TY  - JOUR
AU  - Ilijević, Konstantin
AU  - Gržetić, Ivan
AU  - Zivadinovic, Ivan
AU  - Popović, Aleksandar R.
PY  - 2012
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5757
AB  - Seasonal spatial and temporal changes of selected eco-chemical parameters in section of the Danube River flowing through Serbia were analyzed. Data for electrical conductivity (EC), dry and suspended matter, residue on ignition, chemical oxygen demand (COD), biochemical oxygen demand (BOD-5), ultraviolet extinction, dissolved oxygen (DO), oxygen saturation, pH, nitrates, total phosphorus, and nitrogen were collected between 1992 and 2006. The use of monthly medians combined with linear regression and two-sided t test has been proven to be the best approach for resolving trends from natural variability of investigated parameters and for determining trend significance. Patterns of temporal changes between different months were examined. It was also determined that spatial trends of some parameters oscillate in predictable manner, increasing in one part of the year and declining in the other. Regression slope coefficients, an excellent indicator for determining when the water quality is changing the most along the course of the Danube, reach their maximum during summer for temperature (t), electric conductivity, nitrates, and total N, while in the same season suspended matter, COD, BOD-5, DO, and oxygen saturation coefficients reach their minimum. Correlations for used data sets of selected parameters were analyzed for better understanding of their behavior and mutual relations. It was observed that as Danube flows through Serbia, its general eco-chemical status either stagnates or improves, but the rate of river self-purification often depends on the season of the year.
PB  - Springer, Dordrecht
T2  - Environmental Monitoring and Assessment
T1  - Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia
VL  - 184
IS  - 5
SP  - 2805
EP  - 2828
DO  - 10.1007/s10661-011-2153-0
ER  - 

@article{
author = "Ilijević, Konstantin and Gržetić, Ivan and Zivadinovic, Ivan and Popović, Aleksandar R.",
year = "2012",
abstract = "Seasonal spatial and temporal changes of selected eco-chemical parameters in section of the Danube River flowing through Serbia were analyzed. Data for electrical conductivity (EC), dry and suspended matter, residue on ignition, chemical oxygen demand (COD), biochemical oxygen demand (BOD-5), ultraviolet extinction, dissolved oxygen (DO), oxygen saturation, pH, nitrates, total phosphorus, and nitrogen were collected between 1992 and 2006. The use of monthly medians combined with linear regression and two-sided t test has been proven to be the best approach for resolving trends from natural variability of investigated parameters and for determining trend significance. Patterns of temporal changes between different months were examined. It was also determined that spatial trends of some parameters oscillate in predictable manner, increasing in one part of the year and declining in the other. Regression slope coefficients, an excellent indicator for determining when the water quality is changing the most along the course of the Danube, reach their maximum during summer for temperature (t), electric conductivity, nitrates, and total N, while in the same season suspended matter, COD, BOD-5, DO, and oxygen saturation coefficients reach their minimum. Correlations for used data sets of selected parameters were analyzed for better understanding of their behavior and mutual relations. It was observed that as Danube flows through Serbia, its general eco-chemical status either stagnates or improves, but the rate of river self-purification often depends on the season of the year.",
publisher = "Springer, Dordrecht",
journal = "Environmental Monitoring and Assessment",
title = "Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia",
volume = "184",
number = "5",
pages = "2805-2828",
doi = "10.1007/s10661-011-2153-0"
}

Ilijević, K., Gržetić, I., Zivadinovic, I.,& Popović, A. R.. (2012). Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia. in Environmental Monitoring and Assessment
Springer, Dordrecht., 184(5), 2805-2828.
https://doi.org/10.1007/s10661-011-2153-0

Ilijević K, Gržetić I, Zivadinovic I, Popović AR. Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia. in Environmental Monitoring and Assessment. 2012;184(5):2805-2828.
doi:10.1007/s10661-011-2153-0 .

Ilijević, Konstantin, Gržetić, Ivan, Zivadinovic, Ivan, Popović, Aleksandar R., "Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia" in Environmental Monitoring and Assessment, 184, no. 5 (2012):2805-2828,
https://doi.org/10.1007/s10661-011-2153-0 . .

