TY  - JOUR
AU  - Miljević, Nada R.
AU  - Boreli-Zdravkovic, Djulija
AU  - Obradović, Vesna
AU  - Golobočanin, Dušan D.
AU  - Mayer, Bernhard
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4941
AB  - This paper describes the use of the dual isotope method involving delta N-15 and delta O-18 measurements of dissolved nitrates to assess the origin and fate of groundwater nitrate at the Kljuc groundwater source, Serbia. A sampling campaign was conducted in September 2007 during flow conditions obtaining groundwater from observation wells and river water fed by a shallow aquifer hosted in alluvial (sandy-gravel) sediments. Nitrate isotope ratios ranged from +5.3 to +16.9 parts per thousand and delta O-18(NO3) values varied from -2.3 to +5.0%. Two major contamination sources were identified with isotopic compositions characteristic for nitrate derived from nitrification of soil organic nitrogen (+5.3 to +7.8% for delta N-15) resulting in nitrate concentrations of 33.6 and 78.8 mg/L and nitrate derived from animal wastes or human sewage, e. g. via septic systems, yielding delta N-15 values of +9.9 to +11.9 parts per thousand and elevated nitrate concentrations of 31.2-245.8 mg/L. The occurrence of nitrification and denitrification was also revealed based on concentration and isotope data for dissolved nitrate.
T2  - Water Science and Technology
T1  - Evaluation of the origin of nitrate influencing the Kljuc groundwater source, Serbia
VL  - 66
IS  - 3
SP  - 472
EP  - 478
DO  - 10.2166/wst.2012.179
ER  - 

@article{
author = "Miljević, Nada R. and Boreli-Zdravkovic, Djulija and Obradović, Vesna and Golobočanin, Dušan D. and Mayer, Bernhard",
year = "2012",
abstract = "This paper describes the use of the dual isotope method involving delta N-15 and delta O-18 measurements of dissolved nitrates to assess the origin and fate of groundwater nitrate at the Kljuc groundwater source, Serbia. A sampling campaign was conducted in September 2007 during flow conditions obtaining groundwater from observation wells and river water fed by a shallow aquifer hosted in alluvial (sandy-gravel) sediments. Nitrate isotope ratios ranged from +5.3 to +16.9 parts per thousand and delta O-18(NO3) values varied from -2.3 to +5.0%. Two major contamination sources were identified with isotopic compositions characteristic for nitrate derived from nitrification of soil organic nitrogen (+5.3 to +7.8% for delta N-15) resulting in nitrate concentrations of 33.6 and 78.8 mg/L and nitrate derived from animal wastes or human sewage, e. g. via septic systems, yielding delta N-15 values of +9.9 to +11.9 parts per thousand and elevated nitrate concentrations of 31.2-245.8 mg/L. The occurrence of nitrification and denitrification was also revealed based on concentration and isotope data for dissolved nitrate.",
journal = "Water Science and Technology",
title = "Evaluation of the origin of nitrate influencing the Kljuc groundwater source, Serbia",
volume = "66",
number = "3",
pages = "472-478",
doi = "10.2166/wst.2012.179"
}

Miljević, N. R., Boreli-Zdravkovic, D., Obradović, V., Golobočanin, D. D.,& Mayer, B.. (2012). Evaluation of the origin of nitrate influencing the Kljuc groundwater source, Serbia. in Water Science and Technology, 66(3), 472-478.
https://doi.org/10.2166/wst.2012.179

Miljević NR, Boreli-Zdravkovic D, Obradović V, Golobočanin DD, Mayer B. Evaluation of the origin of nitrate influencing the Kljuc groundwater source, Serbia. in Water Science and Technology. 2012;66(3):472-478.
doi:10.2166/wst.2012.179 .

Miljević, Nada R., Boreli-Zdravkovic, Djulija, Obradović, Vesna, Golobočanin, Dušan D., Mayer, Bernhard, "Evaluation of the origin of nitrate influencing the Kljuc groundwater source, Serbia" in Water Science and Technology, 66, no. 3 (2012):472-478,
https://doi.org/10.2166/wst.2012.179 . .

