the upper part of the coal seam, diterpanes are the dominant constituents of the alkane fraction. Polycyclic alkanes of the triterpane type are important constituents of alkane fractions. The occurrence of beta beta- and alpha beta-type hopanes from C-27 to C-31, but without C-28, is typical for the Soko Banja coals. The major and trace elements in the coal were analysed using X-ray fluorescence (XRF), and inductively coupled plasma-mass spectrometry (ICP-MS). In comparison with world lignites, using the geometric mean value, the coal from the Soko Banja Basin has a high content of strontium (306.953 mg/kg). Higher values than the world lignites were obtained for Mo (3.614 mg/kg), Ni(8.119 mg/kg), Se (0.884 mg/kg), U (2.642 mg/kg) and W (0.148 mg/kg). Correlation analysis shows inorganic affinity for almost all the major and trace elements, except for S, which has an organic affinity. (c) 2007 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - International Journal of Coal Geology
T1  - Petrological, organic geochemical and geochemical characteristics of coal from the Soko mine, Serbia
VL  - 73
IS  - 3-4
SP  - 285
EP  - 306
DO  - 10.1016/j.coal.2007.07.001
ER  - 

@article{
author = "Životić, Dragana R. and Wehner, Herman and Cvetković, Olga and Jovančićević, Branimir and Gržetić, Ivan and Scheeder, Georg and Vidal, Angelika and Šajnović, Aleksandra and Ercegovac, Marko and Simić, Vladimir",
year = "2008",
abstract = "A petrological, organic geochemical and geochemical study was performed on coal samples from the Soko Mine, Soko Banja basin, Serbia. Ten coal and two carbonaceous clay samples were collected from fresh, working faces in the underground brown coal mine from different parts of the main coal seam. The Lower Miocene, low-rank coal of the Soko Mine is a typical humic coal with huminite concentrations of up to 76.2 vol.%, liptinite less than 14 vol.% and inertinite less than 11 vol.%. Ulminite is the most abundant maceral with variable amounts of densinite and clay minerals. Sporinite and resinite are the most common macerals of the liptinite group. Inertodetrinite is the most abundant maceral of the inertinite group. The mineral-bituminous groundmass identified in some coal samples, and carbonaceous marly clay, indicate sub-aquatic origin and strong bacterial decomposition. The mean random huminite reflectance (ulminite B) for the main coal seam is 0.40 +/- 0.05% Rr, which is typical for an immature to early mature stage of organic matter. The extract yields from the coal of the Soko Banja basin ranges from 9413 to 14,096 ppm, in which alkanes constituted 1.02-0.1%, aromatics 1.3-14.7%, asphaltenes 28.1-76.2% and resins 20.2-43.5%. The saturated hydrocarbon fractions included n-C-15 to n-C-32, with an odd carbon number that predominate in almost all the samples. The contents of n-C-27 and n-C-29 alkanes are extremely high in some samples, as a contribution of epicuticular waxes from higher plants. Acyclic isoprenoid hydrocarbons are minor constituents in the aliphatic fraction, and the pristane/phytane (Pr/Ph) ratio varies between 0.56 and 3.13, which implies anaerobic to oxic conditions during sedimentation. The most abundant diterpanes were abietane, dehydroabietane and 16 alpha(H)-phyllocladane. In samples from the upper part of the coal seam, diterpanes are the dominant constituents of the alkane fraction. Polycyclic alkanes of the triterpane type are important constituents of alkane fractions. The occurrence of beta beta- and alpha beta-type hopanes from C-27 to C-31, but without C-28, is typical for the Soko Banja coals. The major and trace elements in the coal were analysed using X-ray fluorescence (XRF), and inductively coupled plasma-mass spectrometry (ICP-MS). In comparison with world lignites, using the geometric mean value, the coal from the Soko Banja Basin has a high content of strontium (306.953 mg/kg). Higher values than the world lignites were obtained for Mo (3.614 mg/kg), Ni(8.119 mg/kg), Se (0.884 mg/kg), U (2.642 mg/kg) and W (0.148 mg/kg). Correlation analysis shows inorganic affinity for almost all the major and trace elements, except for S, which has an organic affinity. (c) 2007 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "International Journal of Coal Geology",
title = "Petrological, organic geochemical and geochemical characteristics of coal from the Soko mine, Serbia",
volume = "73",
number = "3-4",
pages = "285-306",
doi = "10.1016/j.coal.2007.07.001"
}

Životić, D. R., Wehner, H., Cvetković, O., Jovančićević, B., Gržetić, I., Scheeder, G., Vidal, A., Šajnović, A., Ercegovac, M.,& Simić, V.. (2008). Petrological, organic geochemical and geochemical characteristics of coal from the Soko mine, Serbia. in International Journal of Coal Geology
Elsevier Science Bv, Amsterdam., 73(3-4), 285-306.
https://doi.org/10.1016/j.coal.2007.07.001

Životić DR, Wehner H, Cvetković O, Jovančićević B, Gržetić I, Scheeder G, Vidal A, Šajnović A, Ercegovac M, Simić V. Petrological, organic geochemical and geochemical characteristics of coal from the Soko mine, Serbia. in International Journal of Coal Geology. 2008;73(3-4):285-306.
doi:10.1016/j.coal.2007.07.001 .

Životić, Dragana R., Wehner, Herman, Cvetković, Olga, Jovančićević, Branimir, Gržetić, Ivan, Scheeder, Georg, Vidal, Angelika, Šajnović, Aleksandra, Ercegovac, Marko, Simić, Vladimir, "Petrological, organic geochemical and geochemical characteristics of coal from the Soko mine, Serbia" in International Journal of Coal Geology, 73, no. 3-4 (2008):285-306,
https://doi.org/10.1016/j.coal.2007.07.001 . .