TY  - JOUR
AU  - Marić, Nenad
AU  - Strbacki, Jana
AU  - Mrazovac Kurilić, Sanja
AU  - Beskoski, Vladimir P.
AU  - Nikić, Zoran
AU  - Ignjatović, Snežana
AU  - Malbasić, Jovana
PY  - 2020
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1123
AB  - Aquifer contamination by petroleum hydrocarbons leads to measurable changes of groundwater hydrochemistry, primarily due to the microbiological activity. This study analyzes this phenomenon at an historical kerosene-contaminated site in Vitanovac (central Serbia). Due to the long-term hydrocarbon contamination and exposure to aerobic and anaerobic biodegradation mechanisms, the lowest concentrations of O-2, NO3-, and SO42- (electron acceptors) and the highest concentrations of Mn and Fe (products of microbial metabolic activity) overlap. The terminal redox-accepting processes in groundwater ranged from oxygen reduction to sulfate reduction. The most anoxic processes were registered in piezometers closest to the source of contamination, as was also confirmed by the redox potential (Eh) measurements. High electrical conductivity values and the highest TOC, SiO2, and Al concentrations also overlap in the contaminated zone close to the source of contamination. Scanning electron microscopy study of quartz grains from the zone undergoing the impact of biodegradation confirmed the occurrence of weathering microscale processes on mineral surfaces. Taking all these factors together, it seems reasonable to assume that microbiological activity has caused the enhanced weathering of silicate minerals.
T2  - Environmental Geochemistry and Health
T1  - Hydrochemistry of groundwater contaminated by petroleum hydrocarbons: the impact of biodegradation (Vitanovac, Serbia)
EP  - 1935
IS  - 7
SP  - 1921
VL  - 42
DO  - 10.1007/s10653-019-00462-9
UR  - conv_1461
ER  - 

@article{
author = "Marić, Nenad and Strbacki, Jana and Mrazovac Kurilić, Sanja and Beskoski, Vladimir P. and Nikić, Zoran and Ignjatović, Snežana and Malbasić, Jovana",
year = "2020",
abstract = "Aquifer contamination by petroleum hydrocarbons leads to measurable changes of groundwater hydrochemistry, primarily due to the microbiological activity. This study analyzes this phenomenon at an historical kerosene-contaminated site in Vitanovac (central Serbia). Due to the long-term hydrocarbon contamination and exposure to aerobic and anaerobic biodegradation mechanisms, the lowest concentrations of O-2, NO3-, and SO42- (electron acceptors) and the highest concentrations of Mn and Fe (products of microbial metabolic activity) overlap. The terminal redox-accepting processes in groundwater ranged from oxygen reduction to sulfate reduction. The most anoxic processes were registered in piezometers closest to the source of contamination, as was also confirmed by the redox potential (Eh) measurements. High electrical conductivity values and the highest TOC, SiO2, and Al concentrations also overlap in the contaminated zone close to the source of contamination. Scanning electron microscopy study of quartz grains from the zone undergoing the impact of biodegradation confirmed the occurrence of weathering microscale processes on mineral surfaces. Taking all these factors together, it seems reasonable to assume that microbiological activity has caused the enhanced weathering of silicate minerals.",
journal = "Environmental Geochemistry and Health",
title = "Hydrochemistry of groundwater contaminated by petroleum hydrocarbons: the impact of biodegradation (Vitanovac, Serbia)",
pages = "1935-1921",
number = "7",
volume = "42",
doi = "10.1007/s10653-019-00462-9",
url = "conv_1461"
}

Marić, N., Strbacki, J., Mrazovac Kurilić, S., Beskoski, V. P., Nikić, Z., Ignjatović, S.,& Malbasić, J.. (2020). Hydrochemistry of groundwater contaminated by petroleum hydrocarbons: the impact of biodegradation (Vitanovac, Serbia). in Environmental Geochemistry and Health, 42(7), 1921-1935.
https://doi.org/10.1007/s10653-019-00462-9
conv_1461

Marić N, Strbacki J, Mrazovac Kurilić S, Beskoski VP, Nikić Z, Ignjatović S, Malbasić J. Hydrochemistry of groundwater contaminated by petroleum hydrocarbons: the impact of biodegradation (Vitanovac, Serbia). in Environmental Geochemistry and Health. 2020;42(7):1921-1935.
doi:10.1007/s10653-019-00462-9
conv_1461 .

