TY  - CONF
AU  - Liu, Bangjun
AU  - Bechtel, Achim
AU  - Zhao, Cunliang
AU  - Stojanović, Ksenija
AU  - Tian, Zeqi
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6398
AB  - Considering the significance of liptinite maceral group to the hydrocarbon generative potential, a comprehensive petrographical, biomarker and isotopic study is performed on liptinite-rich coal to determine the origin of organic matter (OM), depositional conditions and maturity. The samples were collected from the Pliocene Jinsuo Basin (samples YNP and YND) and Eocene Shenbei Basin (sample SB) in China. The obtained results indicate mixed gymnosperm (Pinacea) and angiosperm sources of OM in the sporinite dominated YNP sample. The immature OM (Rr=0.25%) was deposited under oxidizing conditions with pronounced microbial activity. The OM of the resinite-rich YND sample was mostly derived from woody parts of plants and deposited under reducing conditions. The presence of polycyclic aromatic hydrocarbons at low maturity level (Rr=0.23%) is indicative for certain post-depositional events and/or palaeo-wildfires, that may be responsible for the observation of two kinds of resinite in this sample. The main sources of OM in the resinite-rich sample SB (Rr = 0.46%) were species of the conifer families Cupressaceae and Pinaceae. The OM was deposited under reducing conditions, with a very limited microbial activity. The δ2D values of all extracted liptinite-rich coal are lower than that of coal/kerogen, and falls in the range of lipids and resins.
PB  - European Association of Geoscientists and Engineers
C3  - 31st International Meeting on Organic Geochemistry
T1  - Comprehensive Study of Liptinite-Rich Coal from the Pliocene Jinsuo Basin and the Eocene Shenbei Basin (China)
SP  - 1
EP  - 2
DO  - 10.3997/2214-4609.202333066
ER  - 

@conference{
author = "Liu, Bangjun and Bechtel, Achim and Zhao, Cunliang and Stojanović, Ksenija and Tian, Zeqi",
year = "2023",
abstract = "Considering the significance of liptinite maceral group to the hydrocarbon generative potential, a comprehensive petrographical, biomarker and isotopic study is performed on liptinite-rich coal to determine the origin of organic matter (OM), depositional conditions and maturity. The samples were collected from the Pliocene Jinsuo Basin (samples YNP and YND) and Eocene Shenbei Basin (sample SB) in China. The obtained results indicate mixed gymnosperm (Pinacea) and angiosperm sources of OM in the sporinite dominated YNP sample. The immature OM (Rr=0.25%) was deposited under oxidizing conditions with pronounced microbial activity. The OM of the resinite-rich YND sample was mostly derived from woody parts of plants and deposited under reducing conditions. The presence of polycyclic aromatic hydrocarbons at low maturity level (Rr=0.23%) is indicative for certain post-depositional events and/or palaeo-wildfires, that may be responsible for the observation of two kinds of resinite in this sample. The main sources of OM in the resinite-rich sample SB (Rr = 0.46%) were species of the conifer families Cupressaceae and Pinaceae. The OM was deposited under reducing conditions, with a very limited microbial activity. The δ2D values of all extracted liptinite-rich coal are lower than that of coal/kerogen, and falls in the range of lipids and resins.",
publisher = "European Association of Geoscientists and Engineers",
journal = "31st International Meeting on Organic Geochemistry",
title = "Comprehensive Study of Liptinite-Rich Coal from the Pliocene Jinsuo Basin and the Eocene Shenbei Basin (China)",
pages = "1-2",
doi = "10.3997/2214-4609.202333066"
}

Liu, B., Bechtel, A., Zhao, C., Stojanović, K.,& Tian, Z.. (2023). Comprehensive Study of Liptinite-Rich Coal from the Pliocene Jinsuo Basin and the Eocene Shenbei Basin (China). in 31st International Meeting on Organic Geochemistry
European Association of Geoscientists and Engineers., 1-2.
https://doi.org/10.3997/2214-4609.202333066

Liu B, Bechtel A, Zhao C, Stojanović K, Tian Z. Comprehensive Study of Liptinite-Rich Coal from the Pliocene Jinsuo Basin and the Eocene Shenbei Basin (China). in 31st International Meeting on Organic Geochemistry. 2023;:1-2.
doi:10.3997/2214-4609.202333066 .

Liu, Bangjun, Bechtel, Achim, Zhao, Cunliang, Stojanović, Ksenija, Tian, Zeqi, "Comprehensive Study of Liptinite-Rich Coal from the Pliocene Jinsuo Basin and the Eocene Shenbei Basin (China)" in 31st International Meeting on Organic Geochemistry (2023):1-2,
https://doi.org/10.3997/2214-4609.202333066 . .

TY  - CONF
AU  - Stevanović, Jelena
AU  - Vuković, Nikola
AU  - Gross, Doris
AU  - Sachsenhofer, Reinhard
AU  - Kostić, Aleksandar
AU  - Kojić, Ivan
AU  - Stojanović, Ksenija
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6400
AB  - In the last two decades, the Turija oil field (SE Pannonian Basin, Serbia) has attracted attention through oil discoveries in new wells. The source rocks of the Turija oil are still unknown. In this study, potential lower Miocene (Ottnangian-Karpatian) to upper Miocene (Pannonian) source rocks from some boreholes near the Turija oil field were investigated to determine the origin, depositional environment, hydrocarbon potential and maturity of organic matter (OM). The Rock-Eval method, biomarker and carbon isotope analyses were used. The obtained results indicate a mixed aquatic-terrestrial (Ottnangian-Karpatian and Badenian) and predominantly aquatic (Badenian and Pannonian) origin of OM, deposited under variable, reducing to oxic conditions. The majority of studied samples show a good oil generation potential. Numerous maturity indicators imply that maturity of OM varies from immature to mature. The large heterogeneity (facies and maturity) of the Badenian samples is consistent with remarkable environmental changes caused by the uplift of the Alps and Carpathians in the middle to late Badenian.
PB  - European Association of Geoscientists and Engineers
C3  - 31st International Meeting on Organic Geochemistry
T1  - Search for the Source Rocks in the Turija Oil Field Region (Se Pannonian Basin, Serbia)
SP  - 175
EP  - 175
DO  - 10.3997/2214-4609.202333175
ER  - 

@conference{
author = "Stevanović, Jelena and Vuković, Nikola and Gross, Doris and Sachsenhofer, Reinhard and Kostić, Aleksandar and Kojić, Ivan and Stojanović, Ksenija",
year = "2023",
abstract = "In the last two decades, the Turija oil field (SE Pannonian Basin, Serbia) has attracted attention through oil discoveries in new wells. The source rocks of the Turija oil are still unknown. In this study, potential lower Miocene (Ottnangian-Karpatian) to upper Miocene (Pannonian) source rocks from some boreholes near the Turija oil field were investigated to determine the origin, depositional environment, hydrocarbon potential and maturity of organic matter (OM). The Rock-Eval method, biomarker and carbon isotope analyses were used. The obtained results indicate a mixed aquatic-terrestrial (Ottnangian-Karpatian and Badenian) and predominantly aquatic (Badenian and Pannonian) origin of OM, deposited under variable, reducing to oxic conditions. The majority of studied samples show a good oil generation potential. Numerous maturity indicators imply that maturity of OM varies from immature to mature. The large heterogeneity (facies and maturity) of the Badenian samples is consistent with remarkable environmental changes caused by the uplift of the Alps and Carpathians in the middle to late Badenian.",
publisher = "European Association of Geoscientists and Engineers",
journal = "31st International Meeting on Organic Geochemistry",
title = "Search for the Source Rocks in the Turija Oil Field Region (Se Pannonian Basin, Serbia)",
pages = "175-175",
doi = "10.3997/2214-4609.202333175"
}

Stevanović, J., Vuković, N., Gross, D., Sachsenhofer, R., Kostić, A., Kojić, I.,& Stojanović, K.. (2023). Search for the Source Rocks in the Turija Oil Field Region (Se Pannonian Basin, Serbia). in 31st International Meeting on Organic Geochemistry
European Association of Geoscientists and Engineers., 175-175.
https://doi.org/10.3997/2214-4609.202333175

Stevanović J, Vuković N, Gross D, Sachsenhofer R, Kostić A, Kojić I, Stojanović K. Search for the Source Rocks in the Turija Oil Field Region (Se Pannonian Basin, Serbia). in 31st International Meeting on Organic Geochemistry. 2023;:175-175.
doi:10.3997/2214-4609.202333175 .

Stevanović, Jelena, Vuković, Nikola, Gross, Doris, Sachsenhofer, Reinhard, Kostić, Aleksandar, Kojić, Ivan, Stojanović, Ksenija, "Search for the Source Rocks in the Turija Oil Field Region (Se Pannonian Basin, Serbia)" in 31st International Meeting on Organic Geochemistry (2023):175-175,
https://doi.org/10.3997/2214-4609.202333175 . .

TY  - CONF
AU  - Zdravkov, Alexander
AU  - Gross, Doris
AU  - Bechtel, Achim
AU  - Stojanović, Ksenija
AU  - Kojić, Ivan
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6402
AB  - Three 0.2-0.6 m thick coal seams, representing seam splits from a locally thicker seam (~1.8
m), comprise the Eocene Suhostrel coal deposit from the S-SW margin of the E1-2-Ol1 Padesh
Graben. High TOC contents (avg. ~86 wt.%, daf), VR (avg. Ro = 1.05%) and Tmax (avg. 457°C),
argue for high vol. A/medium vol. bituminous coalification rank. Maceral composition is
dominated by vitrinite (avg. ~ 95 vol.%), represented by detrovitrinite (e.g., collodetrinite, avg.
37.5 vol.%, and vitrodetrinite, avg. 19.2 vol.%) and collotelinite (avg. 38.0 vol.%, mostly
gelified leaf-derived tissues, e.g. phyllo-vitrinite). Liptinite (avg. ~5 vol.%) includes cutinite
and microsporinite. Predominance of mid- and long-chain n-alkanes argues for peat formation
from a mixture of aquatic macrophytes and terrestrial vascular plants. Low Vegetation Index
values (VI = 0.1-3.2, avg. 0.8; Calder et al., 1991) denote major organic matter contribution
from vegetation with poor preservation potential. This is compatible with the presence of
oleanane, confirming input from angiosperm plants. The absence of resin-derived sesqui- and
diterpenoid hydrocarbons argues for an insignificant role of conifers during peat formation.
Reconstructed depositional settings (Fig. 1) argue for organic matter deposition under marginal
aquatic, marsh/fen-type peatland with meso- to rheotrophic characteristics (Groundwater Index,
GWI = 0.3-7.2, avg. 1.4; Calder et al., 1991). High mineral matter contents (ash yields 21-47
wt.%) imply hydrologically active environment with frequent (perhaps seasonal) changes in Eh
settings. Low concentrations of hopanoid biomarkers imply limited aerobic degradation of the
plant remains. Post-depositional marine influence and downward infiltrating sulfate-rich waters
are considered responsible for the presence of dibenzothiophene and its methylated derivatives.
PB  - Geological Society of Greece
C3  - Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece
C3  - Bulletin of the Geological Society Special Publication
T1  - Paleoenvironmental settings of peat formation within Padesh Graben, SW Bulgaria, deduced from maceral analysis and geochemical properties of Suhostrel Coal
VL  - 12
SP  - 53
EP  - 53
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6402
ER  - 

@conference{
author = "Zdravkov, Alexander and Gross, Doris and Bechtel, Achim and Stojanović, Ksenija and Kojić, Ivan",
year = "2023",
abstract = "Three 0.2-0.6 m thick coal seams, representing seam splits from a locally thicker seam (~1.8
m), comprise the Eocene Suhostrel coal deposit from the S-SW margin of the E1-2-Ol1 Padesh
Graben. High TOC contents (avg. ~86 wt.%, daf), VR (avg. Ro = 1.05%) and Tmax (avg. 457°C),
argue for high vol. A/medium vol. bituminous coalification rank. Maceral composition is
dominated by vitrinite (avg. ~ 95 vol.%), represented by detrovitrinite (e.g., collodetrinite, avg.
37.5 vol.%, and vitrodetrinite, avg. 19.2 vol.%) and collotelinite (avg. 38.0 vol.%, mostly
gelified leaf-derived tissues, e.g. phyllo-vitrinite). Liptinite (avg. ~5 vol.%) includes cutinite
and microsporinite. Predominance of mid- and long-chain n-alkanes argues for peat formation
from a mixture of aquatic macrophytes and terrestrial vascular plants. Low Vegetation Index
values (VI = 0.1-3.2, avg. 0.8; Calder et al., 1991) denote major organic matter contribution
from vegetation with poor preservation potential. This is compatible with the presence of
oleanane, confirming input from angiosperm plants. The absence of resin-derived sesqui- and
diterpenoid hydrocarbons argues for an insignificant role of conifers during peat formation.
Reconstructed depositional settings (Fig. 1) argue for organic matter deposition under marginal
aquatic, marsh/fen-type peatland with meso- to rheotrophic characteristics (Groundwater Index,
GWI = 0.3-7.2, avg. 1.4; Calder et al., 1991). High mineral matter contents (ash yields 21-47
wt.%) imply hydrologically active environment with frequent (perhaps seasonal) changes in Eh
settings. Low concentrations of hopanoid biomarkers imply limited aerobic degradation of the
plant remains. Post-depositional marine influence and downward infiltrating sulfate-rich waters
are considered responsible for the presence of dibenzothiophene and its methylated derivatives.",
publisher = "Geological Society of Greece",
journal = "Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece, Bulletin of the Geological Society Special Publication",
title = "Paleoenvironmental settings of peat formation within Padesh Graben, SW Bulgaria, deduced from maceral analysis and geochemical properties of Suhostrel Coal",
volume = "12",
pages = "53-53",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6402"
}

Zdravkov, A., Gross, D., Bechtel, A., Stojanović, K.,& Kojić, I.. (2023). Paleoenvironmental settings of peat formation within Padesh Graben, SW Bulgaria, deduced from maceral analysis and geochemical properties of Suhostrel Coal. in Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece
Geological Society of Greece., 12, 53-53.
https://hdl.handle.net/21.15107/rcub_cherry_6402

Zdravkov A, Gross D, Bechtel A, Stojanović K, Kojić I. Paleoenvironmental settings of peat formation within Padesh Graben, SW Bulgaria, deduced from maceral analysis and geochemical properties of Suhostrel Coal. in Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece. 2023;12:53-53.
https://hdl.handle.net/21.15107/rcub_cherry_6402 .

