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  - 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  - Đurović, Saša
AU  - Kojić, Ivan
AU  - Radović, Nebojša R.
AU  - Tosti, Tomislav
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5928
AB  - Usled modernog načina života ljudi provode oko 90 % vremena u zatvorenim prostorijama,
kao što su kuće/stanovi, kancelarije, automobili itd. Prašina je sve prisutna u svim
pomenutim sredinama i nalazi se kao čestice suspendovane u vazduhu ili istaložena na
površinama. Čestice prašine se mogu lako udahnuti i mogu da oštete respiratorni sistem i
pluća. Pored toga, čestice prašine akumuliraju hemikalije iz zatvorenih prostorija i
predstavljaju važan put izlaganja ljudi tim jedinjenjima. U kućnoj prašini se mogu naći
ftalati, policiklični aromatični ugljovodonici i ostala poluisparljiva jedinjenja.
Ftalati se često koriste kao plastifikator u proizvodnji polivinil hlorida (PVC-a) i predmeta
opšte upotrebe kao što su građevinski materijal, dečije igračke i nameštaj, ali i u proizvodnji
podnih obloga, veštačke kože, lepkova, tepiha, maziva, cevi, žica, sredstava za čišćenje
kuće, proizvoda za negu tela (fiksatori mirisa, proizvodi za negu kože, pene i šamponi) i
ambalaže za namirnice. Primena ftalata zavisi od njihove molekulske mase. Ftalati male
molekulske mase, kao što su di-metil-ftalat (DMP), di-etil-ftalat (DEP), di-propil-ftalat
(DPP), di-izobutil-ftalat (DiBP), di-n-butil ftalat (DBP), di-n-pentil-ftalat (DNPP) i benzil-
butil-ftalat (BBP), se koriste u rastvaračima, lepkovima, voskovima, mastilu, lekovima,
kozmetici i insekticidima.Visokomolekulski ftalati, kao di-2-etilheksil-ftalat (DEHP), di-
ciklo-heksil-ftalat (DCHP) i di-izo-nonil-ftalat (DiNP), su plastifikatori u PVC proizvodima
i predmetima od opšte upotrebe.
Estri ftalata su povezani sa velikim brojem zdravstvenih problema kod ljudi. Pre svega,
ftalati deluju kao endokrini disruptori i doprinose stvaranju varijacija u reprodukcionom
sistemu kao što su opadanje broja spermatozoida, oštećenje DNK u spermatozoidima,
prevremeni razvoj dojki i promena u reproduktivnim hormonima. Ftalati utiču na pojavu
astme, alergija i poremećaja funkcije nervnog sistema. Pored toga, DEHP je okarakterisan
kao 2b kancerogena supstanca, tj. kao potencijalno kancerogen za ljude, od strane IARC-a
(Međunarodna agencija za istraživanje raka, eng. International Agency for Research on
Cancer). Treba napomenuti da su pojedini metaboliti ftalata često toksičniji od samih
nepromenjenih ftalata. Ljudi mogu biti izloženi ftalatima inhalacijom, ingestijom i
apsorpcijom preko kože.
Oko 1 g istaložene prašine je sakupljen iz biblioteke Hemijskog fakulteta u Beogradu, sa
visine iznad 1m od poda. Uzorci su odmereni, ekstrahovani, prečišćeni i aromatična frakcija je snimljena metodom gasne hromatografije, povezanom sa masenim spektrometrom.
Lokacija uzorkovanja i hromatogram aromatične frakcije je prikazan na slici 1.
Dobijeni rezultati ukazuju na to da, pored prirodnih proizvoda kao što su metil estri masnih
kiselina (koje su najverovatnije znatno obilnije u alifatičnoj frakciji), uzorak sadrži 3,5-di-
terc-butil-4-hidroksibenzaldehid, metabolit 2,6-di-terc-butil-4-methilfenola, koji se koristi
kao antioksidans u namirnicama i kozmetičkim proizvodima [3]. Najzastupljenija jedinjenja
u aromatičnoj frakciji su DiBP), DBP i DEHP. Interesantno je primetiti da se detektovani
ftalati koriste u dve različite svrhe, kao aditivi u plastici i drugim proizvodima (DiBP i DBP)
i kao plastifikatori u polimerima (DEHP). Kao što je prethodno pomenuto, DEHP je
klasifikovan kao potencijalno kancerogena supstanca za ljude. Pored toga, primena DiBP,
DBP i DEHP je ograničena od strane Evropske komisije. Zbog prisustva ftalata koji
imaju veliki uticaj na ljudsko zdravlje u ekstraktu prašine, potrebno je izvršiti dodatna
ispitivanja na većem broju uzoraka i uraditi detaljnu kvantifikaciju i procenu rizika po
ljudsko zdravlje.
PB  - Belgrade : Serbian Chemical Society
C3  - 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023
T1  - Preliminarno ispitivanje sastava aromatične frakcije ekstrakta prašine iz biblioteke Hemijskog fakulteta u Beogradu
T1  - Preliminary investigation of aromatic fraction composition indust extract from the Library of the Facility of Chemistry in Belgrade
SP  - 117
EP  - 118
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5928
ER  - 

