TY  - JOUR
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija A.
AU  - Schwarzbauer, Jan
AU  - Kostić, Aleksandar
AU  - Jovančićević, Branimir
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4846
AB  - The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were performed on two selected samples that showed high content of total organic carbon and hydrocarbon generation potential, but also certain variations in sources/depositional environment of organic matter (type I and mixed type I/II kerogen) within previous research of the oil shales sample set. The biomarker signatures were evaluated using gas chromatography-mass spectrometry (GC-MS) and δ13C of individual n-alkanes in bitumen and liquid pyrolysates. The molecular composition of liquid pyrolysates from the OS is very similar to those in initial bitumen, independently on kerogen type, confirming algal origin of organic matter (OM) deposited in lacustrine environment, even more apparently than results of initial bitumen. Therefore, OS can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal alterations, therefore the source fingerprints sometimes notably disappear. The liquid pyrolysates from the CS have the distributions of biomarkers similar to those in crude oils. The biomarker maturity parameters showed slightly higher values in the CS pyrolysate of mixed type I/II kerogen in relation to type I kerogen. δ13C of n-alkanes in liquid pyrolysates from the OS are isotopically lighter in comparison to bitumen, independently on kerogen type. Oppositely, in liquid pyrolysates from the CS, they become heavier than in bitumen, indicating the thermal influence on δ13C signatures, with more pronounced difference for type I kerogen.
PB  - Elsevier
T2  - Marine and Petroleum Geology
T1  - A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
VL  - 136
SP  - 105383
DO  - 10.1016/j.marpetgeo.2021.105383
ER  - 

@article{
author = "Gajica, Gordana and Šajnović, Aleksandra and Stojanović, Ksenija A. and Schwarzbauer, Jan and Kostić, Aleksandar and Jovančićević, Branimir",
year = "2022",
abstract = "The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were performed on two selected samples that showed high content of total organic carbon and hydrocarbon generation potential, but also certain variations in sources/depositional environment of organic matter (type I and mixed type I/II kerogen) within previous research of the oil shales sample set. The biomarker signatures were evaluated using gas chromatography-mass spectrometry (GC-MS) and δ13C of individual n-alkanes in bitumen and liquid pyrolysates. The molecular composition of liquid pyrolysates from the OS is very similar to those in initial bitumen, independently on kerogen type, confirming algal origin of organic matter (OM) deposited in lacustrine environment, even more apparently than results of initial bitumen. Therefore, OS can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal alterations, therefore the source fingerprints sometimes notably disappear. The liquid pyrolysates from the CS have the distributions of biomarkers similar to those in crude oils. The biomarker maturity parameters showed slightly higher values in the CS pyrolysate of mixed type I/II kerogen in relation to type I kerogen. δ13C of n-alkanes in liquid pyrolysates from the OS are isotopically lighter in comparison to bitumen, independently on kerogen type. Oppositely, in liquid pyrolysates from the CS, they become heavier than in bitumen, indicating the thermal influence on δ13C signatures, with more pronounced difference for type I kerogen.",
publisher = "Elsevier",
journal = "Marine and Petroleum Geology",
title = "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)",
volume = "136",
pages = "105383",
doi = "10.1016/j.marpetgeo.2021.105383"
}

Gajica, G., Šajnović, A., Stojanović, K. A., Schwarzbauer, J., Kostić, A.,& Jovančićević, B.. (2022). A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems). in Marine and Petroleum Geology
Elsevier., 136, 105383.
https://doi.org/10.1016/j.marpetgeo.2021.105383

Gajica G, Šajnović A, Stojanović KA, Schwarzbauer J, Kostić A, Jovančićević B. A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems). in Marine and Petroleum Geology. 2022;136:105383.
doi:10.1016/j.marpetgeo.2021.105383 .

Gajica, Gordana, Šajnović, Aleksandra, Stojanović, Ksenija A., Schwarzbauer, Jan, Kostić, Aleksandar, Jovančićević, Branimir, "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, 136 (2022):105383,
https://doi.org/10.1016/j.marpetgeo.2021.105383 . .