Zdravkov, Alexander, Gross, Doris, Bechtel, Achim, Stojanović, Ksenija, Kojić, Ivan, "Paleoenvironmental settings of peat formation within Padesh Graben, SW Bulgaria, deduced from maceral analysis and geochemical properties of Suhostrel Coal" in Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece, 12 (2023):53-53,
https://hdl.handle.net/21.15107/rcub_cherry_6402 .

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  - CONF
AU  - Zdravkov, Alexander
AU  - Gross, Doris
AU  - Stojanović, Ksenija
AU  - Bechtel, Achim
AU  - Kojić, Ivan
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6399
AB  - In the current study formation of coal in the Suhostrel (Early-Mid Eocene) and the Bobov Dol (Late Oligocene) basins located in the SW Bulgaria was evaluated using organic petrographic characteristics and biomarker patterns. Furthermore, the potential of biomarkers to indicate climate cooling trend in the late Oligocene, which was less pronounced in Bulgaria compared to the global one was examined. Studied coals significantly differ in their coalification degree: Suhostrel (Ro ~ 1.10%), Bobov Dol (Ro ~ 0.45–0.50%). The obtained results show that main organic matter (OM) sources of Bobov Dol coal were mixed Pinaceae/Cupressaceae conifer communities from moderately wet oligo- to mesotrophic swamps. OM of Suhostrel coal is mainly derived from mixed angiosperm hydrophytic and woody vegetation, with the predominance of the former. The peatification was performed under reducing conditions with occasional marine ingressions into the paleomire. Although comparison of biomarker patterns at different OM maturity levels is complicated, some relevant indication can be observed from the compositions of non-hopanoid terpenoids, which showed that mild late Oligocene climate cooling in Bulgaria was associated with change from hydrophytic angiosperm- to gymnosperm-dominated peatlands. This is consistent with the results of investigation of the Bulgarian Paleogene flora.
PB  - European Association of Geoscientists and Engineers
C3  - 31st International Meeting on Organic Geochemistry
T1  - Comparative Petrographical and Organic Geochemical Study of Eocene and Oligocene Coal Basins from Sw Bulgaria
SP  - 1
EP  - 2
DO  - 10.3997/2214-4609.202333034
ER  - 

@conference{
author = "Zdravkov, Alexander and Gross, Doris and Stojanović, Ksenija and Bechtel, Achim and Kojić, Ivan",
year = "2023",
abstract = "In the current study formation of coal in the Suhostrel (Early-Mid Eocene) and the Bobov Dol (Late Oligocene) basins located in the SW Bulgaria was evaluated using organic petrographic characteristics and biomarker patterns. Furthermore, the potential of biomarkers to indicate climate cooling trend in the late Oligocene, which was less pronounced in Bulgaria compared to the global one was examined. Studied coals significantly differ in their coalification degree: Suhostrel (Ro ~ 1.10%), Bobov Dol (Ro ~ 0.45–0.50%). The obtained results show that main organic matter (OM) sources of Bobov Dol coal were mixed Pinaceae/Cupressaceae conifer communities from moderately wet oligo- to mesotrophic swamps. OM of Suhostrel coal is mainly derived from mixed angiosperm hydrophytic and woody vegetation, with the predominance of the former. The peatification was performed under reducing conditions with occasional marine ingressions into the paleomire. Although comparison of biomarker patterns at different OM maturity levels is complicated, some relevant indication can be observed from the compositions of non-hopanoid terpenoids, which showed that mild late Oligocene climate cooling in Bulgaria was associated with change from hydrophytic angiosperm- to gymnosperm-dominated peatlands. This is consistent with the results of investigation of the Bulgarian Paleogene flora.",
publisher = "European Association of Geoscientists and Engineers",
journal = "31st International Meeting on Organic Geochemistry",
title = "Comparative Petrographical and Organic Geochemical Study of Eocene and Oligocene Coal Basins from Sw Bulgaria",
pages = "1-2",
doi = "10.3997/2214-4609.202333034"
}

Zdravkov, A., Gross, D., Stojanović, K., Bechtel, A.,& Kojić, I.. (2023). Comparative Petrographical and Organic Geochemical Study of Eocene and Oligocene Coal Basins from Sw Bulgaria. in 31st International Meeting on Organic Geochemistry
European Association of Geoscientists and Engineers., 1-2.
https://doi.org/10.3997/2214-4609.202333034

Zdravkov A, Gross D, Stojanović K, Bechtel A, Kojić I. Comparative Petrographical and Organic Geochemical Study of Eocene and Oligocene Coal Basins from Sw Bulgaria. in 31st International Meeting on Organic Geochemistry. 2023;:1-2.
doi:10.3997/2214-4609.202333034 .

Zdravkov, Alexander, Gross, Doris, Stojanović, Ksenija, Bechtel, Achim, Kojić, Ivan, "Comparative Petrographical and Organic Geochemical Study of Eocene and Oligocene Coal Basins from Sw Bulgaria" in 31st International Meeting on Organic Geochemistry (2023):1-2,
https://doi.org/10.3997/2214-4609.202333034 . .

TY  - CONF
AU  - Zdravkov, Alexander
AU  - Bechtel, Achim
AU  - Gross, Doris
AU  - Stojanović, Ksenija
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6403
AB  - Up to fourteen sub-bituminous coal beds are hosted within the Oligocene Bobov Dol Basin.
Among them, six (numbered I to VI from base to top) are considered economically significant.
In this study, ninety samples from five of the main seams (I-V) and a locally mined sub-seam
(Ia) were characterized by maceral analysis and ash yield determination. The coal is composed
of huminite (avg. 86.6 vol.%), liptinite (avg. 17.5 vol.%) and minor inertinite (avg: 1.5 vol.%).
Maceral composition is dominated by gymnosperm-derived telohuminite (up to 72.0 vol.%)
with resinite (up to 28.0 vol.%) and exsudatinite (up to 16.0 vol.%) cell infillings, embedded in
attrinitic (avg. 21.0 vol.%) or densinitic (avg. 17.0 vol.%) groundmass. Most samples also
contain abundant leaf-derived huminte (phyllo-huminite, up to 29.0 vol.%) in association with
cutinite (up to 8.0 vol.%) and fluorinite (up to 5.0 vol.%). Low to moderate ash yields (< 25
wt.% for most samples) coupled with low to moderate values of the maceral indices, namely
TPI < 3 (for ~80% of the samples) and GI < 3 (for >53% of the samples), and low values of the
GWI < 1 (for 81% of the samples), denote organic matter deposition within an oligo- to
mesotrophic topogenous mire with (ground)watertable beneath the peat surface. Reconstruction
of paleoenvironmental settings based on maceral analysis (Fig. 1) argues for plant matter
accumulation under marginal aquatic (seam Ia) and moderately wet- to dry-forested mires
(seams I-V). Abundance of resinite and fluorinite-rich (phyllo-)huminite indicates development
of conifer-dominated forests (likely deciduous gymnosperms), perhaps within a background of
herbaceous plants and/or deciduous shrubs. The data is compatible with the previously reported
preliminary organic geochemical data for part of the seams (Zdravkov et al., 2021).
PB  - Geological Society of Greece
C3  - Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece
C3  - Bulletin of the Geological Society Special Publication
T1  - Reconstruction of peat-forming paleoenvironments within the Oligocene Bobov Dol Basin, SW Bulgaria: Insights from organic petrology
VL  - 12
SP  - 52
EP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6403
ER  - 

@conference{
author = "Zdravkov, Alexander and Bechtel, Achim and Gross, Doris and Stojanović, Ksenija",
year = "2023",
abstract = "Up to fourteen sub-bituminous coal beds are hosted within the Oligocene Bobov Dol Basin.
Among them, six (numbered I to VI from base to top) are considered economically significant.
In this study, ninety samples from five of the main seams (I-V) and a locally mined sub-seam
(Ia) were characterized by maceral analysis and ash yield determination. The coal is composed
of huminite (avg. 86.6 vol.%), liptinite (avg. 17.5 vol.%) and minor inertinite (avg: 1.5 vol.%).
Maceral composition is dominated by gymnosperm-derived telohuminite (up to 72.0 vol.%)
with resinite (up to 28.0 vol.%) and exsudatinite (up to 16.0 vol.%) cell infillings, embedded in
attrinitic (avg. 21.0 vol.%) or densinitic (avg. 17.0 vol.%) groundmass. Most samples also
contain abundant leaf-derived huminte (phyllo-huminite, up to 29.0 vol.%) in association with
cutinite (up to 8.0 vol.%) and fluorinite (up to 5.0 vol.%). Low to moderate ash yields (< 25
wt.% for most samples) coupled with low to moderate values of the maceral indices, namely
TPI < 3 (for ~80% of the samples) and GI < 3 (for >53% of the samples), and low values of the
GWI < 1 (for 81% of the samples), denote organic matter deposition within an oligo- to
mesotrophic topogenous mire with (ground)watertable beneath the peat surface. Reconstruction
of paleoenvironmental settings based on maceral analysis (Fig. 1) argues for plant matter
accumulation under marginal aquatic (seam Ia) and moderately wet- to dry-forested mires
(seams I-V). Abundance of resinite and fluorinite-rich (phyllo-)huminite indicates development
of conifer-dominated forests (likely deciduous gymnosperms), perhaps within a background of
herbaceous plants and/or deciduous shrubs. The data is compatible with the previously reported
preliminary organic geochemical data for part of the seams (Zdravkov et al., 2021).",
publisher = "Geological Society of Greece",
journal = "Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece, Bulletin of the Geological Society Special Publication",
title = "Reconstruction of peat-forming paleoenvironments within the Oligocene Bobov Dol Basin, SW Bulgaria: Insights from organic petrology",
volume = "12",
pages = "52-52",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6403"
}

Zdravkov, A., Bechtel, A., Gross, D.,& Stojanović, K.. (2023). Reconstruction of peat-forming paleoenvironments within the Oligocene Bobov Dol Basin, SW Bulgaria: Insights from organic petrology. in Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece
Geological Society of Greece., 12, 52-52.
https://hdl.handle.net/21.15107/rcub_cherry_6403

Zdravkov A, Bechtel A, Gross D, Stojanović K. Reconstruction of peat-forming paleoenvironments within the Oligocene Bobov Dol Basin, SW Bulgaria: Insights from organic petrology. in Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece. 2023;12:52-52.
https://hdl.handle.net/21.15107/rcub_cherry_6403 .

Zdravkov, Alexander, Bechtel, Achim, Gross, Doris, Stojanović, Ksenija, "Reconstruction of peat-forming paleoenvironments within the Oligocene Bobov Dol Basin, SW Bulgaria: Insights from organic petrology" in Joint 74th ICCP and 39th TSOP Meeting 17th – 24th September 2023, Patras, Greece, 12 (2023):52-52,
https://hdl.handle.net/21.15107/rcub_cherry_6403 .