@conference{
author = "Đurović, Saša and Kojić, Ivan and Radović, Nebojša R. and Tosti, Tomislav",
year = "2023",
abstract = "Usled modernog načina života ljudi provode oko 90 % vremena u zatvorenim prostorijama,
kao što su kuće/stanovi, kancelarije, automobili itd. Prašina je sve prisutna u svim
pomenutim sredinama i nalazi se kao čestice suspendovane u vazduhu ili istaložena na
površinama. Čestice prašine se mogu lako udahnuti i mogu da oštete respiratorni sistem i
pluća. Pored toga, čestice prašine akumuliraju hemikalije iz zatvorenih prostorija i
predstavljaju važan put izlaganja ljudi tim jedinjenjima. U kućnoj prašini se mogu naći
ftalati, policiklični aromatični ugljovodonici i ostala poluisparljiva jedinjenja.
Ftalati se često koriste kao plastifikator u proizvodnji polivinil hlorida (PVC-a) i predmeta
opšte upotrebe kao što su građevinski materijal, dečije igračke i nameštaj, ali i u proizvodnji
podnih obloga, veštačke kože, lepkova, tepiha, maziva, cevi, žica, sredstava za čišćenje
kuće, proizvoda za negu tela (fiksatori mirisa, proizvodi za negu kože, pene i šamponi) i
ambalaže za namirnice. Primena ftalata zavisi od njihove molekulske mase. Ftalati male
molekulske mase, kao što su di-metil-ftalat (DMP), di-etil-ftalat (DEP), di-propil-ftalat
(DPP), di-izobutil-ftalat (DiBP), di-n-butil ftalat (DBP), di-n-pentil-ftalat (DNPP) i benzil-
butil-ftalat (BBP), se koriste u rastvaračima, lepkovima, voskovima, mastilu, lekovima,
kozmetici i insekticidima.Visokomolekulski ftalati, kao di-2-etilheksil-ftalat (DEHP), di-
ciklo-heksil-ftalat (DCHP) i di-izo-nonil-ftalat (DiNP), su plastifikatori u PVC proizvodima
i predmetima od opšte upotrebe.
Estri ftalata su povezani sa velikim brojem zdravstvenih problema kod ljudi. Pre svega,
ftalati deluju kao endokrini disruptori i doprinose stvaranju varijacija u reprodukcionom
sistemu kao što su opadanje broja spermatozoida, oštećenje DNK u spermatozoidima,
prevremeni razvoj dojki i promena u reproduktivnim hormonima. Ftalati utiču na pojavu
astme, alergija i poremećaja funkcije nervnog sistema. Pored toga, DEHP je okarakterisan
kao 2b kancerogena supstanca, tj. kao potencijalno kancerogen za ljude, od strane IARC-a
(Međunarodna agencija za istraživanje raka, eng. International Agency for Research on
Cancer). Treba napomenuti da su pojedini metaboliti ftalata često toksičniji od samih
nepromenjenih ftalata. Ljudi mogu biti izloženi ftalatima inhalacijom, ingestijom i
apsorpcijom preko kože.
Oko 1 g istaložene prašine je sakupljen iz biblioteke Hemijskog fakulteta u Beogradu, sa
visine iznad 1m od poda. Uzorci su odmereni, ekstrahovani, prečišćeni i aromatična frakcija je snimljena metodom gasne hromatografije, povezanom sa masenim spektrometrom.
Lokacija uzorkovanja i hromatogram aromatične frakcije je prikazan na slici 1.
Dobijeni rezultati ukazuju na to da, pored prirodnih proizvoda kao što su metil estri masnih
kiselina (koje su najverovatnije znatno obilnije u alifatičnoj frakciji), uzorak sadrži 3,5-di-
terc-butil-4-hidroksibenzaldehid, metabolit 2,6-di-terc-butil-4-methilfenola, koji se koristi
kao antioksidans u namirnicama i kozmetičkim proizvodima [3]. Najzastupljenija jedinjenja
u aromatičnoj frakciji su DiBP), DBP i DEHP. Interesantno je primetiti da se detektovani
ftalati koriste u dve različite svrhe, kao aditivi u plastici i drugim proizvodima (DiBP i DBP)
i kao plastifikatori u polimerima (DEHP). Kao što je prethodno pomenuto, DEHP je
klasifikovan kao potencijalno kancerogena supstanca za ljude. Pored toga, primena DiBP,
DBP i DEHP je ograničena od strane Evropske komisije. Zbog prisustva ftalata koji
imaju veliki uticaj na ljudsko zdravlje u ekstraktu prašine, potrebno je izvršiti dodatna
ispitivanja na većem broju uzoraka i uraditi detaljnu kvantifikaciju i procenu rizika po
ljudsko zdravlje.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023",
title = "Preliminarno ispitivanje sastava aromatične frakcije ekstrakta prašine iz biblioteke Hemijskog fakulteta u Beogradu, Preliminary investigation of aromatic fraction composition indust extract from the Library of the Facility of Chemistry in Belgrade",
pages = "117-118",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5928"
}