Marić, Nenad, Strbacki, Jana, Mrazovac Kurilić, Sanja, Beskoski, Vladimir P., Nikić, Zoran, Ignjatović, Snežana, Malbasić, Jovana, "Hydrochemistry of groundwater contaminated by petroleum hydrocarbons: the impact of biodegradation (Vitanovac, Serbia)" in Environmental Geochemistry and Health, 42, no. 7 (2020):1921-1935,
https://doi.org/10.1007/s10653-019-00462-9 .,
conv_1461 .

TY  - JOUR
AU  - Nikić, Zoran
AU  - Pušić, Milenko
AU  - Papić, Petar
AU  - Marić, Nenad
PY  - 2020
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1138
AB  - A part of the Balkan ultramafic massif is situated in western Serbia and belongs to a mountain range with several prominent peaks, including Mt. Tara, Mt. Zlatibor, and Mt. Zlatar. The porosity of ultramafic rocks is generally very low, such that they are classified as nearly or completely waterless rocks. However, due to tectonic activity and exogenic processes over geologic time, some ultramafic rocks exhibit a certain level of secondary fracture porosity. Hydraulically interconnected fractures can form aquifers of the fractured type, such as the one found in Gruda on Mt. Zlatibor. On this location, the quality parameters of the groundwater in the fractured aquifer, drained via a spring called Bijela eesma, prompted detailed multidisciplinary investigations aimed at defining the elements of the aquifer for commercial water bottling purposes. Given that the investigations were comprehensive, the results allowed high-quality interpretation of the hydrogeologic conditions and provided the background for developing a hydrodynamic model of the fractured hydrogeologic system in the ultramafic rocks at Gruda. Modfiow software was used for modeling. This software is primarily intended for intergranular aquifers, but no programs are available for fractured aquifers in hard rocks with pronounced discontinuities. Modeling of the fractured aquifer in the ultramafic rocks at Gruda provided the following information: size of active infiltration surface, hydraulic conductivity of the porous medium, rate of recharge, residence time of a drop of groundwater from entry to exit, graphical representation of streamlines, and the like. Despite these difficulties, the results are satisfactory. The values of the analyzed parameters are believed to be objective and indicate a certain possibility of using Modflow in hydrodynamic modeling and solving hydrogeologic problems that involve hard rocks and fractured porosity. In practice, this is especially important for sanitary protection zoning of groundwater sources that rely on fractured aquifers.
T2  - Journal of Hydrology
T1  - Hydrodynamic model of hydrogeologic fracture system in Gruda ultramafic rocks, western Serbia
VL  - 580
DO  - 10.1016/j.jhydrol.2019.124268
UR  - conv_1478
ER  - 