TY  - JOUR
AU  - Zdravkov, Alexander
AU  - Groß, Doris
AU  - Bechtel, Achim
AU  - Stojanović, Ksenija
AU  - Kojić, Ivan
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6288
AB  - The paper reports results from organic petrological and geochemical characterization of Suhostrel bituminous coal deposit, SW Bulgaria. Three high ash (21–47 wt%) and thin (up to 0.6 m) coal seams, representing splits from a locally compact coal bed (∼1.8 m thick), were formed around the southern and south-western rim of the Padesh Graben during its Eocene evolution. High total organic carbon contents (avg. ∼86 wt%, daf), vitrinite reflectance (avg. Ro = 1.05%) and Tmax (avg. 457 °C) argue for high vol. A/medium vol. bituminous coalification rank. Maceral composition is dominated by vitrinite (avg. ∼ 95 vol%), accompanied by small amounts of liptinite (avg. ∼ 5 vol%). Apart from few occurrences of funginite, inertinite is not present. The organic matter is mostly represented by detrovitrinite and collotelinite, the latter generally occurring in the form of gelified leaf-derived tissues. Liptinite is mainly represented by cutinite and microsporinite and display no evidence for organic matter contribution from algae. Low TPI and VI indices indicate peat formation from vegetation with poor preservation potential. Insignificant contents of gelovitrinite, coupled with high GI indices denote greater importance of the geochemical processes for the gelification of the organic matter. Striking predominance of mid- and long-chain n-alkanes argues for peat formation from a mixture of aquatic macrophytes and terrestrial vegetational communities. Presence of oleanane, albeit in low concentration, provides robust argument for contribution from angiosperm plants, whereas absence of resin-derived sesqui- and diterpenoid hydrocarbons denotes insignificant role of conifers during peat accumulation. Reconstructed depositional settings indicate organic matter accumulation under marginal aquatic, marsh/fen-type peatland with meso- to rheotrophic characteristics (GWI > 0.5). High mineral matter contents, coupled with the abundance of siliciclastic grains, imply hydrologically active environment. Plant remains deposited under oxidizing conditions (Pr/Ph = 1.5–2.5), but because of high water table were likely subjected to frequent (perhaps seasonal) changes in Eh settings. The resultant limited aerobic biodegradation of the plant remains is evidenced by low concentrations of hopanoid biomarkers and their diagenetic degradation products – drimane-type sesquiterpenoids. Post-depositional marine influence and downward infiltrating sulfate-rich waters is considered responsible for the presence of dibenzothiophene derivatives in Suhostrel coal. All molecular maturity-related ratios (e.g. CPI, Ts/(Ts + Tm), βα/(αβ + βα) C30 hopanes, ββ/(ββ + αα) C29 steranes, MPI-1, etc.) are fully compatible with the bulk geochemical parameters (e.g., TOC, Tmax, Ro) and confirm the bituminous coalification rank of the coal. Based on this data, temperatures of ∼130–140 °C were likely reached during burial of the sediments in a zone, characterized by high thermal influx (geothermal gradient ∼43–47 °C/km).
PB  - Elsevier
T2  - International Journal of Coal Geology
T1  - Depositional settings of the Eocene Suhostrel bituminous coal, SW Bulgaria, inferred from organic petrology and molecular proxies
VL  - 276
SP  - 104319
DO  - 10.1016/j.coal.2023.104319
ER  - 

@article{
author = "Zdravkov, Alexander and Groß, Doris and Bechtel, Achim and Stojanović, Ksenija and Kojić, Ivan",
year = "2023",
abstract = "The paper reports results from organic petrological and geochemical characterization of Suhostrel bituminous coal deposit, SW Bulgaria. Three high ash (21–47 wt%) and thin (up to 0.6 m) coal seams, representing splits from a locally compact coal bed (∼1.8 m thick), were formed around the southern and south-western rim of the Padesh Graben during its Eocene evolution. High total organic carbon contents (avg. ∼86 wt%, daf), vitrinite reflectance (avg. Ro = 1.05%) and Tmax (avg. 457 °C) argue for high vol. A/medium vol. bituminous coalification rank. Maceral composition is dominated by vitrinite (avg. ∼ 95 vol%), accompanied by small amounts of liptinite (avg. ∼ 5 vol%). Apart from few occurrences of funginite, inertinite is not present. The organic matter is mostly represented by detrovitrinite and collotelinite, the latter generally occurring in the form of gelified leaf-derived tissues. Liptinite is mainly represented by cutinite and microsporinite and display no evidence for organic matter contribution from algae. Low TPI and VI indices indicate peat formation from vegetation with poor preservation potential. Insignificant contents of gelovitrinite, coupled with high GI indices denote greater importance of the geochemical processes for the gelification of the organic matter. Striking predominance of mid- and long-chain n-alkanes argues for peat formation from a mixture of aquatic macrophytes and terrestrial vegetational communities. Presence of oleanane, albeit in low concentration, provides robust argument for contribution from angiosperm plants, whereas absence of resin-derived sesqui- and diterpenoid hydrocarbons denotes insignificant role of conifers during peat accumulation. Reconstructed depositional settings indicate organic matter accumulation under marginal aquatic, marsh/fen-type peatland with meso- to rheotrophic characteristics (GWI > 0.5). High mineral matter contents, coupled with the abundance of siliciclastic grains, imply hydrologically active environment. Plant remains deposited under oxidizing conditions (Pr/Ph = 1.5–2.5), but because of high water table were likely subjected to frequent (perhaps seasonal) changes in Eh settings. The resultant limited aerobic biodegradation of the plant remains is evidenced by low concentrations of hopanoid biomarkers and their diagenetic degradation products – drimane-type sesquiterpenoids. Post-depositional marine influence and downward infiltrating sulfate-rich waters is considered responsible for the presence of dibenzothiophene derivatives in Suhostrel coal. All molecular maturity-related ratios (e.g. CPI, Ts/(Ts + Tm), βα/(αβ + βα) C30 hopanes, ββ/(ββ + αα) C29 steranes, MPI-1, etc.) are fully compatible with the bulk geochemical parameters (e.g., TOC, Tmax, Ro) and confirm the bituminous coalification rank of the coal. Based on this data, temperatures of ∼130–140 °C were likely reached during burial of the sediments in a zone, characterized by high thermal influx (geothermal gradient ∼43–47 °C/km).",
publisher = "Elsevier",
journal = "International Journal of Coal Geology",
title = "Depositional settings of the Eocene Suhostrel bituminous coal, SW Bulgaria, inferred from organic petrology and molecular proxies",
volume = "276",
pages = "104319",
doi = "10.1016/j.coal.2023.104319"
}

Zdravkov, A., Groß, D., Bechtel, A., Stojanović, K.,& Kojić, I.. (2023). Depositional settings of the Eocene Suhostrel bituminous coal, SW Bulgaria, inferred from organic petrology and molecular proxies. in International Journal of Coal Geology
Elsevier., 276, 104319.
https://doi.org/10.1016/j.coal.2023.104319

Zdravkov A, Groß D, Bechtel A, Stojanović K, Kojić I. Depositional settings of the Eocene Suhostrel bituminous coal, SW Bulgaria, inferred from organic petrology and molecular proxies. in International Journal of Coal Geology. 2023;276:104319.
doi:10.1016/j.coal.2023.104319 .

Zdravkov, Alexander, Groß, Doris, Bechtel, Achim, Stojanović, Ksenija, Kojić, Ivan, "Depositional settings of the Eocene Suhostrel bituminous coal, SW Bulgaria, inferred from organic petrology and molecular proxies" in International Journal of Coal Geology, 276 (2023):104319,
https://doi.org/10.1016/j.coal.2023.104319 . .

TY  - CONF
AU  - Kojić, Ivan
AU  - Stojanović, Ksenija A.
AU  - Radović, Nebojša R.
AU  - Tosti, Tomislav
AU  - Đurović, Saša
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5912
AB  - У индустријској зони града Ковина налазe се фабрике које се баве производњом алкохола и сточног квасца, хране за кућне љубимце, сечењем и завршном обрадом челика, производњом шприцева и амбалаже за вакцине и лекове, као и највећа на Балкану фарма печурака. Поред тога, на 11 km од Ковина је рудник који угаљ вади са дна језера које је повезано са Дунавом, и представља јединствену подводну експлоатацију угља на свету. Упркос наведеним бројним делатностима које могу имати утицаја на квалитет површинских вода, нема лабораторије која се бави њиховим мониторингом. Стога је циљ овог рада прелиминарна карактеризација степена оптерећења површинских вода укупно присутним и специфичним, најзаступљенијим угљоводоничним загађујућим супстанцама. Узорци коришћени у раду узети су током новембра 2022. године, са пет репрезентативних локација на подручју Ковина (слика 1). Након одређивања основних параметара (табела 1), воде су анализиране применом стандардне методе ASTM D1252-06 [1], како би се утврдиле вредности хемијске потрошње кисеоника (ХПК). У циљу специфицирања најзаступљенијих угљоводоничних загађујућих супстанци, примењена је екстракција узорака вода помоћу трихлорметана. Добијени екстракти су након сушења и концентровања хроматографски пречишћени и анализирани на гасном хроматографу Agilent 7890A GC куплованом са квадруполним масеним детектором Agilent 5975C. Четири од пет анализираних узорака показују вредности ХПК карактеристичне за класу III површинских вода (табела 1; [2]). Најзаступљeнија специфична угљоводонична једињења у свим узорцима су n-алкани (слика 1). Нижи n-алкани са мање од 20 угљеникових атома су присутни само у траговима, што указује да ове воде углавном нису изложене загађењу сировом нафтом, дизелом или керозином. У три узорка (Дунавац, Шљункара и Црна Бара), CPI вредности за цео опсег n-алкана (С16- С34), као и за и више (С25-С34) и ниже (С15-С20, са изузетком Шљункаре) n-алканске хомологе су ниже или блиске 1, што уз n-алканске максимуме у опсегу С24-С26 указује на допринос органске супстанце акватичних макрофита, бактерија, васкуларних биљака и маховина рода Sphagnum [3]. Присуство нижих n-алкана (С15-С20) карактерише алге и бактерије, док се доминација непарних нижих хомолога у узорку Шљункара може повезати за цијанобактеријама. У узорицима Канал и Поњавица CPI вредности за цео опсег n-алкана (С16-С34), као и за више хомологе (С25-С34) веће су од 1, што уз n-алкански максимум у узорку Канал на С27 указује на допринос виших сувоземних биљака. Међутим поред наведених природних извора идентификованих n-алкана, треба истаћи да веома сличне n-алканске расподеле имају моторна уља, теже фракције уља за ложење и течни производи пиролизе лигнита. Од посебног значаја је и резултат да је у екстракту узорка воде са локације Поњавица доминантно једињење елементарни сумпор (слика 1), што се може повезати са великом количином муља у којем преовлађују аноксични услови, услед чега су фаворизовани редукциони хемијски/биохемијски процеси. Резултати прелиминарног истраживања показују да је неопходно наставити континуално и знатно детаљније истраживање предметних вода, како би се предупредило њихово даље загађење и негативан утицај на живи свет у њима, као и на подземне воде и земљиште у непосредној околини.
PB  - Belgrade : Serbian Chemical Society
C3  - 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023
T1  - Процена степена оптерећења површинских вода органским загађујућим супстанцама на подручју Ковина, Србија
T1  - Estimation of surface water contamination by organic pollutants in the Kovin area, Serbia
SP  - 91
EP  - 92
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5912
ER  - 

@conference{
author = "Kojić, Ivan and Stojanović, Ksenija A. and Radović, Nebojša R. and Tosti, Tomislav and Đurović, Saša",
year = "2023",
abstract = "У индустријској зони града Ковина налазe се фабрике које се баве производњом алкохола и сточног квасца, хране за кућне љубимце, сечењем и завршном обрадом челика, производњом шприцева и амбалаже за вакцине и лекове, као и највећа на Балкану фарма печурака. Поред тога, на 11 km од Ковина је рудник који угаљ вади са дна језера које је повезано са Дунавом, и представља јединствену подводну експлоатацију угља на свету. Упркос наведеним бројним делатностима које могу имати утицаја на квалитет површинских вода, нема лабораторије која се бави њиховим мониторингом. Стога је циљ овог рада прелиминарна карактеризација степена оптерећења површинских вода укупно присутним и специфичним, најзаступљенијим угљоводоничним загађујућим супстанцама. Узорци коришћени у раду узети су током новембра 2022. године, са пет репрезентативних локација на подручју Ковина (слика 1). Након одређивања основних параметара (табела 1), воде су анализиране применом стандардне методе ASTM D1252-06 [1], како би се утврдиле вредности хемијске потрошње кисеоника (ХПК). У циљу специфицирања најзаступљенијих угљоводоничних загађујућих супстанци, примењена је екстракција узорака вода помоћу трихлорметана. Добијени екстракти су након сушења и концентровања хроматографски пречишћени и анализирани на гасном хроматографу Agilent 7890A GC куплованом са квадруполним масеним детектором Agilent 5975C. Четири од пет анализираних узорака показују вредности ХПК карактеристичне за класу III површинских вода (табела 1; [2]). Најзаступљeнија специфична угљоводонична једињења у свим узорцима су n-алкани (слика 1). Нижи n-алкани са мање од 20 угљеникових атома су присутни само у траговима, што указује да ове воде углавном нису изложене загађењу сировом нафтом, дизелом или керозином. У три узорка (Дунавац, Шљункара и Црна Бара), CPI вредности за цео опсег n-алкана (С16- С34), као и за и више (С25-С34) и ниже (С15-С20, са изузетком Шљункаре) n-алканске хомологе су ниже или блиске 1, што уз n-алканске максимуме у опсегу С24-С26 указује на допринос органске супстанце акватичних макрофита, бактерија, васкуларних биљака и маховина рода Sphagnum [3]. Присуство нижих n-алкана (С15-С20) карактерише алге и бактерије, док се доминација непарних нижих хомолога у узорку Шљункара може повезати за цијанобактеријама. У узорицима Канал и Поњавица CPI вредности за цео опсег n-алкана (С16-С34), као и за више хомологе (С25-С34) веће су од 1, што уз n-алкански максимум у узорку Канал на С27 указује на допринос виших сувоземних биљака. Међутим поред наведених природних извора идентификованих n-алкана, треба истаћи да веома сличне n-алканске расподеле имају моторна уља, теже фракције уља за ложење и течни производи пиролизе лигнита. Од посебног значаја је и резултат да је у екстракту узорка воде са локације Поњавица доминантно једињење елементарни сумпор (слика 1), што се може повезати са великом количином муља у којем преовлађују аноксични услови, услед чега су фаворизовани редукциони хемијски/биохемијски процеси. Резултати прелиминарног истраживања показују да је неопходно наставити континуално и знатно детаљније истраживање предметних вода, како би се предупредило њихово даље загађење и негативан утицај на живи свет у њима, као и на подземне воде и земљиште у непосредној околини.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023",
title = "Процена степена оптерећења површинских вода органским загађујућим супстанцама на подручју Ковина, Србија, Estimation of surface water contamination by organic pollutants in the Kovin area, Serbia",
pages = "91-92",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5912"
}

Kojić, I., Stojanović, K. A., Radović, N. R., Tosti, T.,& Đurović, S.. (2023). Процена степена оптерећења површинских вода органским загађујућим супстанцама на подручју Ковина, Србија. in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023
Belgrade : Serbian Chemical Society., 91-92.
https://hdl.handle.net/21.15107/rcub_cherry_5912

Kojić I, Stojanović KA, Radović NR, Tosti T, Đurović S. Процена степена оптерећења површинских вода органским загађујућим супстанцама на подручју Ковина, Србија. in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023. 2023;:91-92.
https://hdl.handle.net/21.15107/rcub_cherry_5912 .