Đurović, S., Kojić, I., Radović, N. R.,& Tosti, T.. (2023). Preliminarno ispitivanje sastava aromatične frakcije ekstrakta prašine iz biblioteke Hemijskog fakulteta u Beogradu. in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023
Belgrade : Serbian Chemical Society., 117-118.
https://hdl.handle.net/21.15107/rcub_cherry_5928

Đurović S, Kojić I, Radović NR, Tosti T. Preliminarno ispitivanje sastava aromatične frakcije ekstrakta prašine iz biblioteke Hemijskog fakulteta u Beogradu. in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023. 2023;:117-118.
https://hdl.handle.net/21.15107/rcub_cherry_5928 .

Đurović, Saša, Kojić, Ivan, Radović, Nebojša R., Tosti, Tomislav, "Preliminarno ispitivanje sastava aromatične frakcije ekstrakta prašine iz biblioteke Hemijskog fakulteta u Beogradu" in 9th Symposium Chemistry and Environmental Protection, EnviroChem2023, Kladovo, 4-7th June 2023 (2023):117-118,
https://hdl.handle.net/21.15107/rcub_cherry_5928 .

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  - 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  - THES
AU  - Kojić, Ivan
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5640
AB  - U doktorskoj disertaciji je urađeno detaljno ispitivanje pirolize uzoraka preekstrahovanihlitotipova lignita, polietilena visoke gustine (eng. High Density Polyethylene, HDPE) i kopirolizenjihove smeše u otvorenom sistemu, kao moguće metode za racinalnu primenu niskokvalietnog lignita uz istovremenu upotrebuplastičnih kesa...
AB  - In the doctoral dissertation, a detailed examination of pyrolysis of bitumen-free lignite lithotypesamples, high density polyethylene (HDPE) and co-pyrolysis of their mixture in an open system wasperformed, to assess the possibility for rational utilization of low quality lignite with the simultaneous usage of plastic bags...
PB  - Универзитет у Београду, Хемијски факултет
T2  - Универзитет у Београду
T1  - Proučavanje sinergetskog efekta kopirolize lignita i polietilena visoke gustine u otvorenom sistemu - petrografski i geohemijski pristup
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5640
ER  - 