@article{
author = "Nikić, Zoran and Pušić, Milenko and Papić, Petar and Marić, Nenad",
year = "2020",
abstract = "A part of the Balkan ultramafic massif is situated in western Serbia and belongs to a mountain range with several prominent peaks, including Mt. Tara, Mt. Zlatibor, and Mt. Zlatar. The porosity of ultramafic rocks is generally very low, such that they are classified as nearly or completely waterless rocks. However, due to tectonic activity and exogenic processes over geologic time, some ultramafic rocks exhibit a certain level of secondary fracture porosity. Hydraulically interconnected fractures can form aquifers of the fractured type, such as the one found in Gruda on Mt. Zlatibor. On this location, the quality parameters of the groundwater in the fractured aquifer, drained via a spring called Bijela eesma, prompted detailed multidisciplinary investigations aimed at defining the elements of the aquifer for commercial water bottling purposes. Given that the investigations were comprehensive, the results allowed high-quality interpretation of the hydrogeologic conditions and provided the background for developing a hydrodynamic model of the fractured hydrogeologic system in the ultramafic rocks at Gruda. Modfiow software was used for modeling. This software is primarily intended for intergranular aquifers, but no programs are available for fractured aquifers in hard rocks with pronounced discontinuities. Modeling of the fractured aquifer in the ultramafic rocks at Gruda provided the following information: size of active infiltration surface, hydraulic conductivity of the porous medium, rate of recharge, residence time of a drop of groundwater from entry to exit, graphical representation of streamlines, and the like. Despite these difficulties, the results are satisfactory. The values of the analyzed parameters are believed to be objective and indicate a certain possibility of using Modflow in hydrodynamic modeling and solving hydrogeologic problems that involve hard rocks and fractured porosity. In practice, this is especially important for sanitary protection zoning of groundwater sources that rely on fractured aquifers.",
journal = "Journal of Hydrology",
title = "Hydrodynamic model of hydrogeologic fracture system in Gruda ultramafic rocks, western Serbia",
volume = "580",
doi = "10.1016/j.jhydrol.2019.124268",
url = "conv_1478"
}

Nikić, Z., Pušić, M., Papić, P.,& Marić, N.. (2020). Hydrodynamic model of hydrogeologic fracture system in Gruda ultramafic rocks, western Serbia. in Journal of Hydrology, 580.
https://doi.org/10.1016/j.jhydrol.2019.124268
conv_1478

Nikić Z, Pušić M, Papić P, Marić N. Hydrodynamic model of hydrogeologic fracture system in Gruda ultramafic rocks, western Serbia. in Journal of Hydrology. 2020;580.
doi:10.1016/j.jhydrol.2019.124268
conv_1478 .

Nikić, Zoran, Pušić, Milenko, Papić, Petar, Marić, Nenad, "Hydrodynamic model of hydrogeologic fracture system in Gruda ultramafic rocks, western Serbia" in Journal of Hydrology, 580 (2020),
https://doi.org/10.1016/j.jhydrol.2019.124268 .,
conv_1478 .

TY  - JOUR
AU  - Marić, Nenad
AU  - Matić, Ivan
AU  - Papić, Petar
AU  - Beskoski, Vladimir P.
AU  - Ilić, Mila
AU  - Gojgić-Cvijović, Gordana
AU  - Miletić, Srdan
AU  - Nikić, Zoran
AU  - Vrvić, Miroslav M.
PY  - 2018
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/921
AB  - The role of natural attenuation processes in groundwater contamination by petroleum hydrocarbons is of intense scientific and practical interest. This study provides insight into the biodegradation effects in groundwater at a site contaminated by kerosene (jet fuel) in 1993 (Vitanovac, Serbia). Total petroleum hydrocarbons (TPH), hydrochemical indicators (O-2 , NO3-, Mn, Fe, SO42-, HCO3- ), delta C-13 of dissolved inorganic carbon (DIC), and other parameters were measured to demonstrate biodegradation effects in groundwater at the contaminated site. Due to different biodegradation mechanisms, the zone of the lowest concentrations of electron acceptors and the zone of the highest concentrations of metabolic products of biodegradation overlap. Based on the analysis of redox-sensitive compounds in groundwater samples, redox processes ranged from strictly anoxic (methanogenesis) to oxic (oxygen reduction) within a short distance. The dependence of groundwater redox conditions on the distance from the source of contamination was observed. delta C-13 values of DIC ranged from -15.83 to -2.75 parts per thousand, and the most positive values correspond to the zone under anaerobic and methanogenic conditions. Overall, results obtained provide clear evidence on the effects of natural attenuation processes-the activity of biodegradation mechanisms in field conditions.
T2  - Environmental Monitoring and Assessment
T1  - Natural attenuation of petroleum hydrocarbons-a study of biodegradation effects in groundwater (Vitanovac, Serbia)
IS  - 2
VL  - 190
DO  - 10.1007/s10661-018-6462-4
UR  - conv_1327
ER  - 