Kojić, Ivan, Stojanović, Ksenija A., Radović, Nebojša R., Tosti, Tomislav, Đurović, Saša, "Процена степена оптерећења површинских вода органским загађујућим супстанцама на подручју Ковина, Србија" in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023 (2023):91-92,
https://hdl.handle.net/21.15107/rcub_cherry_5912 .

TY  - CONF
AU  - Radović, Nebojša R.
AU  - Nikolić, Željka M.
AU  - Stojanović, Ksenija A.
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6054
AB  - • Introduction and scope
Sulfur dioxide (SO2) is a widespread pollutant gas that releases during many industrial processes [1].
SO2 has significant environmental and health implications [2], making its accurate quantification
essential. The aim of this paper was to develop a simple and efficient laboratory-scale method for the
sampling and quantification of SO2 at its source.
• Methodology
SO2, generated in the reaction between sodium metabisulfite and orthophosphoric acid, was routed
through a condenser to a recipient vessel containing an absorptive solution of sodium hydroxide. The
absorption of the SO2 was performed with a consistent gas flow rate, facilitated by the use of a vacuum
pump within the reaction system. Aqueous solution of potassium dichloroiodate(I) [3] was employed
for volumetric determination of sulfite content in the final absorptive solution.
• Results
Based on the results of sulfite content determination in the final absorptive solution, which exhibited an
analytical recovery of SO2 ranging from 83% to 96%, the effectiveness of the proposed method is
demonstrated.
• Conclusion
According to the obtained results and the multifaceted challenges associated with the sampling of
gaseous fluids, this study can serve as a valuable guideline for the sampling of gaseous mixtures
containing SO2. Usage of a vacuum pump in the sampling system helps minimize the loss of gaseous
components in the final absorptive solution, whereas the described titrimetric method enables a simple
and efficient analytical procedure for determining SO2 content. Further research and refinement of this
method could lead to its practical application in environmental monitoring and industrial processes.
PB  - University of Belgrade - Technical Faculty in Bor, Serbia
C3  - 8th International Student Conference on Technical Sciences ISC 2023, Book of Abstracts
T1  - Capturing Sulfur Dioxide at Its Source: Simple and Efficient Method for Sampling and Quantification
SP  - 27
EP  - 27
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6054
ER  - 

@conference{
author = "Radović, Nebojša R. and Nikolić, Željka M. and Stojanović, Ksenija A.",
year = "2023",
abstract = "• Introduction and scope
Sulfur dioxide (SO2) is a widespread pollutant gas that releases during many industrial processes [1].
SO2 has significant environmental and health implications [2], making its accurate quantification
essential. The aim of this paper was to develop a simple and efficient laboratory-scale method for the
sampling and quantification of SO2 at its source.
• Methodology
SO2, generated in the reaction between sodium metabisulfite and orthophosphoric acid, was routed
through a condenser to a recipient vessel containing an absorptive solution of sodium hydroxide. The
absorption of the SO2 was performed with a consistent gas flow rate, facilitated by the use of a vacuum
pump within the reaction system. Aqueous solution of potassium dichloroiodate(I) [3] was employed
for volumetric determination of sulfite content in the final absorptive solution.
• Results
Based on the results of sulfite content determination in the final absorptive solution, which exhibited an
analytical recovery of SO2 ranging from 83% to 96%, the effectiveness of the proposed method is
demonstrated.
• Conclusion
According to the obtained results and the multifaceted challenges associated with the sampling of
gaseous fluids, this study can serve as a valuable guideline for the sampling of gaseous mixtures
containing SO2. Usage of a vacuum pump in the sampling system helps minimize the loss of gaseous
components in the final absorptive solution, whereas the described titrimetric method enables a simple
and efficient analytical procedure for determining SO2 content. Further research and refinement of this
method could lead to its practical application in environmental monitoring and industrial processes.",
publisher = "University of Belgrade - Technical Faculty in Bor, Serbia",
journal = "8th International Student Conference on Technical Sciences ISC 2023, Book of Abstracts",
title = "Capturing Sulfur Dioxide at Its Source: Simple and Efficient Method for Sampling and Quantification",
pages = "27-27",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6054"
}

Radović, N. R., Nikolić, Ž. M.,& Stojanović, K. A.. (2023). Capturing Sulfur Dioxide at Its Source: Simple and Efficient Method for Sampling and Quantification. in 8th International Student Conference on Technical Sciences ISC 2023, Book of Abstracts
University of Belgrade - Technical Faculty in Bor, Serbia., 27-27.
https://hdl.handle.net/21.15107/rcub_cherry_6054

Radović NR, Nikolić ŽM, Stojanović KA. Capturing Sulfur Dioxide at Its Source: Simple and Efficient Method for Sampling and Quantification. in 8th International Student Conference on Technical Sciences ISC 2023, Book of Abstracts. 2023;:27-27.
https://hdl.handle.net/21.15107/rcub_cherry_6054 .

Radović, Nebojša R., Nikolić, Željka M., Stojanović, Ksenija A., "Capturing Sulfur Dioxide at Its Source: Simple and Efficient Method for Sampling and Quantification" in 8th International Student Conference on Technical Sciences ISC 2023, Book of Abstracts (2023):27-27,
https://hdl.handle.net/21.15107/rcub_cherry_6054 .

TY  - CONF
AU  - Kojić, Ivan
AU  - Stojanović, Ksenija A.
AU  - Radović, Nebojša R.
AU  - Đurović, Saša
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5927
AB  - Испитивање угљоводоника у ваздуху претежно обухвата лакоиспарљива једињења и полицикличне ароматичне угљоводонике, док се мање пажње посвећује n-алканима дугог низа. Антропогено порекло виших n-алкана углавном се приписује угљу, биомаси, моторним уљима и уљима за ложење, док је њихово биогено порекло резултат физиолошких процеса виших сувоземних биљака, као и појединих микроорганизама. Виши n-алкани (>С20) су стабилна, неиспарљива, у води нерастворна једињења, те се у ваздуху претежно налазе адсоpбовани на честицама, и то углавном PM2.5. Стога је значајно да се ова једињења у ваздуху анализирају и да се детаљније расветли њихова хемодинамика. Циљ овога рада је испитивање брзе и јефтине методе за екстракцију виших n-алкана из ваздуха, при чему су као растварачи коришћени n-хексан и дихлорметан. Наведени растварачи су одабрани због способности да добро растварају угљоводонике и економске приступачности. Узорци ваздуха узети су са висине од 2 метра, мерено од асфалта, на локацији Капетан Мишине улице у Београду. Ова улица се налази у центру града, умерено је оптерећена само аутомобилским саобраћајем, али је транспорт знатно мање интензиван него на аутопуту и прометним саобраћајницама кроз које се крећу возила градског превоза. Ваздух је помоћу аутоматског узоркивача са пумпом на електрични погон, уз константан проток, увођен у стаклену испиралицу напуњену прописаним количинама n-хексана, односно дихлорметана. Након дефинисаног времена узорковања, из добијених екстраката је најпре уклоњена влага, а потом су концентровани на ротационом вакуум упаривачу. Добијени концентрати су пречишћени на хроматографској колони са активираним магнезијум-силикатом и анализирани на гасном хроматографу Agilent 7890A GC куплованом са квадруполним масеним детектором Agilent 5975C. На слици 1 приказан је хроматограм виших n-алкана у узорку екстрахованом дихлорметаном, који је показао већи апсорпциони потенцијал у односу на n-хексан, при идентичним експерименталним условима. У екстрактима ваздуха идентификовани су виши n-алкани у опсегу од C21 до C32. CPI (Carbon Preference Index) вредности за цео опсег n-алкана (С21-С31) износиле су 0,99. n-Алканске расподеле се карактеришу највећом заступљеношћу хомолога С23-С26, са максимумима на С24 и С25. Веома сличне n-алканске расподеле са уједначеном заступљеношћу парних и непарних хомолога имају моторна уља, теже фракције уља за ложење и течни производи пиролизе лигнита. Природни извори С23-С26 алкана су акватичне макрофите, бактерије, васкуларне биљке и маховине рода Sphagnum. Непарни n-алкани С27-С31 карактеристични су за више сувоземне биљке, при чему се доминација С27 и С29 углавном везује за дрвеће и жбуње, а С31 за траве и маховине. Добијени резултати показују да је коришћени експериментални поступак екстракције дихлорметаном ефикасан за анализу виших n-алкана у ваздуху. Поред тога, у питању је брза, јефтина метода, која је креирана тако да захтева минималан број аналитичких фаза, чиме се губици аналита своде на најмању меру, што је важно узимајући у обзир њихову ниску концентрацију у ваздуху. Резултати испитивања су основа за наставак истраживања, у циљу оптимизације методе за екстракцију и квантификацију виших n-алкана у узорцима ваздуха.
PB  - Belgrade : Serbian Chemical Society
C3  - 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023
T1  - Испитивање ефикасности екстракције виших n-алкана из ваздуха
T1  - Investigation of the efficiency of extraction of long-chain n-alkanes from air
SP  - 92
EP  - 94
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5927
ER  - 

@conference{
author = "Kojić, Ivan and Stojanović, Ksenija A. and Radović, Nebojša R. and Đurović, Saša",
year = "2023",
abstract = "Испитивање угљоводоника у ваздуху претежно обухвата лакоиспарљива једињења и полицикличне ароматичне угљоводонике, док се мање пажње посвећује n-алканима дугог низа. Антропогено порекло виших n-алкана углавном се приписује угљу, биомаси, моторним уљима и уљима за ложење, док је њихово биогено порекло резултат физиолошких процеса виших сувоземних биљака, као и појединих микроорганизама. Виши n-алкани (>С20) су стабилна, неиспарљива, у води нерастворна једињења, те се у ваздуху претежно налазе адсоpбовани на честицама, и то углавном PM2.5. Стога је значајно да се ова једињења у ваздуху анализирају и да се детаљније расветли њихова хемодинамика. Циљ овога рада је испитивање брзе и јефтине методе за екстракцију виших n-алкана из ваздуха, при чему су као растварачи коришћени n-хексан и дихлорметан. Наведени растварачи су одабрани због способности да добро растварају угљоводонике и економске приступачности. Узорци ваздуха узети су са висине од 2 метра, мерено од асфалта, на локацији Капетан Мишине улице у Београду. Ова улица се налази у центру града, умерено је оптерећена само аутомобилским саобраћајем, али је транспорт знатно мање интензиван него на аутопуту и прометним саобраћајницама кроз које се крећу возила градског превоза. Ваздух је помоћу аутоматског узоркивача са пумпом на електрични погон, уз константан проток, увођен у стаклену испиралицу напуњену прописаним количинама n-хексана, односно дихлорметана. Након дефинисаног времена узорковања, из добијених екстраката је најпре уклоњена влага, а потом су концентровани на ротационом вакуум упаривачу. Добијени концентрати су пречишћени на хроматографској колони са активираним магнезијум-силикатом и анализирани на гасном хроматографу Agilent 7890A GC куплованом са квадруполним масеним детектором Agilent 5975C. На слици 1 приказан је хроматограм виших n-алкана у узорку екстрахованом дихлорметаном, који је показао већи апсорпциони потенцијал у односу на n-хексан, при идентичним експерименталним условима. У екстрактима ваздуха идентификовани су виши n-алкани у опсегу од C21 до C32. CPI (Carbon Preference Index) вредности за цео опсег n-алкана (С21-С31) износиле су 0,99. n-Алканске расподеле се карактеришу највећом заступљеношћу хомолога С23-С26, са максимумима на С24 и С25. Веома сличне n-алканске расподеле са уједначеном заступљеношћу парних и непарних хомолога имају моторна уља, теже фракције уља за ложење и течни производи пиролизе лигнита. Природни извори С23-С26 алкана су акватичне макрофите, бактерије, васкуларне биљке и маховине рода Sphagnum. Непарни n-алкани С27-С31 карактеристични су за више сувоземне биљке, при чему се доминација С27 и С29 углавном везује за дрвеће и жбуње, а С31 за траве и маховине. Добијени резултати показују да је коришћени експериментални поступак екстракције дихлорметаном ефикасан за анализу виших n-алкана у ваздуху. Поред тога, у питању је брза, јефтина метода, која је креирана тако да захтева минималан број аналитичких фаза, чиме се губици аналита своде на најмању меру, што је важно узимајући у обзир њихову ниску концентрацију у ваздуху. Резултати испитивања су основа за наставак истраживања, у циљу оптимизације методе за екстракцију и квантификацију виших n-алкана у узорцима ваздуха.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023",
title = "Испитивање ефикасности екстракције виших n-алкана из ваздуха, Investigation of the efficiency of extraction of long-chain n-alkanes from air",
pages = "92-94",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5927"
}

Kojić, I., Stojanović, K. A., Radović, N. R.,& Đurović, S.. (2023). Испитивање ефикасности екстракције виших n-алкана из ваздуха. in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023
Belgrade : Serbian Chemical Society., 92-94.
https://hdl.handle.net/21.15107/rcub_cherry_5927

Kojić I, Stojanović KA, Radović NR, Đurović S. Испитивање ефикасности екстракције виших n-алкана из ваздуха. in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023. 2023;:92-94.
https://hdl.handle.net/21.15107/rcub_cherry_5927 .