@phdthesis{
author = "Kojić, Ivan",
year = "2022",
abstract = "U doktorskoj disertaciji je urađeno detaljno ispitivanje pirolize uzoraka preekstrahovanihlitotipova lignita, polietilena visoke gustine (eng. High Density Polyethylene, HDPE) i kopirolizenjihove smeše u otvorenom sistemu, kao moguće metode za racinalnu primenu niskokvalietnog lignita uz istovremenu upotrebuplastičnih kesa..., In the doctoral dissertation, a detailed examination of pyrolysis of bitumen-free lignite lithotypesamples, high density polyethylene (HDPE) and co-pyrolysis of their mixture in an open system wasperformed, to assess the possibility for rational utilization of low quality lignite with the simultaneous usage of plastic bags...",
publisher = "Универзитет у Београду, Хемијски факултет",
journal = "Универзитет у Београду",
title = "Proučavanje sinergetskog efekta kopirolize lignita i polietilena visoke gustine u otvorenom sistemu - petrografski i geohemijski pristup",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5640"
}

Kojić, I.. (2022). Proučavanje sinergetskog efekta kopirolize lignita i polietilena visoke gustine u otvorenom sistemu - petrografski i geohemijski pristup. in Универзитет у Београду
Универзитет у Београду, Хемијски факултет..
https://hdl.handle.net/21.15107/rcub_cherry_5640

Kojić I. Proučavanje sinergetskog efekta kopirolize lignita i polietilena visoke gustine u otvorenom sistemu - petrografski i geohemijski pristup. in Универзитет у Београду. 2022;.
https://hdl.handle.net/21.15107/rcub_cherry_5640 .

Kojić, Ivan, "Proučavanje sinergetskog efekta kopirolize lignita i polietilena visoke gustine u otvorenom sistemu - petrografski i geohemijski pristup" in Универзитет у Београду (2022),
https://hdl.handle.net/21.15107/rcub_cherry_5640 .

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

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

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

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

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

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

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

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

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

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

TY  - JOUR
AU  - Medić, Ana
AU  - Lješević, Marija
AU  - Inui, Hideyuku
AU  - Beškoski, Vladimir
AU  - Kojić, Ivan
AU  - Stojanović, Ksenija A.
AU  - Karadžić, Ivanka M.
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3995
AB  - Pseudomonas aeruginosa san ai, an alkaliphilic, metallotolerant bacterium, degraded individual selected petroleum compounds, i.e., n-alkanes (n-hexadecane, n-nonadecane) and polycyclic aromatic hydrocarbons (fluorene, phenanthrene, pyrene) with efficiency of 80%, 98%, 96%, 50% and 41%, respectively, at initial concentrations of 20 mg L−1 and in seven days. P. aeruginosa san ai showed a high biodegradative capacity on complex hydrocarbon mixtures, the aliphatic and aromatic fractions from crude oil. The efficiency of P. aeruginosa san ai degradation of crude oil fractions in seven days reached stage 3–4 of the oil biodegradation scale, which ranges from 0 (no biodegradation) to 10 (maximum biodegradation). Identified metabolites concomitant with genomic and enzymatic data indicated the terminal oxidation pathway for the n-alkane degradation, and the salicylate and phthalate pathways for fluorene biodegradation. Polyextremophilic P. aeruginosa san ai, as a biosurfactant producer with multidegradative capacity for hydrocarbons, can be used in an improved strategy for environmental bioremediation of hydrocarbon-contaminated sites, including extreme habitats characterized by low or elevated temperatures, acidic or alkaline pH or high concentrations of heavy metals.
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity
VL  - 10
IS  - 24
SP  - 14060
EP  - 14070
DO  - 10.1039/C9RA10371F
ER  - 