TY  - JOUR
AU  - Kašanin-Grubin, Milica
AU  - Hagemann, Lukas
AU  - Gajica, Gordana
AU  - Štrbac, Snežana
AU  - Jovančićević, Branimir
AU  - Vasić, Nebojša
AU  - Šajnović, Aleksandra
AU  - Đogo Mračević, Svetlana
AU  - Schwarzbauer, Jan
PY  - 2020
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5077
AB  - The objective of this study is geochronological investigation of sedimentological and inorganic composition, in the Danube Djerdap Lake sediments in order to obtain reliable information about former pollution. Eleven samples were taken from the 135-cm-deep sediment core drilled at the Orlova location. Since the core represents sediments deposited during 1972–2016, the sedimentation rate of ~ 3 cm year−1 was estimated. Grain size, mineralogical and geochemical composition was determined. Sediments are sandy silts and clayey silts, and only the deepest and shallowest layers contain > 30% of sand-size fraction. The highest concentrations of minor elements are found in the oldest sediment (1972–1977) as a consequence of the high flux of the material from variable sources. During the sedimentation period (1975–1990), the concentrations of analyzed elements are generally decreasing until the beginning of 1990s. After this period, there are two distinct decreases and two distinct increases in concentrations of elements. The fluctuations in minor element concentrations are a consequence of both natural and anthropogenic sources. Granitic rocks situated south are source of minerals that carry minor elements. Enrichment Factor, Geoaccumulation Index, Contamination Factor and Pollution Load Index indicate that concentrations of certain minor elements at specific depositional periods have anthropogenic source.
T2  - Environmental Geochemistry and Health volume
T1  - Geochronological investigation of sediments of the Danube Djerdap lake (Serbia) - organic pollutants
VL  - 42
SP  - 693
EP  - 707
DO  - 10.1007/s10653-019-00403-6
ER  - 

@article{
author = "Kašanin-Grubin, Milica and Hagemann, Lukas and Gajica, Gordana and Štrbac, Snežana and Jovančićević, Branimir and Vasić, Nebojša and Šajnović, Aleksandra and Đogo Mračević, Svetlana and Schwarzbauer, Jan",
year = "2020",
abstract = "The objective of this study is geochronological investigation of sedimentological and inorganic composition, in the Danube Djerdap Lake sediments in order to obtain reliable information about former pollution. Eleven samples were taken from the 135-cm-deep sediment core drilled at the Orlova location. Since the core represents sediments deposited during 1972–2016, the sedimentation rate of ~ 3 cm year−1 was estimated. Grain size, mineralogical and geochemical composition was determined. Sediments are sandy silts and clayey silts, and only the deepest and shallowest layers contain > 30% of sand-size fraction. The highest concentrations of minor elements are found in the oldest sediment (1972–1977) as a consequence of the high flux of the material from variable sources. During the sedimentation period (1975–1990), the concentrations of analyzed elements are generally decreasing until the beginning of 1990s. After this period, there are two distinct decreases and two distinct increases in concentrations of elements. The fluctuations in minor element concentrations are a consequence of both natural and anthropogenic sources. Granitic rocks situated south are source of minerals that carry minor elements. Enrichment Factor, Geoaccumulation Index, Contamination Factor and Pollution Load Index indicate that concentrations of certain minor elements at specific depositional periods have anthropogenic source.",
journal = "Environmental Geochemistry and Health volume",
title = "Geochronological investigation of sediments of the Danube Djerdap lake (Serbia) - organic pollutants",
volume = "42",
pages = "693-707",
doi = "10.1007/s10653-019-00403-6"
}

Kašanin-Grubin, M., Hagemann, L., Gajica, G., Štrbac, S., Jovančićević, B., Vasić, N., Šajnović, A., Đogo Mračević, S.,& Schwarzbauer, J.. (2020). Geochronological investigation of sediments of the Danube Djerdap lake (Serbia) - organic pollutants. in Environmental Geochemistry and Health volume, 42, 693-707.
https://doi.org/10.1007/s10653-019-00403-6

Kašanin-Grubin M, Hagemann L, Gajica G, Štrbac S, Jovančićević B, Vasić N, Šajnović A, Đogo Mračević S, Schwarzbauer J. Geochronological investigation of sediments of the Danube Djerdap lake (Serbia) - organic pollutants. in Environmental Geochemistry and Health volume. 2020;42:693-707.
doi:10.1007/s10653-019-00403-6 .