Kojić, Ivan, Stojanović, Ksenija A., Radović, Nebojša R., Đurović, Saša, "Испитивање ефикасности екстракције виших n-алкана из ваздуха" in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023 (2023):92-94,
https://hdl.handle.net/21.15107/rcub_cherry_5927 .

TY  - CONF
AU  - Radović, Nebojša R.
AU  - Stojanović, Ksenija A.
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6053
AB  - Introduction: Metabolites from Curcuma longa show pH-dependent color-changing properties. During
this study, test strips were developed using Curcuma longa metabolites, which enable the rapid estima-
tion of acidity/alkalinity in natural and artificial samples.
Methods: Commercially available Curcuma longa powder (5.00 g) was mixed with ethanol (45 mL) and
subjected to 30 minutes of ultrasonic extraction. After 60 minutes of settling, the resulting suspension
was filtered and supplemented with ethanol to reach a final volume of 50 mL. Circular pieces of filter
paper were immersed in 15 mL of the colored filtrate in Petri dishes for 10 minutes. The impregnated
pieces of filter paper were then dried at 65°C for 10 minutes and cut into desired rectangular shapes.
Results: Analysis of the prepared test strips’ behavior was conducted across a pH range from 0 to 14, en-
compassing various solutions (HCl, NaOH, and buffered solutions) whose pH values were measured by
a pH meter. The test strips exhibited a yellow-orange color at pH values below 8.5, while a brown color
was observed at pH values of 8.5 and above.
Conclusion: The experimental data obtained in this investigation demonstrate significant agreement
with the literature value for the first pKa of curcumin (pKa1=8.4), a compound displaying the distinctive
orange color found in dry Curcuma longa powder, and possessing pH-dependent color-changing char-
acteristics. Therefore, test strips prepared from an ethanolic extract of Curcuma longa powder constitute
a promising tool for the routine assessment of acidity/alkalinity across various samples in molecular bi-
ology, (bio)chemistry, pharmacy, medicine, and related fields.
PB  - Institute of Molecular Genetics and Genetic Engineering (IMGGE), University of Belgrade
C3  - CoMBoS2 – the Second Congress of Molecular Biologists of Serbia, Abstract Book – Trends in Molecular Biology, Special issue
T1  - Utilizing metabolites from curcuma longa for the development of ph-responsive test strips
SP  - 164
EP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6053
ER  - 

@conference{
author = "Radović, Nebojša R. and Stojanović, Ksenija A.",
year = "2023",
abstract = "Introduction: Metabolites from Curcuma longa show pH-dependent color-changing properties. During
this study, test strips were developed using Curcuma longa metabolites, which enable the rapid estima-
tion of acidity/alkalinity in natural and artificial samples.
Methods: Commercially available Curcuma longa powder (5.00 g) was mixed with ethanol (45 mL) and
subjected to 30 minutes of ultrasonic extraction. After 60 minutes of settling, the resulting suspension
was filtered and supplemented with ethanol to reach a final volume of 50 mL. Circular pieces of filter
paper were immersed in 15 mL of the colored filtrate in Petri dishes for 10 minutes. The impregnated
pieces of filter paper were then dried at 65°C for 10 minutes and cut into desired rectangular shapes.
Results: Analysis of the prepared test strips’ behavior was conducted across a pH range from 0 to 14, en-
compassing various solutions (HCl, NaOH, and buffered solutions) whose pH values were measured by
a pH meter. The test strips exhibited a yellow-orange color at pH values below 8.5, while a brown color
was observed at pH values of 8.5 and above.
Conclusion: The experimental data obtained in this investigation demonstrate significant agreement
with the literature value for the first pKa of curcumin (pKa1=8.4), a compound displaying the distinctive
orange color found in dry Curcuma longa powder, and possessing pH-dependent color-changing char-
acteristics. Therefore, test strips prepared from an ethanolic extract of Curcuma longa powder constitute
a promising tool for the routine assessment of acidity/alkalinity across various samples in molecular bi-
ology, (bio)chemistry, pharmacy, medicine, and related fields.",
publisher = "Institute of Molecular Genetics and Genetic Engineering (IMGGE), University of Belgrade",
journal = "CoMBoS2 – the Second Congress of Molecular Biologists of Serbia, Abstract Book – Trends in Molecular Biology, Special issue",
title = "Utilizing metabolites from curcuma longa for the development of ph-responsive test strips",
pages = "164-164",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6053"
}

Radović, N. R.,& Stojanović, K. A.. (2023). Utilizing metabolites from curcuma longa for the development of ph-responsive test strips. in CoMBoS2 – the Second Congress of Molecular Biologists of Serbia, Abstract Book – Trends in Molecular Biology, Special issue
Institute of Molecular Genetics and Genetic Engineering (IMGGE), University of Belgrade., 164-164.
https://hdl.handle.net/21.15107/rcub_cherry_6053

Radović NR, Stojanović KA. Utilizing metabolites from curcuma longa for the development of ph-responsive test strips. in CoMBoS2 – the Second Congress of Molecular Biologists of Serbia, Abstract Book – Trends in Molecular Biology, Special issue. 2023;:164-164.
https://hdl.handle.net/21.15107/rcub_cherry_6053 .

Radović, Nebojša R., Stojanović, Ksenija A., "Utilizing metabolites from curcuma longa for the development of ph-responsive test strips" in CoMBoS2 – the Second Congress of Molecular Biologists of Serbia, Abstract Book – Trends in Molecular Biology, Special issue (2023):164-164,
https://hdl.handle.net/21.15107/rcub_cherry_6053 .

TY  - GEN
AU  - Савић, Слађана Д.
AU  - Стојановић, Ксенија А.
AU  - Радовић, Небојша Р.
PY  - 2023
UR  - https://shd.org.rs/index.php/nastava/aprilski-dani
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5914
AB  - Берлинско плаво, познато и као пруско плаво је један од најпознатијих пигмената, који се користи више од 300 година као састојак уљаних и водених боја у сликарству. По хемијском саставу и у зависности од количине примењених реактаната током синтезе, берлинско плаво може бити калијум-гвожђе(III)-хексацијаноферат(II) или гвожђе(III)-хексацијаноферат(II). У стручној литератури се може пронаћи велики број индустријских и лабораторијских метода за добијање берлинског плавог, које се могу поделити на директне и индиректне. Будући да синтеза поменутог пигмента не изискује употребу софистицираних и скупих инструмената и уређаја, иста је подесна за извођење у средњошколским кабинетима хемије. Аутори овог рада предлажу наставницима хемије да синтезу берлинског плавог ученици реализују применом директне методе, која jе базирана на поступку континуираног додавања раствора гвожђе(III)-хлорида у раствор калијум-хексацијаноферата(II). Са апекта наставе хемије, синтеза берлинског плавог представља ефектан пример на којем је могуће, поред вежбања лабораторијског рада, утврдити и унапредити знања ученика из различитих области хемије као што су: раствори, стехиометријска израчунавања, координациона и примењена хемија. Како наведена синтеза берлинског плавог не би била сама себи циљ, неопходно јој је додати контекст употребне вредности што ће ученицима помоћи да разумеју оправданост теоријских принципа хемијске науке и њених често компликованих законитости које се као градиво постављају пред њих. Управо из овог разлога, аутори рада охрабрују наставнике хемије да ученицима предложе да, након успешно реализованог поступка синтезе берлинског плавог на часовима хемије, добијени пигмент искористе за потребе сликања током похађања наставе ликовне уметности. На овај начин, код ученика се повећава разумевање интеграција различитих знања, која у садејству омогућавају, олакшавају и унапређују живот и развој људског друштва.
PB  - Београд : Српско хемијско друштво
T2  - Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.
T1  - Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5914
ER  - 

@misc{
author = "Савић, Слађана Д. and Стојановић, Ксенија А. and Радовић, Небојша Р.",
year = "2023",
abstract = "Берлинско плаво, познато и као пруско плаво је један од најпознатијих пигмената, који се користи више од 300 година као састојак уљаних и водених боја у сликарству. По хемијском саставу и у зависности од количине примењених реактаната током синтезе, берлинско плаво може бити калијум-гвожђе(III)-хексацијаноферат(II) или гвожђе(III)-хексацијаноферат(II). У стручној литератури се може пронаћи велики број индустријских и лабораторијских метода за добијање берлинског плавог, које се могу поделити на директне и индиректне. Будући да синтеза поменутог пигмента не изискује употребу софистицираних и скупих инструмената и уређаја, иста је подесна за извођење у средњошколским кабинетима хемије. Аутори овог рада предлажу наставницима хемије да синтезу берлинског плавог ученици реализују применом директне методе, која jе базирана на поступку континуираног додавања раствора гвожђе(III)-хлорида у раствор калијум-хексацијаноферата(II). Са апекта наставе хемије, синтеза берлинског плавог представља ефектан пример на којем је могуће, поред вежбања лабораторијског рада, утврдити и унапредити знања ученика из различитих области хемије као што су: раствори, стехиометријска израчунавања, координациона и примењена хемија. Како наведена синтеза берлинског плавог не би била сама себи циљ, неопходно јој је додати контекст употребне вредности што ће ученицима помоћи да разумеју оправданост теоријских принципа хемијске науке и њених често компликованих законитости које се као градиво постављају пред њих. Управо из овог разлога, аутори рада охрабрују наставнике хемије да ученицима предложе да, након успешно реализованог поступка синтезе берлинског плавог на часовима хемије, добијени пигмент искористе за потребе сликања током похађања наставе ликовне уметности. На овај начин, код ученика се повећава разумевање интеграција различитих знања, која у садејству омогућавају, олакшавају и унапређују живот и развој људског друштва.",
publisher = "Београд : Српско хемијско друштво",
journal = "Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.",
title = "Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5914"
}

Савић, С. Д., Стојановић, К. А.,& Радовић, Н. Р.. (2023). Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена. in Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.
Београд : Српско хемијско друштво..
https://hdl.handle.net/21.15107/rcub_cherry_5914

Савић СД, Стојановић КА, Радовић НР. Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена. in Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.. 2023;.
https://hdl.handle.net/21.15107/rcub_cherry_5914 .

Савић, Слађана Д., Стојановић, Ксенија А., Радовић, Небојша Р., "Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена" in Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023. (2023),
https://hdl.handle.net/21.15107/rcub_cherry_5914 .

TY  - CONF
AU  - Савић, Слађана Д.
AU  - Стојановић, Ксенија А.
AU  - Радовић, Небојша Р.
PY  - 2023
UR  - https://shd.org.rs/index.php/nastava/aprilski-dani
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5913
AB  - Берлинско плаво, познато и као пруско плаво је један од најпознатијих пигмената, који се користи више од 300 година као састојак уљаних и водених боја у сликарству. По хемијском саставу и у зависности од количине примењених реактаната током синтезе, берлинско плаво може бити калијум-гвожђе(III)-хексацијаноферат(II) или гвожђе(III)-хексацијаноферат(II). У стручној литератури се може пронаћи велики број индустријских и лабораторијских метода за добијање берлинског плавог, које се могу поделити на директне и индиректне. Будући да синтеза поменутог пигмента не изискује употребу софистицираних и скупих инструмената и уређаја, иста је подесна за извођење у средњошколским кабинетима хемије. Аутори овог рада предлажу наставницима хемије да синтезу берлинског плавог ученици реализују применом директне методе, која jе базирана на поступку континуираног додавања раствора гвожђе(III)-хлорида у раствор калијум-хексацијаноферата(II). Са апекта наставе хемије, синтеза берлинског плавог представља ефектан пример на којем је могуће, поред вежбања лабораторијског рада, утврдити и унапредити знања ученика из различитих области хемије као што су: раствори, стехиометријска израчунавања, координациона и примењена хемија. Како наведена синтеза берлинског плавог не би била сама себи циљ, неопходно јој је додати контекст употребне вредности што ће ученицима помоћи да разумеју оправданост теоријских принципа хемијске науке и њених често компликованих законитости које се као градиво постављају пред њих. Управо из овог разлога, аутори рада охрабрују наставнике хемије да ученицима предложе да, након успешно реализованог поступка синтезе берлинског плавог на часовима хемије, добијени пигмент искористе за потребе сликања током похађања наставе ликовне уметности. На овај начин, код ученика се повећава разумевање интеграција различитих знања, која у садејству омогућавају, олакшавају и унапређују живот и развој људског друштва.
PB  - Београд : Српско хемијско друштво
C3  - Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.
T1  - Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена
IS  - 32
SP  - 29
EP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5913
ER  - 