@article{
author = "Marić, Nenad and Matić, Ivan and Papić, Petar and Beskoski, Vladimir P. and Ilić, Mila and Gojgić-Cvijović, Gordana and Miletić, Srdan and Nikić, Zoran and Vrvić, Miroslav M.",
year = "2018",
abstract = "The role of natural attenuation processes in groundwater contamination by petroleum hydrocarbons is of intense scientific and practical interest. This study provides insight into the biodegradation effects in groundwater at a site contaminated by kerosene (jet fuel) in 1993 (Vitanovac, Serbia). Total petroleum hydrocarbons (TPH), hydrochemical indicators (O-2 , NO3-, Mn, Fe, SO42-, HCO3- ), delta C-13 of dissolved inorganic carbon (DIC), and other parameters were measured to demonstrate biodegradation effects in groundwater at the contaminated site. Due to different biodegradation mechanisms, the zone of the lowest concentrations of electron acceptors and the zone of the highest concentrations of metabolic products of biodegradation overlap. Based on the analysis of redox-sensitive compounds in groundwater samples, redox processes ranged from strictly anoxic (methanogenesis) to oxic (oxygen reduction) within a short distance. The dependence of groundwater redox conditions on the distance from the source of contamination was observed. delta C-13 values of DIC ranged from -15.83 to -2.75 parts per thousand, and the most positive values correspond to the zone under anaerobic and methanogenic conditions. Overall, results obtained provide clear evidence on the effects of natural attenuation processes-the activity of biodegradation mechanisms in field conditions.",
journal = "Environmental Monitoring and Assessment",
title = "Natural attenuation of petroleum hydrocarbons-a study of biodegradation effects in groundwater (Vitanovac, Serbia)",
number = "2",
volume = "190",
doi = "10.1007/s10661-018-6462-4",
url = "conv_1327"
}

Marić, N., Matić, I., Papić, P., Beskoski, V. P., Ilić, M., Gojgić-Cvijović, G., Miletić, S., Nikić, Z.,& Vrvić, M. M.. (2018). Natural attenuation of petroleum hydrocarbons-a study of biodegradation effects in groundwater (Vitanovac, Serbia). in Environmental Monitoring and Assessment, 190(2).
https://doi.org/10.1007/s10661-018-6462-4
conv_1327

Marić N, Matić I, Papić P, Beskoski VP, Ilić M, Gojgić-Cvijović G, Miletić S, Nikić Z, Vrvić MM. Natural attenuation of petroleum hydrocarbons-a study of biodegradation effects in groundwater (Vitanovac, Serbia). in Environmental Monitoring and Assessment. 2018;190(2).
doi:10.1007/s10661-018-6462-4
conv_1327 .

Marić, Nenad, Matić, Ivan, Papić, Petar, Beskoski, Vladimir P., Ilić, Mila, Gojgić-Cvijović, Gordana, Miletić, Srdan, Nikić, Zoran, Vrvić, Miroslav M., "Natural attenuation of petroleum hydrocarbons-a study of biodegradation effects in groundwater (Vitanovac, Serbia)" in Environmental Monitoring and Assessment, 190, no. 2 (2018),
https://doi.org/10.1007/s10661-018-6462-4 .,
conv_1327 .