Kašanin-Grubin, Milica, Hagemann, Lukas, Gajica, Gordana, Štrbac, Snežana, Jovančićević, Branimir, Vasić, Nebojša, Šajnović, Aleksandra, Đogo Mračević, Svetlana, Schwarzbauer, Jan, "Geochronological investigation of sediments of the Danube Djerdap lake (Serbia) - organic pollutants" in Environmental Geochemistry and Health volume, 42 (2020):693-707,
https://doi.org/10.1007/s10653-019-00403-6 . .

TY  - JOUR
AU  - Hagemann, Lukas
AU  - Kašanin-Grubin, Milica
AU  - Gajica, Gordana
AU  - Štrbac, Snežana
AU  - Šajnović, Aleksandra
AU  - Jovančićević, Branimir
AU  - Vasić, Nebojša
AU  - Schwarzbauer, Jan
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4275
AB  - The original version of this article unfortunately contained an error. The authors missed to mention that this project received financial support by the Ministry of Education, Science and Technological Development of the Republic of Serbia, Grants 176006, 176019. In addition, the Figure 1 was published erroneously. The corrected Figure 1 is shown below(Figure presented.). © 2020, Springer Nature Switzerland AG.
PB  - Springer Nature Switzerland
T2  - Water, Air, and Soil Pollution
T1  - Correction to: Four Decades of Organic Anthropogenic Pollution: a Compilation for Djerdap Lake Sediments, Serbia (Water, Air, & Soil Pollution, (2019), 230, 10, (246), 10.1007/s11270-019-4277-8)
VL  - 231
IS  - 2
SP  - 67
DO  - 10.1007/s11270-020-4420-6
ER  - 

@article{
author = "Hagemann, Lukas and Kašanin-Grubin, Milica and Gajica, Gordana and Štrbac, Snežana and Šajnović, Aleksandra and Jovančićević, Branimir and Vasić, Nebojša and Schwarzbauer, Jan",
year = "2020",
abstract = "The original version of this article unfortunately contained an error. The authors missed to mention that this project received financial support by the Ministry of Education, Science and Technological Development of the Republic of Serbia, Grants 176006, 176019. In addition, the Figure 1 was published erroneously. The corrected Figure 1 is shown below(Figure presented.). © 2020, Springer Nature Switzerland AG.",
publisher = "Springer Nature Switzerland",
journal = "Water, Air, and Soil Pollution",
title = "Correction to: Four Decades of Organic Anthropogenic Pollution: a Compilation for Djerdap Lake Sediments, Serbia (Water, Air, & Soil Pollution, (2019), 230, 10, (246), 10.1007/s11270-019-4277-8)",
volume = "231",
number = "2",
pages = "67",
doi = "10.1007/s11270-020-4420-6"
}

Hagemann, L., Kašanin-Grubin, M., Gajica, G., Štrbac, S., Šajnović, A., Jovančićević, B., Vasić, N.,& Schwarzbauer, J.. (2020). Correction to: Four Decades of Organic Anthropogenic Pollution: a Compilation for Djerdap Lake Sediments, Serbia (Water, Air, & Soil Pollution, (2019), 230, 10, (246), 10.1007/s11270-019-4277-8). in Water, Air, and Soil Pollution
Springer Nature Switzerland., 231(2), 67.
https://doi.org/10.1007/s11270-020-4420-6

Hagemann L, Kašanin-Grubin M, Gajica G, Štrbac S, Šajnović A, Jovančićević B, Vasić N, Schwarzbauer J. Correction to: Four Decades of Organic Anthropogenic Pollution: a Compilation for Djerdap Lake Sediments, Serbia (Water, Air, & Soil Pollution, (2019), 230, 10, (246), 10.1007/s11270-019-4277-8). in Water, Air, and Soil Pollution. 2020;231(2):67.
doi:10.1007/s11270-020-4420-6 .