@conference{
author = "Савић, Слађана Д. and Стојановић, Ксенија А. and Радовић, Небојша Р.",
year = "2023",
abstract = "Берлинско плаво, познато и као пруско плаво је један од најпознатијих пигмената, који се користи више од 300 година као састојак уљаних и водених боја у сликарству. По хемијском саставу и у зависности од количине примењених реактаната током синтезе, берлинско плаво може бити калијум-гвожђе(III)-хексацијаноферат(II) или гвожђе(III)-хексацијаноферат(II). У стручној литератури се може пронаћи велики број индустријских и лабораторијских метода за добијање берлинског плавог, које се могу поделити на директне и индиректне. Будући да синтеза поменутог пигмента не изискује употребу софистицираних и скупих инструмената и уређаја, иста је подесна за извођење у средњошколским кабинетима хемије. Аутори овог рада предлажу наставницима хемије да синтезу берлинског плавог ученици реализују применом директне методе, која jе базирана на поступку континуираног додавања раствора гвожђе(III)-хлорида у раствор калијум-хексацијаноферата(II). Са апекта наставе хемије, синтеза берлинског плавог представља ефектан пример на којем је могуће, поред вежбања лабораторијског рада, утврдити и унапредити знања ученика из различитих области хемије као што су: раствори, стехиометријска израчунавања, координациона и примењена хемија. Како наведена синтеза берлинског плавог не би била сама себи циљ, неопходно јој је додати контекст употребне вредности што ће ученицима помоћи да разумеју оправданост теоријских принципа хемијске науке и њених често компликованих законитости које се као градиво постављају пред њих. Управо из овог разлога, аутори рада охрабрују наставнике хемије да ученицима предложе да, након успешно реализованог поступка синтезе берлинског плавог на часовима хемије, добијени пигмент искористе за потребе сликања током похађања наставе ликовне уметности. На овај начин, код ученика се повећава разумевање интеграција различитих знања, која у садејству омогућавају, олакшавају и унапређују живот и развој људског друштва.",
publisher = "Београд : Српско хемијско друштво",
journal = "Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.",
title = "Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена",
number = "32",
pages = "29-29",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5913"
}

Савић, С. Д., Стојановић, К. А.,& Радовић, Н. Р.. (2023). Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена. in Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.
Београд : Српско хемијско друштво.(32), 29-29.
https://hdl.handle.net/21.15107/rcub_cherry_5913

Савић СД, Стојановић КА, Радовић НР. Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена. in Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023.. 2023;(32):29-29.
https://hdl.handle.net/21.15107/rcub_cherry_5913 .

Савић, Слађана Д., Стојановић, Ксенија А., Радовић, Небојша Р., "Хемија и ликовна уметност - синтеза пигмента берлинског плавог и његова примена" in Априлски дани о настави хемије 32. Стручно усавршавање за наставнике хемије и 4. Конференција методике наставе хемије, Универзитету Београду ‐ Хемијски факултет, Београд, 24. и 25. април, 2023., no. 32 (2023):29-29,
https://hdl.handle.net/21.15107/rcub_cherry_5913 .

TY  - CONF
AU  - Kojić, Ivan
AU  - Dojčinović, Biljana P.
AU  - Stojanović, Ksenija A.
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5879
AB  - In this study the solid residue obtained by the co-pyrolysis of low quality, mineral-rich lignite taken from the Kostolac Basin, Serbia (45.36% of ash; 33.42% of total organic carbon; net calorific value of 9.5 MJ/kg) and high density polyethylene, HDPE (mass ratio, 1:1) at 500 oC was tested as a sorbent for Cu2+ ions, considering that as a coaly-based material, simultaneously enriched in clays, it may have good adsorption properties. Sorption experiments of were performed using 0.5 g of solid co-pyrolysis lignite/HDPE product, as sorbent which was treated with 5 cm3 of model solutions containing ~ 200 times higher concentration of Cu2+ ions (242.60 mg/dm3), in relationship to its maximal allowed content in surface water of bad quality. Model solutions were prepared using corresponding nitrates dissolved in distilled water. Two model solutions were prepared. The first model solution contained individual Cu2+ ions, whereas the second one contained mixture of Cu2+, Pb2+, Co2+ and Cd2+ ions. Concentration of each ion in latter was also ~ 200 times higher than its maximal allowed content in surface water of bad quality. Treatment with distilled water was used as a blank. Concentrations of heavy metal ions in initial model solutions and supernatants obtained after sorption experiments were measured using inductively coupled plasma – optical emission spectrometry. The obtained results indicated very efficient sorption of Cu2+ ions from its individual model solution, attaining 99.96%. The efficiency of Cu2+ ions sorption was also high (99.95%) from model solution, which contained mixture of metal ions. It is important to mention that sorption of other metal ions from model solution mixture was also effective (99.99%, 80.70% and 71.04% for Pb2, Cd2+ and Co2+, respectively). The preliminary results showed promising sorption properties of solid residue obtained by the co-pyrolysis of lignite and HDPE against Cu2+, but also possibly for other heavy metals, particularly, Pb2+ ions.
PB  - Berichte der Geologischen Bundesanstalt, 143, Vienna, Austria
C3  - PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022
T1  - Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture
SP  - 90
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5879
ER  - 

@conference{
author = "Kojić, Ivan and Dojčinović, Biljana P. and Stojanović, Ksenija A.",
year = "2022",
abstract = "In this study the solid residue obtained by the co-pyrolysis of low quality, mineral-rich lignite taken from the Kostolac Basin, Serbia (45.36% of ash; 33.42% of total organic carbon; net calorific value of 9.5 MJ/kg) and high density polyethylene, HDPE (mass ratio, 1:1) at 500 oC was tested as a sorbent for Cu2+ ions, considering that as a coaly-based material, simultaneously enriched in clays, it may have good adsorption properties. Sorption experiments of were performed using 0.5 g of solid co-pyrolysis lignite/HDPE product, as sorbent which was treated with 5 cm3 of model solutions containing ~ 200 times higher concentration of Cu2+ ions (242.60 mg/dm3), in relationship to its maximal allowed content in surface water of bad quality. Model solutions were prepared using corresponding nitrates dissolved in distilled water. Two model solutions were prepared. The first model solution contained individual Cu2+ ions, whereas the second one contained mixture of Cu2+, Pb2+, Co2+ and Cd2+ ions. Concentration of each ion in latter was also ~ 200 times higher than its maximal allowed content in surface water of bad quality. Treatment with distilled water was used as a blank. Concentrations of heavy metal ions in initial model solutions and supernatants obtained after sorption experiments were measured using inductively coupled plasma – optical emission spectrometry. The obtained results indicated very efficient sorption of Cu2+ ions from its individual model solution, attaining 99.96%. The efficiency of Cu2+ ions sorption was also high (99.95%) from model solution, which contained mixture of metal ions. It is important to mention that sorption of other metal ions from model solution mixture was also effective (99.99%, 80.70% and 71.04% for Pb2, Cd2+ and Co2+, respectively). The preliminary results showed promising sorption properties of solid residue obtained by the co-pyrolysis of lignite and HDPE against Cu2+, but also possibly for other heavy metals, particularly, Pb2+ ions.",
publisher = "Berichte der Geologischen Bundesanstalt, 143, Vienna, Austria",
journal = "PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022",
title = "Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture",
pages = "90",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5879"
}

Kojić, I., Dojčinović, B. P.,& Stojanović, K. A.. (2022). Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture. in PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022
Berichte der Geologischen Bundesanstalt, 143, Vienna, Austria., 90.
https://hdl.handle.net/21.15107/rcub_cherry_5879

Kojić I, Dojčinović BP, Stojanović KA. Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture. in PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022. 2022;:90.
https://hdl.handle.net/21.15107/rcub_cherry_5879 .

Kojić, Ivan, Dojčinović, Biljana P., Stojanović, Ksenija A., "Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture" in PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022 (2022):90,
https://hdl.handle.net/21.15107/rcub_cherry_5879 .

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  - 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/123456789/4847
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  - CONF
AU  - Radović, Nebojša R.
AU  - Stojanović, Ksenija A.
AU  - Savić, Slađana D.
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5790
AB  - Iodine monochloride is an interhalogen compound that acts as an iodinating reagent for aromatic compounds, a halogenating agent for unsaturated compounds and for cleavage of carbon-metal bonds. The direct synthesis of solid iodine monochloride from elements is a very hazardous procedure in the laboratory due to the high toxicity of chlorine and iodine. 
In this paper, a safer method for obtaining a solution of iodine monochloride in glacial acetic acid, which is used as a reagent for determination of the iodine value of fats and oils, is presented. Laboratory preparation of iodine monochloride solution in glacial acetic acid is described in AOAC Official Method 993.20 - Iodine Value of Fats and Oils: chlorine gas passes through the iodine solution in acetic acid until a change in the colour of the solution is observed. If excess of chlorine is present in the resultant solution, it must be neutralised by adding of iodine solution in acetic acid. The main disadvantage of this method is the barely noticeable change in colour from brown to reddish brown and the lack of a procedure for the safe removal of chlorine excess after preparing the reagent. Considering the fact that chlorine gas is soluble in glacial acetic acid, we have overcome the mentioned deficiencies of AOAC Official Method 993.20 by introducing chlorine gas into the glacial acetic acid at 298K. The figure shows the process to obtain a chlorine solution in glacial acetic acid. The necessary volume of concentrated hydrochloric acid is added to the solid potassium permanganate in the reactor vessel (A) and the container is immediately closed. Chlorine gas is released, which flows through concentrated sulphuric acid (B) to remove moisture. After that, the chlorine is introduced into a vessel filled with glacial acetic acid (C). The excess chlorine is then dissolved in a 10% (w/v) sodium hydroxide solution (D) to produce a mixture of sodium hypochlorite and sodium hydroxide, which requires dilution with an appropriate volume of water to obtain an alkaline hypochlorite solution, which has strong disinfectant properties. 
The chlorine content in the glacial acetic acid solution is determined by iodometric titration; the same technique is used for determining the hypochlorite content after absorbing the excess chlorine in the sodium hydroxide solution. The final solution of iodine monochloride is prepared simply by adding a calculated volume of chlorine solution in glacial acetic acid to a specified volume of iodine in the same solvent. The results of our study demonstrate that the reaction of 0.12 mol potassium permanganate with 80 cm3 concentrated hydrochloric acid produce 200 cm3 of 0.85 mol/dm3 chlorine solution in glacial acetic acid and 250 cm3 of 0.34 mol/dm3 alkali sodium hypochlorite solution. This amount of chlorine solution in glacial acetic acid is sufficient to prepare approximately 3 dm3 of 0.1 mol/ dm3 iodine monochloride solution in the same solvent.
PB  - University of Ljubljana Press
C3  - 22nd European Meeting on Environmental Chemistry, Book of Abstracts, 5 – 8 December 2022, Ljubljana, Slovenia
T1  - Synthesis of Iodine monochloride Using a Chlorine Solution in Glacial acetic acid with Simultaneous Disinfectant Generation
IS  - 22
SP  - 103
EP  - 103
DO  - 10.55295/9789612970352
ER  - 

@conference{
author = "Radović, Nebojša R. and Stojanović, Ksenija A. and Savić, Slađana D.",
year = "2022",
abstract = "Iodine monochloride is an interhalogen compound that acts as an iodinating reagent for aromatic compounds, a halogenating agent for unsaturated compounds and for cleavage of carbon-metal bonds. The direct synthesis of solid iodine monochloride from elements is a very hazardous procedure in the laboratory due to the high toxicity of chlorine and iodine. 
In this paper, a safer method for obtaining a solution of iodine monochloride in glacial acetic acid, which is used as a reagent for determination of the iodine value of fats and oils, is presented. Laboratory preparation of iodine monochloride solution in glacial acetic acid is described in AOAC Official Method 993.20 - Iodine Value of Fats and Oils: chlorine gas passes through the iodine solution in acetic acid until a change in the colour of the solution is observed. If excess of chlorine is present in the resultant solution, it must be neutralised by adding of iodine solution in acetic acid. The main disadvantage of this method is the barely noticeable change in colour from brown to reddish brown and the lack of a procedure for the safe removal of chlorine excess after preparing the reagent. Considering the fact that chlorine gas is soluble in glacial acetic acid, we have overcome the mentioned deficiencies of AOAC Official Method 993.20 by introducing chlorine gas into the glacial acetic acid at 298K. The figure shows the process to obtain a chlorine solution in glacial acetic acid. The necessary volume of concentrated hydrochloric acid is added to the solid potassium permanganate in the reactor vessel (A) and the container is immediately closed. Chlorine gas is released, which flows through concentrated sulphuric acid (B) to remove moisture. After that, the chlorine is introduced into a vessel filled with glacial acetic acid (C). The excess chlorine is then dissolved in a 10% (w/v) sodium hydroxide solution (D) to produce a mixture of sodium hypochlorite and sodium hydroxide, which requires dilution with an appropriate volume of water to obtain an alkaline hypochlorite solution, which has strong disinfectant properties. 
The chlorine content in the glacial acetic acid solution is determined by iodometric titration; the same technique is used for determining the hypochlorite content after absorbing the excess chlorine in the sodium hydroxide solution. The final solution of iodine monochloride is prepared simply by adding a calculated volume of chlorine solution in glacial acetic acid to a specified volume of iodine in the same solvent. The results of our study demonstrate that the reaction of 0.12 mol potassium permanganate with 80 cm3 concentrated hydrochloric acid produce 200 cm3 of 0.85 mol/dm3 chlorine solution in glacial acetic acid and 250 cm3 of 0.34 mol/dm3 alkali sodium hypochlorite solution. This amount of chlorine solution in glacial acetic acid is sufficient to prepare approximately 3 dm3 of 0.1 mol/ dm3 iodine monochloride solution in the same solvent.",
publisher = "University of Ljubljana Press",
journal = "22nd European Meeting on Environmental Chemistry, Book of Abstracts, 5 – 8 December 2022, Ljubljana, Slovenia",
title = "Synthesis of Iodine monochloride Using a Chlorine Solution in Glacial acetic acid with Simultaneous Disinfectant Generation",
number = "22",
pages = "103-103",
doi = "10.55295/9789612970352"
}

Radović, N. R., Stojanović, K. A.,& Savić, S. D.. (2022). Synthesis of Iodine monochloride Using a Chlorine Solution in Glacial acetic acid with Simultaneous Disinfectant Generation. in 22nd European Meeting on Environmental Chemistry, Book of Abstracts, 5 – 8 December 2022, Ljubljana, Slovenia
University of Ljubljana Press.(22), 103-103.
https://doi.org/10.55295/9789612970352

Radović NR, Stojanović KA, Savić SD. Synthesis of Iodine monochloride Using a Chlorine Solution in Glacial acetic acid with Simultaneous Disinfectant Generation. in 22nd European Meeting on Environmental Chemistry, Book of Abstracts, 5 – 8 December 2022, Ljubljana, Slovenia. 2022;(22):103-103.
doi:10.55295/9789612970352 .