@article{
author = "Medić, Ana and Lješević, Marija and Inui, Hideyuku and Beškoski, Vladimir and Kojić, Ivan and Stojanović, Ksenija A. and Karadžić, Ivanka M.",
year = "2020",
abstract = "Pseudomonas aeruginosa san ai, an alkaliphilic, metallotolerant bacterium, degraded individual selected petroleum compounds, i.e., n-alkanes (n-hexadecane, n-nonadecane) and polycyclic aromatic hydrocarbons (fluorene, phenanthrene, pyrene) with efficiency of 80%, 98%, 96%, 50% and 41%, respectively, at initial concentrations of 20 mg L−1 and in seven days. P. aeruginosa san ai showed a high biodegradative capacity on complex hydrocarbon mixtures, the aliphatic and aromatic fractions from crude oil. The efficiency of P. aeruginosa san ai degradation of crude oil fractions in seven days reached stage 3–4 of the oil biodegradation scale, which ranges from 0 (no biodegradation) to 10 (maximum biodegradation). Identified metabolites concomitant with genomic and enzymatic data indicated the terminal oxidation pathway for the n-alkane degradation, and the salicylate and phthalate pathways for fluorene biodegradation. Polyextremophilic P. aeruginosa san ai, as a biosurfactant producer with multidegradative capacity for hydrocarbons, can be used in an improved strategy for environmental bioremediation of hydrocarbon-contaminated sites, including extreme habitats characterized by low or elevated temperatures, acidic or alkaline pH or high concentrations of heavy metals.",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity",
volume = "10",
number = "24",
pages = "14060-14070",
doi = "10.1039/C9RA10371F"
}

Medić, A., Lješević, M., Inui, H., Beškoski, V., Kojić, I., Stojanović, K. A.,& Karadžić, I. M.. (2020). Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity. in RSC Advances
Royal Society of Chemistry., 10(24), 14060-14070.
https://doi.org/10.1039/C9RA10371F

Medić A, Lješević M, Inui H, Beškoski V, Kojić I, Stojanović KA, Karadžić IM. Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity. in RSC Advances. 2020;10(24):14060-14070.
doi:10.1039/C9RA10371F .

Medić, Ana, Lješević, Marija, Inui, Hideyuku, Beškoski, Vladimir, Kojić, Ivan, Stojanović, Ksenija A., Karadžić, Ivanka M., "Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity" in RSC Advances, 10, no. 24 (2020):14060-14070,
https://doi.org/10.1039/C9RA10371F . .

TY  - DATA
AU  - Medić, Ana
AU  - Lješević, Marija
AU  - Inui, Hideyuku
AU  - Beškoski, Vladimir
AU  - Kojić, Ivan
AU  - Stojanović, Ksenija A.
AU  - Karadžić, Ivanka M.
PY  - 2020
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3996
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - Supplementary data for the article: Medić, A.; Lješević, M.; Inui, H.; Beškoski, V.; Kojić, I.; Stojanović, K.; Karadžić, I. Efficient Biodegradation of Petroleum N-Alkanes and Polycyclic Aromatic Hydrocarbons by Polyextremophilic Pseudomonas Aeruginosa San Ai with Multidegradative Capacity. RSC Adv. 2020, 10 (24), 14060–14070. https://doi.org/10.1039/C9RA10371F
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3996
ER  - 

@misc{
author = "Medić, Ana and Lješević, Marija and Inui, Hideyuku and Beškoski, Vladimir and Kojić, Ivan and Stojanović, Ksenija A. and Karadžić, Ivanka M.",
year = "2020",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "Supplementary data for the article: Medić, A.; Lješević, M.; Inui, H.; Beškoski, V.; Kojić, I.; Stojanović, K.; Karadžić, I. Efficient Biodegradation of Petroleum N-Alkanes and Polycyclic Aromatic Hydrocarbons by Polyextremophilic Pseudomonas Aeruginosa San Ai with Multidegradative Capacity. RSC Adv. 2020, 10 (24), 14060–14070. https://doi.org/10.1039/C9RA10371F",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3996"
}

Medić, A., Lješević, M., Inui, H., Beškoski, V., Kojić, I., Stojanović, K. A.,& Karadžić, I. M.. (2020). Supplementary data for the article: Medić, A.; Lješević, M.; Inui, H.; Beškoski, V.; Kojić, I.; Stojanović, K.; Karadžić, I. Efficient Biodegradation of Petroleum N-Alkanes and Polycyclic Aromatic Hydrocarbons by Polyextremophilic Pseudomonas Aeruginosa San Ai with Multidegradative Capacity. RSC Adv. 2020, 10 (24), 14060–14070. https://doi.org/10.1039/C9RA10371F. in RSC Advances
Royal Society of Chemistry..
https://hdl.handle.net/21.15107/rcub_cherry_3996