TY  - CONF
AU  - Marić, Nenad
AU  - Nikić, Zoran
PY  - 2018
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/978
AB  - Once released in the environment, petroleum hydrocarbons can be long-term sources of contamination. The main advantage of bioremediation compared to conventional remediation treatments is its reduced cost. Natural attenuation is the passive bioremediation approach that relies on natural processes to reduce contamination. This study provides insight into the natural attenuation processes in groundwater in the alluvial deposits of the Zapadna Morava River (the site of historical contamination by kerosene in Vitanovac, Kraljevo, Serbia). Monitoring was performed in the direction of groundwater flow, downgradient from the source of contamination. Groundwater samples were analyzed for the following parameters: total petroleum hydrocarbons (TPH), O-2, NO3-, Mn, Fe and SO42-. TPH concentrations declined in groundwater across the site, and were accompanied by increasing concentrations of electron acceptors (O-2, NO3-, SO42-) and decreasing concentrations of metabolic products of biodegradation (Mn, Fe). The observed trends provide strong evidence of the activity of different biodegradation mechanisms at this site (aerobic respiration, nitrate reduction, reduction of manganese (IV), reduction of iron (III) and sulfate reduction). The results obtained confirm the natural occurrence of aerobic and anaerobic biodegradation mechanisms in this phreatic aquifer contaminated by petroleum hydrocarbons 20 years ago. However, use of natural attenuation as a cost-effective remediation alternative depends on its capacity to ensure protection of public health, safety and the environment.
C3  - Soil and Water Resources Protection in the Changing Environment
T1  - Potential of natural attenuation processes in environmental contamination by petroleum hydrocarbons
EP  - 53
SP  - 44
VL  - 45
UR  - conv_1409
ER  - 

@conference{
author = "Marić, Nenad and Nikić, Zoran",
year = "2018",
abstract = "Once released in the environment, petroleum hydrocarbons can be long-term sources of contamination. The main advantage of bioremediation compared to conventional remediation treatments is its reduced cost. Natural attenuation is the passive bioremediation approach that relies on natural processes to reduce contamination. This study provides insight into the natural attenuation processes in groundwater in the alluvial deposits of the Zapadna Morava River (the site of historical contamination by kerosene in Vitanovac, Kraljevo, Serbia). Monitoring was performed in the direction of groundwater flow, downgradient from the source of contamination. Groundwater samples were analyzed for the following parameters: total petroleum hydrocarbons (TPH), O-2, NO3-, Mn, Fe and SO42-. TPH concentrations declined in groundwater across the site, and were accompanied by increasing concentrations of electron acceptors (O-2, NO3-, SO42-) and decreasing concentrations of metabolic products of biodegradation (Mn, Fe). The observed trends provide strong evidence of the activity of different biodegradation mechanisms at this site (aerobic respiration, nitrate reduction, reduction of manganese (IV), reduction of iron (III) and sulfate reduction). The results obtained confirm the natural occurrence of aerobic and anaerobic biodegradation mechanisms in this phreatic aquifer contaminated by petroleum hydrocarbons 20 years ago. However, use of natural attenuation as a cost-effective remediation alternative depends on its capacity to ensure protection of public health, safety and the environment.",
journal = "Soil and Water Resources Protection in the Changing Environment",
title = "Potential of natural attenuation processes in environmental contamination by petroleum hydrocarbons",
pages = "53-44",
volume = "45",
url = "conv_1409"
}

Marić, N.,& Nikić, Z.. (2018). Potential of natural attenuation processes in environmental contamination by petroleum hydrocarbons. in Soil and Water Resources Protection in the Changing Environment, 45, 44-53.
conv_1409

Marić N, Nikić Z. Potential of natural attenuation processes in environmental contamination by petroleum hydrocarbons. in Soil and Water Resources Protection in the Changing Environment. 2018;45:44-53.
conv_1409 .

Marić, Nenad, Nikić, Zoran, "Potential of natural attenuation processes in environmental contamination by petroleum hydrocarbons" in Soil and Water Resources Protection in the Changing Environment, 45 (2018):44-53,
conv_1409 .