Radović, Nebojša R., Stojanović, Ksenija A., Savić, Slađana D., "Synthesis of Iodine monochloride Using a Chlorine Solution in Glacial acetic acid with Simultaneous Disinfectant Generation" in 22nd European Meeting on Environmental Chemistry, Book of Abstracts, 5 – 8 December 2022, Ljubljana, Slovenia, no. 22 (2022):103-103,
https://doi.org/10.55295/9789612970352 . .

TY  - CONF
AU  - Stojanović, Ksenija A.
AU  - Kojić, Ivan
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5878
AB  - In this study low quality, mineral-rich lignite taken from the Kostolac Basin (Serbia), containing 45.36 % of ash, 33.42 % of total organic carbon and having low net calorific value of 9.5 MJ/kg was tested as a sorbent for heavy metals and polycyclic aromatic hydrocarbons (PAHs), considering that due to the low maturity (huminite reflectance, 0.30±0.03 %) it contains numerous oxygenic electron-donor functional groups (carboxylic, phenolic, alcoholic) available to complex metal ions, as well as that petrographic analysis indicated a high amount of clays in mineral matter, which have good adsorption properties. The obtained results indicated very efficient sorption of heavy metals on lignite ranged from 87.34 % for Co2+ ion to more than 99.40 % for Cu2+ and Pb2+ ions (Table 1). The slightly lower percent of adsorption of Cd2+ ion can be attributed to its order of magnitude smaller concentration in model solution, which however corresponds to generally lower concentration of this very toxic element in natural waste waters. Almost quantitative sorption of PAHs having 3 or more aromatic rings was observed. This is very important considering that toxicity and persistency of PAHs rise with increase of number of condensed aromatic rings. Significantly smaller percent of sorption of low-molecular weight PAHs can be partly attributed to their volatility. The obtained results showed that used lignite has good sorption properties against heavy metals, particularly Cu2+ and Pb2+ ions, as well as PAHs containing 3 or more aromatic rings.
PB  - Tomsk : Institute of Atmospheric Optics “V.E. Zuev“ of the Siberian Branch of the Russian Academy of Sciences
C3  - 12th International Conference “Oil and Gas Chemistry”, Tomsk, Russia, September 26-30, 2022
T1  - Novel aspects of utilization of mineral-rich lignite as an efficient sorbent of heavy metals and polycyclic aromatic hydrocarbons
SP  - 19
EP  - 20
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5878
ER  - 

@conference{
author = "Stojanović, Ksenija A. and Kojić, Ivan",
year = "2022",
abstract = "In this study low quality, mineral-rich lignite taken from the Kostolac Basin (Serbia), containing 45.36 % of ash, 33.42 % of total organic carbon and having low net calorific value of 9.5 MJ/kg was tested as a sorbent for heavy metals and polycyclic aromatic hydrocarbons (PAHs), considering that due to the low maturity (huminite reflectance, 0.30±0.03 %) it contains numerous oxygenic electron-donor functional groups (carboxylic, phenolic, alcoholic) available to complex metal ions, as well as that petrographic analysis indicated a high amount of clays in mineral matter, which have good adsorption properties. The obtained results indicated very efficient sorption of heavy metals on lignite ranged from 87.34 % for Co2+ ion to more than 99.40 % for Cu2+ and Pb2+ ions (Table 1). The slightly lower percent of adsorption of Cd2+ ion can be attributed to its order of magnitude smaller concentration in model solution, which however corresponds to generally lower concentration of this very toxic element in natural waste waters. Almost quantitative sorption of PAHs having 3 or more aromatic rings was observed. This is very important considering that toxicity and persistency of PAHs rise with increase of number of condensed aromatic rings. Significantly smaller percent of sorption of low-molecular weight PAHs can be partly attributed to their volatility. The obtained results showed that used lignite has good sorption properties against heavy metals, particularly Cu2+ and Pb2+ ions, as well as PAHs containing 3 or more aromatic rings.",
publisher = "Tomsk : Institute of Atmospheric Optics “V.E. Zuev“ of the Siberian Branch of the Russian Academy of Sciences",
journal = "12th International Conference “Oil and Gas Chemistry”, Tomsk, Russia, September 26-30, 2022",
title = "Novel aspects of utilization of mineral-rich lignite as an efficient sorbent of heavy metals and polycyclic aromatic hydrocarbons",
pages = "19-20",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5878"
}

Stojanović, K. A.,& Kojić, I.. (2022). Novel aspects of utilization of mineral-rich lignite as an efficient sorbent of heavy metals and polycyclic aromatic hydrocarbons. in 12th International Conference “Oil and Gas Chemistry”, Tomsk, Russia, September 26-30, 2022
Tomsk : Institute of Atmospheric Optics “V.E. Zuev“ of the Siberian Branch of the Russian Academy of Sciences., 19-20.
https://hdl.handle.net/21.15107/rcub_cherry_5878

Stojanović KA, Kojić I. Novel aspects of utilization of mineral-rich lignite as an efficient sorbent of heavy metals and polycyclic aromatic hydrocarbons. in 12th International Conference “Oil and Gas Chemistry”, Tomsk, Russia, September 26-30, 2022. 2022;:19-20.
https://hdl.handle.net/21.15107/rcub_cherry_5878 .

Stojanović, Ksenija A., Kojić, Ivan, "Novel aspects of utilization of mineral-rich lignite as an efficient sorbent of heavy metals and polycyclic aromatic hydrocarbons" in 12th International Conference “Oil and Gas Chemistry”, Tomsk, Russia, September 26-30, 2022 (2022):19-20,
https://hdl.handle.net/21.15107/rcub_cherry_5878 .

TY  - JOUR
AU  - Stevanović, Jelena Z.
AU  - Rakitin, Anton R.
AU  - Kojić, Ivan 
AU  - Vuković, Nikola S.
AU  - Stojanović, Ksenija A.
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4854
AB  - A detailed investigation of significance of the infrared (IR) spectro­scopic branching factor (СН2/СН3; the ratio of methylene and methyl group peak heights at 2917–2921 and 2951–2954 cm-1, respectively in the IR spectra) for charac­te­ri­za­tion of alkane structure, geochemical properties and viscosity of 76 oil samples was performed. These oils, originating from 13 Serbian oil fields in SE Pannonian Basin, differ according to source and depositional envi­ronment of organic matter (OM), as well as by thermal maturity and biodeg­rad­ation stage. Methylene and methyl asymmetric stretching peak absorbances were used for the branching factor calculation. CH2 peak positions exhibited3–4 cm-1 red shift with increasing the CH2/CH3 ratio, due to a greater contri­bution of trans vs. gauche rotamers in ali­pha­tic chains. Comparing IR spectra of the oils and model n-alkanes, it was established that the average (CH2)n methylene chain length per СН3 group varied from n = 3.5 to 6.5. The CH2/CH3 ratio showed significant concordance with geochemical para­meters, enabling clear distinction of the oils according to source and deposi­ti­onal environment of OM. At the same time, dependence of the CH2/CH3 ratio on oil maturity in the range from immature to mature was not observed, allowing for an accurate determination of oil genetic types irrespective of maturity. The CH2/CH3 ratio showed good accordance with oil biodegradation scale and oil viscosity.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils: Scientific paper
VL  - 87
IS  - 1
SP  - 41
EP  - 55
DO  - 10.2298/JSC210830091S
ER  - 

@article{
author = "Stevanović, Jelena Z. and Rakitin, Anton R. and Kojić, Ivan  and Vuković, Nikola S. and Stojanović, Ksenija A.",
year = "2022",
abstract = "A detailed investigation of significance of the infrared (IR) spectro­scopic branching factor (СН2/СН3; the ratio of methylene and methyl group peak heights at 2917–2921 and 2951–2954 cm-1, respectively in the IR spectra) for charac­te­ri­za­tion of alkane structure, geochemical properties and viscosity of 76 oil samples was performed. These oils, originating from 13 Serbian oil fields in SE Pannonian Basin, differ according to source and depositional envi­ronment of organic matter (OM), as well as by thermal maturity and biodeg­rad­ation stage. Methylene and methyl asymmetric stretching peak absorbances were used for the branching factor calculation. CH2 peak positions exhibited3–4 cm-1 red shift with increasing the CH2/CH3 ratio, due to a greater contri­bution of trans vs. gauche rotamers in ali­pha­tic chains. Comparing IR spectra of the oils and model n-alkanes, it was established that the average (CH2)n methylene chain length per СН3 group varied from n = 3.5 to 6.5. The CH2/CH3 ratio showed significant concordance with geochemical para­meters, enabling clear distinction of the oils according to source and deposi­ti­onal environment of OM. At the same time, dependence of the CH2/CH3 ratio on oil maturity in the range from immature to mature was not observed, allowing for an accurate determination of oil genetic types irrespective of maturity. The CH2/CH3 ratio showed good accordance with oil biodegradation scale and oil viscosity.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils: Scientific paper",
volume = "87",
number = "1",
pages = "41-55",
doi = "10.2298/JSC210830091S"
}

Stevanović, J. Z., Rakitin, A. R., Kojić, I., Vuković, N. S.,& Stojanović, K. A.. (2022). Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils: Scientific paper. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 87(1), 41-55.
https://doi.org/10.2298/JSC210830091S

Stevanović JZ, Rakitin AR, Kojić I, Vuković NS, Stojanović KA. Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils: Scientific paper. in Journal of the Serbian Chemical Society. 2022;87(1):41-55.
doi:10.2298/JSC210830091S .

Stevanović, Jelena Z., Rakitin, Anton R., Kojić, Ivan , Vuković, Nikola S., Stojanović, Ksenija A., "Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils: Scientific paper" in Journal of the Serbian Chemical Society, 87, no. 1 (2022):41-55,
https://doi.org/10.2298/JSC210830091S . .

TY  - DATA
AU  - Stevanović, Jelena Z.
AU  - Rakitin, Anton R.
AU  - Kojić, Ivan 
AU  - Vuković, Nikola S.
AU  - Stojanović, Ksenija A.
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4855
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Supplementary data for the article: Stevanović, J. Z.; Rakitin, A. R.; Kojić, I. D.; Vuković, N. S.; Stojanović, K. Significance of Infrared Spectroscopic Branching Factor for Investigation of Structural Characteristics of Alkanes, Geochemical Properties and Viscosity of Oils: Scientific Paper. Journal of the Serbian Chemical Society 2022, 87 (1), 41–55. https://doi.org/10.2298/JSC210830091S.
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4855
ER  - 

@misc{
author = "Stevanović, Jelena Z. and Rakitin, Anton R. and Kojić, Ivan  and Vuković, Nikola S. and Stojanović, Ksenija A.",
year = "2022",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Supplementary data for the article: Stevanović, J. Z.; Rakitin, A. R.; Kojić, I. D.; Vuković, N. S.; Stojanović, K. Significance of Infrared Spectroscopic Branching Factor for Investigation of Structural Characteristics of Alkanes, Geochemical Properties and Viscosity of Oils: Scientific Paper. Journal of the Serbian Chemical Society 2022, 87 (1), 41–55. https://doi.org/10.2298/JSC210830091S.",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4855"
}

Stevanović, J. Z., Rakitin, A. R., Kojić, I., Vuković, N. S.,& Stojanović, K. A.. (2022). Supplementary data for the article: Stevanović, J. Z.; Rakitin, A. R.; Kojić, I. D.; Vuković, N. S.; Stojanović, K. Significance of Infrared Spectroscopic Branching Factor for Investigation of Structural Characteristics of Alkanes, Geochemical Properties and Viscosity of Oils: Scientific Paper. Journal of the Serbian Chemical Society 2022, 87 (1), 41–55. https://doi.org/10.2298/JSC210830091S.. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society..
https://hdl.handle.net/21.15107/rcub_cherry_4855

Stevanović JZ, Rakitin AR, Kojić I, Vuković NS, Stojanović KA. Supplementary data for the article: Stevanović, J. Z.; Rakitin, A. R.; Kojić, I. D.; Vuković, N. S.; Stojanović, K. Significance of Infrared Spectroscopic Branching Factor for Investigation of Structural Characteristics of Alkanes, Geochemical Properties and Viscosity of Oils: Scientific Paper. Journal of the Serbian Chemical Society 2022, 87 (1), 41–55. https://doi.org/10.2298/JSC210830091S.. in Journal of the Serbian Chemical Society. 2022;.
https://hdl.handle.net/21.15107/rcub_cherry_4855 .