Medić A, Lješević M, Inui H, Beškoski V, Kojić I, Stojanović KA, Karadžić IM. Supplementary data for the article: Medić, A.; Lješević, M.; Inui, H.; Beškoski, V.; Kojić, I.; Stojanović, K.; Karadžić, I. Efficient Biodegradation of Petroleum N-Alkanes and Polycyclic Aromatic Hydrocarbons by Polyextremophilic Pseudomonas Aeruginosa San Ai with Multidegradative Capacity. RSC Adv. 2020, 10 (24), 14060–14070. https://doi.org/10.1039/C9RA10371F. in RSC Advances. 2020;.
https://hdl.handle.net/21.15107/rcub_cherry_3996 .

Medić, Ana, Lješević, Marija, Inui, Hideyuku, Beškoski, Vladimir, Kojić, Ivan, Stojanović, Ksenija A., Karadžić, Ivanka M., "Supplementary data for the article: Medić, A.; Lješević, M.; Inui, H.; Beškoski, V.; Kojić, I.; Stojanović, K.; Karadžić, I. Efficient Biodegradation of Petroleum N-Alkanes and Polycyclic Aromatic Hydrocarbons by Polyextremophilic Pseudomonas Aeruginosa San Ai with Multidegradative Capacity. RSC Adv. 2020, 10 (24), 14060–14070. https://doi.org/10.1039/C9RA10371F" in RSC Advances (2020),
https://hdl.handle.net/21.15107/rcub_cherry_3996 .

TY  - JOUR
AU  - Kojić, Ivan
AU  - Bechtel, Achim
AU  - Kittinger, Friedrich
AU  - Stevanović, Nikola R.
AU  - Obradović, Marko
AU  - Stojanović, Ksenija A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2201
AB  - Pyrolysis of high density polyethylene (HDPE) in the open system was studied. A plastic bag for food packing was used as a source of HDPE. Pyrolysis was performed at temperatures of 400, 450 and 500 degrees C, which were chosen based on thermogravimetric analysis. The HDPE pyrolysis yielded liquid, gaseous and solid products. Temperature rise resulted in the increase of conversion of HDPE into liquid and gaseous products. The main constituents of liquid pyrolysates are 1-n-alkenes, n-alkanes and terminal n-dienes. The composition of liquid products indicates that the performed pyrolysis of HDPE could not serve as a standalone operation for the production of gasoline or diesel, but preferably as a pre-treatment to yield a product to be blended into a refinery or petrochemical feed stream. The advantage of a liquid pyrolysate in comparison to crude oil is the extremely low content of aromatic hydrocarbons and the absence of polar compounds. The gaseous products have desirable composition and consist mainly of methane and ethene. The solid residues do not produce ash by combustion and have high calorific values. Co-pyrolysis of HDPE with mineral-rich lignite indicated positive synergetic effect at 450 and 500 degrees C, which is reflected through the increased experimental yields of liquid and gaseous products in comparison to theoretical ones.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite
VL  - 83
IS  - 7-8
SP  - 923
EP  - 940
DO  - 10.2298/JSC171215027K
ER  - 

@article{
author = "Kojić, Ivan and Bechtel, Achim and Kittinger, Friedrich and Stevanović, Nikola R. and Obradović, Marko and Stojanović, Ksenija A.",
year = "2018",
abstract = "Pyrolysis of high density polyethylene (HDPE) in the open system was studied. A plastic bag for food packing was used as a source of HDPE. Pyrolysis was performed at temperatures of 400, 450 and 500 degrees C, which were chosen based on thermogravimetric analysis. The HDPE pyrolysis yielded liquid, gaseous and solid products. Temperature rise resulted in the increase of conversion of HDPE into liquid and gaseous products. The main constituents of liquid pyrolysates are 1-n-alkenes, n-alkanes and terminal n-dienes. The composition of liquid products indicates that the performed pyrolysis of HDPE could not serve as a standalone operation for the production of gasoline or diesel, but preferably as a pre-treatment to yield a product to be blended into a refinery or petrochemical feed stream. The advantage of a liquid pyrolysate in comparison to crude oil is the extremely low content of aromatic hydrocarbons and the absence of polar compounds. The gaseous products have desirable composition and consist mainly of methane and ethene. The solid residues do not produce ash by combustion and have high calorific values. Co-pyrolysis of HDPE with mineral-rich lignite indicated positive synergetic effect at 450 and 500 degrees C, which is reflected through the increased experimental yields of liquid and gaseous products in comparison to theoretical ones.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite",
volume = "83",
number = "7-8",
pages = "923-940",
doi = "10.2298/JSC171215027K"
}