TY  - JOUR
AU  - Mitrović, Tatjana
AU  - Obradović, Vesna
AU  - Golobočanin, Dušan D.
AU  - Ogrinc, Nives
AU  - Miljević, Nada R.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4027
AB  - This paper presents the results of hydrological, physicochemical, biological, and isotopic investigations of the Danube River along the stretch through Serbian territory conducted during four campaigns in September and November 2007, September 2008 and April 2009. The stable isotope values exhibited significant changes both in the Danube (-10.7 to -9.5% for delta(18)O and -73.7 to -67.1% for delta(2)H) and in its tributaries (-9.1 to -8.5% for delta(18)O and -69.4 to -59.4% for delta(2)H) depending on the time of survey, which could be partly attributed to the influences of seasonal effects. Results emphasise the dominant role of tributaries inflows from aquifers along the Danube. The very narrow range of delta(13)C(POC) (from -28.9 to -27.4%) was associated with relatively high C/N ratios (C/N GT 9), and together with delta(15)N(TPN) values, the date suggested that, in early spring, a major fraction of particulate organic matter was derived from allochthonous matter. An orthogonal varimax rotation of the principal components analysis identified four latent factors (mineral related, biological, hardness, and soil inlets) which are responsible for the data structure covering 79% of the observed variations among the variables studied. A reliable grouping of samples with respect to the season was found.
T2  - Isotopes in Environmental and Health Studies
T1  - Spatial and temporal variability of stable isotopes and biological parameters for the Danube River in Serbia
VL  - 46
IS  - 2
SP  - 166
EP  - 179
DO  - 10.1080/10256016.2010.488726
ER  - 

@article{
author = "Mitrović, Tatjana and Obradović, Vesna and Golobočanin, Dušan D. and Ogrinc, Nives and Miljević, Nada R.",
year = "2010",
abstract = "This paper presents the results of hydrological, physicochemical, biological, and isotopic investigations of the Danube River along the stretch through Serbian territory conducted during four campaigns in September and November 2007, September 2008 and April 2009. The stable isotope values exhibited significant changes both in the Danube (-10.7 to -9.5% for delta(18)O and -73.7 to -67.1% for delta(2)H) and in its tributaries (-9.1 to -8.5% for delta(18)O and -69.4 to -59.4% for delta(2)H) depending on the time of survey, which could be partly attributed to the influences of seasonal effects. Results emphasise the dominant role of tributaries inflows from aquifers along the Danube. The very narrow range of delta(13)C(POC) (from -28.9 to -27.4%) was associated with relatively high C/N ratios (C/N GT 9), and together with delta(15)N(TPN) values, the date suggested that, in early spring, a major fraction of particulate organic matter was derived from allochthonous matter. An orthogonal varimax rotation of the principal components analysis identified four latent factors (mineral related, biological, hardness, and soil inlets) which are responsible for the data structure covering 79% of the observed variations among the variables studied. A reliable grouping of samples with respect to the season was found.",
journal = "Isotopes in Environmental and Health Studies",
title = "Spatial and temporal variability of stable isotopes and biological parameters for the Danube River in Serbia",
volume = "46",
number = "2",
pages = "166-179",
doi = "10.1080/10256016.2010.488726"
}

Mitrović, T., Obradović, V., Golobočanin, D. D., Ogrinc, N.,& Miljević, N. R.. (2010). Spatial and temporal variability of stable isotopes and biological parameters for the Danube River in Serbia. in Isotopes in Environmental and Health Studies, 46(2), 166-179.
https://doi.org/10.1080/10256016.2010.488726

Mitrović T, Obradović V, Golobočanin DD, Ogrinc N, Miljević NR. Spatial and temporal variability of stable isotopes and biological parameters for the Danube River in Serbia. in Isotopes in Environmental and Health Studies. 2010;46(2):166-179.
doi:10.1080/10256016.2010.488726 .

Mitrović, Tatjana, Obradović, Vesna, Golobočanin, Dušan D., Ogrinc, Nives, Miljević, Nada R., "Spatial and temporal variability of stable isotopes and biological parameters for the Danube River in Serbia" in Isotopes in Environmental and Health Studies, 46, no. 2 (2010):166-179,
https://doi.org/10.1080/10256016.2010.488726 . .