Hagemann, Lukas, Kašanin-Grubin, Milica, Gajica, Gordana, Štrbac, Snežana, Šajnović, Aleksandra, Jovančićević, Branimir, Vasić, Nebojša, Schwarzbauer, Jan, "Correction to: Four Decades of Organic Anthropogenic Pollution: a Compilation for Djerdap Lake Sediments, Serbia (Water, Air, & Soil Pollution, (2019), 230, 10, (246), 10.1007/s11270-019-4277-8)" in Water, Air, and Soil Pollution, 231, no. 2 (2020):67,
https://doi.org/10.1007/s11270-020-4420-6 . .

TY  - JOUR
AU  - Šolević-Knudsen, Tatjana
AU  - Stojanović, Ksenija A.
AU  - Jovančićević, Branimir
AU  - Mandić, Gorica
AU  - Schwarzbauer, Jan
AU  - Vitorović, Dragomir K.
PY  - 2006
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/812
AB  - Twenty-five crude oils originating from the Velebit oil field (SE Pannonian Basin), the most important oil field in Serbia, were investigated. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were analyzed by gas chromatography-mass spectrometry (GC-MS). Based on the distribution and abundance of these compounds, a large number of source and maturation parameters were calculated, particularly those most often used in correlation studies of oils. The examined samples were classified according to their origin and level of thermal maturity using factor, cluster and discriminant analyses. According to the source and maturation parameters, combined factor and cluster analyses using the Ward method enabled the categorization of the investigated oils into three groups. The cluster Ward analysis was shown to be of greater susceptibility and reliability. However, in addition to the two aforementioned methods, K-Means cluster analysis and discriminant analysis were shown to be necessary for a more precise and detailed categorization in the case of a large number of samples in one group. Consequently, it was concluded that factor and cluster K-Means and Ward analyses can generally be used for the interpretation of saturated biomarkers in correlation studies of oils, but the observed results have to be checked, i.e., confirmed by discriminant analysis.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia)
VL  - 71
IS  - 7
SP  - 745
EP  - 769
DO  - 10.2298/JSC0607745S
ER  - 

@article{
author = "Šolević-Knudsen, Tatjana and Stojanović, Ksenija A. and Jovančićević, Branimir and Mandić, Gorica and Schwarzbauer, Jan and Vitorović, Dragomir K.",
year = "2006",
abstract = "Twenty-five crude oils originating from the Velebit oil field (SE Pannonian Basin), the most important oil field in Serbia, were investigated. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were analyzed by gas chromatography-mass spectrometry (GC-MS). Based on the distribution and abundance of these compounds, a large number of source and maturation parameters were calculated, particularly those most often used in correlation studies of oils. The examined samples were classified according to their origin and level of thermal maturity using factor, cluster and discriminant analyses. According to the source and maturation parameters, combined factor and cluster analyses using the Ward method enabled the categorization of the investigated oils into three groups. The cluster Ward analysis was shown to be of greater susceptibility and reliability. However, in addition to the two aforementioned methods, K-Means cluster analysis and discriminant analysis were shown to be necessary for a more precise and detailed categorization in the case of a large number of samples in one group. Consequently, it was concluded that factor and cluster K-Means and Ward analyses can generally be used for the interpretation of saturated biomarkers in correlation studies of oils, but the observed results have to be checked, i.e., confirmed by discriminant analysis.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia)",
volume = "71",
number = "7",
pages = "745-769",
doi = "10.2298/JSC0607745S"
}

Šolević-Knudsen, T., Stojanović, K. A., Jovančićević, B., Mandić, G., Schwarzbauer, J.,& Vitorović, D. K.. (2006). Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 71(7), 745-769.
https://doi.org/10.2298/JSC0607745S

Šolević-Knudsen T, Stojanović KA, Jovančićević B, Mandić G, Schwarzbauer J, Vitorović DK. Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society. 2006;71(7):745-769.
doi:10.2298/JSC0607745S .

Šolević-Knudsen, Tatjana, Stojanović, Ksenija A., Jovančićević, Branimir, Mandić, Gorica, Schwarzbauer, Jan, Vitorović, Dragomir K., "Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia)" in Journal of the Serbian Chemical Society, 71, no. 7 (2006):745-769,
https://doi.org/10.2298/JSC0607745S . .