Stevanović, Jelena Z., Rakitin, Anton R., Kojić, Ivan , Vuković, Nikola S., Stojanović, Ksenija A., "Supplementary data for the article: Stevanović, J. Z.; Rakitin, A. R.; Kojić, I. D.; Vuković, N. S.; Stojanović, K. Significance of Infrared Spectroscopic Branching Factor for Investigation of Structural Characteristics of Alkanes, Geochemical Properties and Viscosity of Oils: Scientific Paper. Journal of the Serbian Chemical Society 2022, 87 (1), 41–55. https://doi.org/10.2298/JSC210830091S." in Journal of the Serbian Chemical Society (2022),
https://hdl.handle.net/21.15107/rcub_cherry_4855 .

TY  - CONF
AU  - Gajica, G.
AU  - Šajnović, Aleksandra
AU  - Schwarzbauer, J.
AU  - Kostić, A.
AU  - Jovančićević, Branimir
AU  - Stojanović, Ksenija A.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5190
AB  - The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined.

The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently on kerogen type. The LPs from the CS pyrolysis have the distributions of biomarkers similar to those in crude oils generated in an early to main stage of “oil window“. The biomarker data suggests that mixed type I/II kerogen attained slightly higher maturity level by the CS pyrolysis than type I kerogen. The isotopic signatures of n-alkanes in LPs obtained by the OS pyrolysis are isotopically lighter than in initial bitumen, independently on kerogen type, whereas in liquid products from the CS they become heavier; showing more pronounced difference for type I kerogen. The results indicate that δ13C data should be used with caution in interpretation of samples having different maturity and particularly of LPs obtained by different system pyrolysis.
PB  - European Association of Geoscientists & Engineers
C3  - Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
T1  - Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system).
VL  - 2021
DO  - 10.3997/2214-4609.202134040
ER  - 

@conference{
author = "Gajica, G. and Šajnović, Aleksandra and Schwarzbauer, J. and Kostić, A. and Jovančićević, Branimir and Stojanović, Ksenija A.",
year = "2021",
abstract = "The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined.

The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently on kerogen type. The LPs from the CS pyrolysis have the distributions of biomarkers similar to those in crude oils generated in an early to main stage of “oil window“. The biomarker data suggests that mixed type I/II kerogen attained slightly higher maturity level by the CS pyrolysis than type I kerogen. The isotopic signatures of n-alkanes in LPs obtained by the OS pyrolysis are isotopically lighter than in initial bitumen, independently on kerogen type, whereas in liquid products from the CS they become heavier; showing more pronounced difference for type I kerogen. The results indicate that δ13C data should be used with caution in interpretation of samples having different maturity and particularly of LPs obtained by different system pyrolysis.",
publisher = "European Association of Geoscientists & Engineers",
journal = "Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)",
title = "Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system).",
volume = "2021",
doi = "10.3997/2214-4609.202134040"
}

Gajica, G., Šajnović, A., Schwarzbauer, J., Kostić, A., Jovančićević, B.,& Stojanović, K. A.. (2021). Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system).. in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
European Association of Geoscientists & Engineers., 2021.
https://doi.org/10.3997/2214-4609.202134040

Gajica G, Šajnović A, Schwarzbauer J, Kostić A, Jovančićević B, Stojanović KA. Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system).. in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021). 2021;2021.
doi:10.3997/2214-4609.202134040 .

Gajica, G., Šajnović, Aleksandra, Schwarzbauer, J., Kostić, A., Jovančićević, Branimir, Stojanović, Ksenija A., "Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system)." in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021), 2021 (2021),
https://doi.org/10.3997/2214-4609.202134040 . .

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  - CONF
AU  - Radović, Nebojša R.
AU  - Stojanović, Ksenija A.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4933
AB  - The iodine value (iodine number) is characteristic for the content of unsaturated fatty acids in fats, fixed oils, emulsifiers and solubilizers. The determination of the iodine value is of significance for pharmaceutics, food chemistry and cosmetics. Standard methods for the iodine value determination approved by the Association of Official Analytical Collaboration (AOAC) International, the American Oil Chemists’ Society (AOCS), the International Organization for Standardization (ISO) and the European Pharmacopoeia (Eur. Ph.) [1-3] use hazardous solvents for fat samples such as cyclohexane/ glacial acetic acid mixture or chloroform, whereas glacial acetic acid is unique solvent for iodine monochloride or iodine monobromide that serves as iodination agent. Certain earlier proposals for more environmental friendly and faster iodine value determination considered utilization of 1,3-dibromo-5,5-dimethylhydantoin and potassium iodide instead of iodine monobromide, however also in glacial acetic acid as a solvent [4,5]. Recently, combining data from American and ISO standards, the Metrohm (2019) [6] proposed utilization of glacial acetic acid as a solvent for the fat sample and addition of magnesium acetate as catalyst to significantly reduce the reaction time, from 1 h to 5 minutes. In the current study we report certain novelties, which may contribute to development of less hazardous and environmental friendly method for the iodine value determination. Our method considers utilization of ethyl acetate as a solvent for the sample instead of cyclohexane/glacial acetic acid mixture or chloroform, whereas iodine monochloride in glacial acetic acid has been replaced by water solution of iodine monochloride (stabilized by small amount of hydrochloric acid). In the presence of ethyl acetate, starch solution does not yield the characteristic blue colour with iodine. Nevertheless, the titration end point can be recognized clearly and precisely without indicator. The method was tested on the following samples: coconut oil, olive oil, sunflower oil and linseed oil, covering a wide range of the iodine value from ~8 to ~180. Comparison of the average iodine values for studied samples obtained by the proposed and standard AOAC method indicates standard deviation less than 0.60, whereas repeatability limit for the proposed method is bellow 1.7 that is in line with statistical results for the precision of the Wijs method reported in ISO 3961 (2018) standard [2].
PB  - Belgrade : Serbian Chemical Society
C3  - Book of Abstracts 21st; European Meeting on Environmental Chemistry
T1  - Determination of the Iodine Value – Novel Environmental Friendly Insights
SP  - 174
EP  - 174
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4933
ER  - 

@conference{
author = "Radović, Nebojša R. and Stojanović, Ksenija A.",
year = "2021",
abstract = "The iodine value (iodine number) is characteristic for the content of unsaturated fatty acids in fats, fixed oils, emulsifiers and solubilizers. The determination of the iodine value is of significance for pharmaceutics, food chemistry and cosmetics. Standard methods for the iodine value determination approved by the Association of Official Analytical Collaboration (AOAC) International, the American Oil Chemists’ Society (AOCS), the International Organization for Standardization (ISO) and the European Pharmacopoeia (Eur. Ph.) [1-3] use hazardous solvents for fat samples such as cyclohexane/ glacial acetic acid mixture or chloroform, whereas glacial acetic acid is unique solvent for iodine monochloride or iodine monobromide that serves as iodination agent. Certain earlier proposals for more environmental friendly and faster iodine value determination considered utilization of 1,3-dibromo-5,5-dimethylhydantoin and potassium iodide instead of iodine monobromide, however also in glacial acetic acid as a solvent [4,5]. Recently, combining data from American and ISO standards, the Metrohm (2019) [6] proposed utilization of glacial acetic acid as a solvent for the fat sample and addition of magnesium acetate as catalyst to significantly reduce the reaction time, from 1 h to 5 minutes. In the current study we report certain novelties, which may contribute to development of less hazardous and environmental friendly method for the iodine value determination. Our method considers utilization of ethyl acetate as a solvent for the sample instead of cyclohexane/glacial acetic acid mixture or chloroform, whereas iodine monochloride in glacial acetic acid has been replaced by water solution of iodine monochloride (stabilized by small amount of hydrochloric acid). In the presence of ethyl acetate, starch solution does not yield the characteristic blue colour with iodine. Nevertheless, the titration end point can be recognized clearly and precisely without indicator. The method was tested on the following samples: coconut oil, olive oil, sunflower oil and linseed oil, covering a wide range of the iodine value from ~8 to ~180. Comparison of the average iodine values for studied samples obtained by the proposed and standard AOAC method indicates standard deviation less than 0.60, whereas repeatability limit for the proposed method is bellow 1.7 that is in line with statistical results for the precision of the Wijs method reported in ISO 3961 (2018) standard [2].",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Book of Abstracts 21st; European Meeting on Environmental Chemistry",
title = "Determination of the Iodine Value – Novel Environmental Friendly Insights",
pages = "174-174",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4933"
}

Radović, N. R.,& Stojanović, K. A.. (2021). Determination of the Iodine Value – Novel Environmental Friendly Insights. in Book of Abstracts 21st; European Meeting on Environmental Chemistry
Belgrade : Serbian Chemical Society., 174-174.
https://hdl.handle.net/21.15107/rcub_cherry_4933

Radović NR, Stojanović KA. Determination of the Iodine Value – Novel Environmental Friendly Insights. in Book of Abstracts 21st; European Meeting on Environmental Chemistry. 2021;:174-174.
https://hdl.handle.net/21.15107/rcub_cherry_4933 .

Radović, Nebojša R., Stojanović, Ksenija A., "Determination of the Iodine Value – Novel Environmental Friendly Insights" in Book of Abstracts 21st; European Meeting on Environmental Chemistry (2021):174-174,
https://hdl.handle.net/21.15107/rcub_cherry_4933 .

TY  - CONF
AU  - Stevanović, J.
AU  - Rakitin, A.R.
AU  - Stojanović, Ksenija A.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5170
AB  - The work focuses on the applicability of infrared (IR) aliphatic stretching region for characterisation of oils of the same genetic type. Paraffinic oils (56 samples) from the Turija-Sever oil field were studied. The oils are similar originate from mixed aquatic/terrestrial sources and were generated from Tertiary source rocks in an early stage of oil window. However, slight differences among the oils were observed. They are reflected in a higher contribution of algal organic matter (OM) to the group I oils formed in more reducing environment (western part of the field), compared to the oils from eastern part (group II). The IR CH2/CH3 branching factor segregates oils into two identical groups (I and II) established based on biomarkers and aromatic hydrocarbons. The group I oils showed lower values of CH2/CH3 factor than group II oils. Enhanced CH2/CH3 ratio for group II oils indicate that in the case of uniform maturity greater average length of polymethylene fragments results from a higher content of long chain n-alkanes signifying an increased impact of terrigenous OM (land plant waxes). Correlation between the normal to isoprenoid alkanes sum ratio and the CH2/CH3 factor is useful for detecting slight differences between oils of the same genetic type.
PB  - European Association of Geoscientists & Engineers
C3  - Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
T1  - Applicability of infrared aliphatic stretching region for characterisation of oils of the same genetic type
VL  - 2021
DO  - 10.3997/2214-4609.202134140
ER  - 

@conference{
author = "Stevanović, J. and Rakitin, A.R. and Stojanović, Ksenija A.",
year = "2021",
abstract = "The work focuses on the applicability of infrared (IR) aliphatic stretching region for characterisation of oils of the same genetic type. Paraffinic oils (56 samples) from the Turija-Sever oil field were studied. The oils are similar originate from mixed aquatic/terrestrial sources and were generated from Tertiary source rocks in an early stage of oil window. However, slight differences among the oils were observed. They are reflected in a higher contribution of algal organic matter (OM) to the group I oils formed in more reducing environment (western part of the field), compared to the oils from eastern part (group II). The IR CH2/CH3 branching factor segregates oils into two identical groups (I and II) established based on biomarkers and aromatic hydrocarbons. The group I oils showed lower values of CH2/CH3 factor than group II oils. Enhanced CH2/CH3 ratio for group II oils indicate that in the case of uniform maturity greater average length of polymethylene fragments results from a higher content of long chain n-alkanes signifying an increased impact of terrigenous OM (land plant waxes). Correlation between the normal to isoprenoid alkanes sum ratio and the CH2/CH3 factor is useful for detecting slight differences between oils of the same genetic type.",
publisher = "European Association of Geoscientists & Engineers",
journal = "Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)",
title = "Applicability of infrared aliphatic stretching region for characterisation of oils of the same genetic type",
volume = "2021",
doi = "10.3997/2214-4609.202134140"
}

Stevanović, J., Rakitin, A.R.,& Stojanović, K. A.. (2021). Applicability of infrared aliphatic stretching region for characterisation of oils of the same genetic type. in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
European Association of Geoscientists & Engineers., 2021.
https://doi.org/10.3997/2214-4609.202134140

Stevanović J, Rakitin A, Stojanović KA. Applicability of infrared aliphatic stretching region for characterisation of oils of the same genetic type. in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021). 2021;2021.
doi:10.3997/2214-4609.202134140 .

Stevanović, J., Rakitin, A.R., Stojanović, Ksenija A., "Applicability of infrared aliphatic stretching region for characterisation of oils of the same genetic type" in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021), 2021 (2021),
https://doi.org/10.3997/2214-4609.202134140 . .