TY  - JOUR
AU  - Nikić, Zoran
AU  - Srecković-Batocanin, Danica
AU  - Burazer, Milenko
AU  - Ristić, Ratko
AU  - Papić, Petar
AU  - Nikolić, Vesna
PY  - 2013
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/564
AB  - Ultramafic rocks are generally taken to be 'waterless' or bearing little water. The mountain Zlatibor, western Serbia, largely built of Upper Jurassic ultramafics, is without perennial springs. However, in Gruda, an area on the NE side of Zlatibor, there are two perennial ascending springs with uniform discharge: Bijela esma and Hajduko Vrelo. The water from both springs is naturally mildly alkaline (pH similar to 8.4), of Mg-HCO3 type, and temperature similar to 11 A degrees C. The springs have been investigated with respect to derivation, dynamics and chemistry with a view to commercial use of the water. The results indicate zones of rocks fractured during tectonic events and/or under lithostatic pressure. Deep ultramafic rocks, equivalent to abyssal peridotites (the least depleted rocks of the upper mantle, rich in magnesium), include fractured aquifers characterized by heterogeneity and anisotropy. Groundwater arriving at the land surface derives from atmospheric precipitation, and its quality is converted through the process of serpentine acid hydrolysis into mildly alkaline Mg-HCO3 water. Both quantity and quality of water from these springs are stable and are unaffected by atmospheric precipitation or other external influences. A conceptual model of the structure, hydrogeological character of the aquifer, and the mechanism of groundwater derivation is developed for both springs.
T2  - Hydrogeology Journal
T1  - A conceptual model of mildly alkaline water discharging from the Zlatibor ultramafic massif, western Serbia
EP  - 1163
IS  - 5
SP  - 1147
VL  - 21
DO  - 10.1007/s10040-013-0983-2
UR  - conv_1087
ER  - 

@article{
author = "Nikić, Zoran and Srecković-Batocanin, Danica and Burazer, Milenko and Ristić, Ratko and Papić, Petar and Nikolić, Vesna",
year = "2013",
abstract = "Ultramafic rocks are generally taken to be 'waterless' or bearing little water. The mountain Zlatibor, western Serbia, largely built of Upper Jurassic ultramafics, is without perennial springs. However, in Gruda, an area on the NE side of Zlatibor, there are two perennial ascending springs with uniform discharge: Bijela esma and Hajduko Vrelo. The water from both springs is naturally mildly alkaline (pH similar to 8.4), of Mg-HCO3 type, and temperature similar to 11 A degrees C. The springs have been investigated with respect to derivation, dynamics and chemistry with a view to commercial use of the water. The results indicate zones of rocks fractured during tectonic events and/or under lithostatic pressure. Deep ultramafic rocks, equivalent to abyssal peridotites (the least depleted rocks of the upper mantle, rich in magnesium), include fractured aquifers characterized by heterogeneity and anisotropy. Groundwater arriving at the land surface derives from atmospheric precipitation, and its quality is converted through the process of serpentine acid hydrolysis into mildly alkaline Mg-HCO3 water. Both quantity and quality of water from these springs are stable and are unaffected by atmospheric precipitation or other external influences. A conceptual model of the structure, hydrogeological character of the aquifer, and the mechanism of groundwater derivation is developed for both springs.",
journal = "Hydrogeology Journal",
title = "A conceptual model of mildly alkaline water discharging from the Zlatibor ultramafic massif, western Serbia",
pages = "1163-1147",
number = "5",
volume = "21",
doi = "10.1007/s10040-013-0983-2",
url = "conv_1087"
}

Nikić, Z., Srecković-Batocanin, D., Burazer, M., Ristić, R., Papić, P.,& Nikolić, V.. (2013). A conceptual model of mildly alkaline water discharging from the Zlatibor ultramafic massif, western Serbia. in Hydrogeology Journal, 21(5), 1147-1163.
https://doi.org/10.1007/s10040-013-0983-2
conv_1087

Nikić Z, Srecković-Batocanin D, Burazer M, Ristić R, Papić P, Nikolić V. A conceptual model of mildly alkaline water discharging from the Zlatibor ultramafic massif, western Serbia. in Hydrogeology Journal. 2013;21(5):1147-1163.
doi:10.1007/s10040-013-0983-2
conv_1087 .

Nikić, Zoran, Srecković-Batocanin, Danica, Burazer, Milenko, Ristić, Ratko, Papić, Petar, Nikolić, Vesna, "A conceptual model of mildly alkaline water discharging from the Zlatibor ultramafic massif, western Serbia" in Hydrogeology Journal, 21, no. 5 (2013):1147-1163,
https://doi.org/10.1007/s10040-013-0983-2 .,
conv_1087 .