Kojić, I., Bechtel, A., Kittinger, F., Stevanović, N. R., Obradović, M.,& Stojanović, K. A.. (2018). Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 83(7-8), 923-940.
https://doi.org/10.2298/JSC171215027K

Kojić I, Bechtel A, Kittinger F, Stevanović NR, Obradović M, Stojanović KA. Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite. in Journal of the Serbian Chemical Society. 2018;83(7-8):923-940.
doi:10.2298/JSC171215027K .

Kojić, Ivan, Bechtel, Achim, Kittinger, Friedrich, Stevanović, Nikola R., Obradović, Marko, Stojanović, Ksenija A., "Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite" in Journal of the Serbian Chemical Society, 83, no. 7-8 (2018):923-940,
https://doi.org/10.2298/JSC171215027K . .

TY  - DATA
AU  - Kojić, Ivan
AU  - Bechtel, Achim
AU  - Kittinger, Friedrich
AU  - Stevanović, Nikola R.
AU  - Obradović, Marko
AU  - Stojanović, Ksenija A.
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3306
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Supplementary data for the article: Kojic, I.; Bechtel, A.; Kittinger, F.; Stevanovic, N.; Obradovic, M.; Stojanovic, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis with Lignite. J. Serb. Chem. Soc. 2018, 83 (7–8), 923–940. https://doi.org/10.2298/JSC171215027K
UR  - https://hdl.handle.net/21.15107/rcub_cherry_3306
ER  - 

@misc{
author = "Kojić, Ivan and Bechtel, Achim and Kittinger, Friedrich and Stevanović, Nikola R. and Obradović, Marko and Stojanović, Ksenija A.",
year = "2018",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Supplementary data for the article: Kojic, I.; Bechtel, A.; Kittinger, F.; Stevanovic, N.; Obradovic, M.; Stojanovic, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis with Lignite. J. Serb. Chem. Soc. 2018, 83 (7–8), 923–940. https://doi.org/10.2298/JSC171215027K",
url = "https://hdl.handle.net/21.15107/rcub_cherry_3306"
}

Kojić, I., Bechtel, A., Kittinger, F., Stevanović, N. R., Obradović, M.,& Stojanović, K. A.. (2018). Supplementary data for the article: Kojic, I.; Bechtel, A.; Kittinger, F.; Stevanovic, N.; Obradovic, M.; Stojanovic, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis with Lignite. J. Serb. Chem. Soc. 2018, 83 (7–8), 923–940. https://doi.org/10.2298/JSC171215027K. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade..
https://hdl.handle.net/21.15107/rcub_cherry_3306

Kojić I, Bechtel A, Kittinger F, Stevanović NR, Obradović M, Stojanović KA. Supplementary data for the article: Kojic, I.; Bechtel, A.; Kittinger, F.; Stevanovic, N.; Obradovic, M.; Stojanovic, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis with Lignite. J. Serb. Chem. Soc. 2018, 83 (7–8), 923–940. https://doi.org/10.2298/JSC171215027K. in Journal of the Serbian Chemical Society. 2018;.
https://hdl.handle.net/21.15107/rcub_cherry_3306 .

Kojić, Ivan, Bechtel, Achim, Kittinger, Friedrich, Stevanović, Nikola R., Obradović, Marko, Stojanović, Ksenija A., "Supplementary data for the article: Kojic, I.; Bechtel, A.; Kittinger, F.; Stevanovic, N.; Obradovic, M.; Stojanovic, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis with Lignite. J. Serb. Chem. Soc. 2018, 83 (7–8), 923–940. https://doi.org/10.2298/JSC171215027K" in Journal of the Serbian Chemical Society (2018),
https://hdl.handle.net/21.15107/rcub_cherry_3306 .