TY  - JOUR
AU  - Ilijević, Konstantin
AU  - Gržetić, Ivan
AU  - Zivadinovic, Ivan
AU  - Popović, Aleksandar R.
PY  - 2012
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1288
AB  - Seasonal spatial and temporal changes of selected eco-chemical parameters in section of the Danube River flowing through Serbia were analyzed. Data for electrical conductivity (EC), dry and suspended matter, residue on ignition, chemical oxygen demand (COD), biochemical oxygen demand (BOD-5), ultraviolet extinction, dissolved oxygen (DO), oxygen saturation, pH, nitrates, total phosphorus, and nitrogen were collected between 1992 and 2006. The use of monthly medians combined with linear regression and two-sided t test has been proven to be the best approach for resolving trends from natural variability of investigated parameters and for determining trend significance. Patterns of temporal changes between different months were examined. It was also determined that spatial trends of some parameters oscillate in predictable manner, increasing in one part of the year and declining in the other. Regression slope coefficients, an excellent indicator for determining when the water quality is changing the most along the course of the Danube, reach their maximum during summer for temperature (t), electric conductivity, nitrates, and total N, while in the same season suspended matter, COD, BOD-5, DO, and oxygen saturation coefficients reach their minimum. Correlations for used data sets of selected parameters were analyzed for better understanding of their behavior and mutual relations. It was observed that as Danube flows through Serbia, its general eco-chemical status either stagnates or improves, but the rate of river self-purification often depends on the season of the year.
PB  - Springer, Dordrecht
T2  - Environmental Monitoring and Assessment
T1  - Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia
VL  - 184
IS  - 5
SP  - 2805
EP  - 2828
DO  - 10.1007/s10661-011-2153-0
ER  - 

@article{
author = "Ilijević, Konstantin and Gržetić, Ivan and Zivadinovic, Ivan and Popović, Aleksandar R.",
year = "2012",
abstract = "Seasonal spatial and temporal changes of selected eco-chemical parameters in section of the Danube River flowing through Serbia were analyzed. Data for electrical conductivity (EC), dry and suspended matter, residue on ignition, chemical oxygen demand (COD), biochemical oxygen demand (BOD-5), ultraviolet extinction, dissolved oxygen (DO), oxygen saturation, pH, nitrates, total phosphorus, and nitrogen were collected between 1992 and 2006. The use of monthly medians combined with linear regression and two-sided t test has been proven to be the best approach for resolving trends from natural variability of investigated parameters and for determining trend significance. Patterns of temporal changes between different months were examined. It was also determined that spatial trends of some parameters oscillate in predictable manner, increasing in one part of the year and declining in the other. Regression slope coefficients, an excellent indicator for determining when the water quality is changing the most along the course of the Danube, reach their maximum during summer for temperature (t), electric conductivity, nitrates, and total N, while in the same season suspended matter, COD, BOD-5, DO, and oxygen saturation coefficients reach their minimum. Correlations for used data sets of selected parameters were analyzed for better understanding of their behavior and mutual relations. It was observed that as Danube flows through Serbia, its general eco-chemical status either stagnates or improves, but the rate of river self-purification often depends on the season of the year.",
publisher = "Springer, Dordrecht",
journal = "Environmental Monitoring and Assessment",
title = "Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia",
volume = "184",
number = "5",
pages = "2805-2828",
doi = "10.1007/s10661-011-2153-0"
}

Ilijević, K., Gržetić, I., Zivadinovic, I.,& Popović, A. R.. (2012). Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia. in Environmental Monitoring and Assessment
Springer, Dordrecht., 184(5), 2805-2828.
https://doi.org/10.1007/s10661-011-2153-0

Ilijević K, Gržetić I, Zivadinovic I, Popović AR. Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia. in Environmental Monitoring and Assessment. 2012;184(5):2805-2828.
doi:10.1007/s10661-011-2153-0 .

Ilijević, Konstantin, Gržetić, Ivan, Zivadinovic, Ivan, Popović, Aleksandar R., "Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia" in Environmental Monitoring and Assessment, 184, no. 5 (2012):2805-2828,
https://doi.org/10.1007/s10661-011-2153-0 . .

TY  - JOUR
AU  - Zivadinovic, Ivan
AU  - Ilijević, Konstantin
AU  - Gržetić, Ivan
AU  - Popović, Aleksandar R.
PY  - 2010
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1116
AB  - The Danube River is an international river, one part of which flows through Serbia. The eco-chemical status of the Danube River is a constant topic of interest both at the local level, in each country through which the Danube flows, and at the international level. General interest to ensure the sustainable and equitable use of waters and freshwater resources in the Danube River Basin led to the development of a system for monitoring the river, which has produced data sets of its eco-chemical status. These have been collected over many years in Serbia; however, the present interest was focused only on the period from 1992 until 2006, i.e., a 15-year period. The process of defining trends of selected eco-chemical parameters, using linear regression analysis with a defined level of significance, and their separation from natural variability is of the highest importance for defining the changes in the water parameters. Through them, the fate and behavior of the eco-chemical parameters of the Danube in Serbia can be recognized and the prediction of their trends in the near future can be attempted. The obtained results revealed a constant improvement and acceptable trends of the eco-chemical status of the Danube River, as well as, substantial differences in the quality of the inflowing and out flowing water.
AB  - Dunav je međunarodna reka koja jednim delom prolazi i kroz Srbiju. Ekohemijski status Dunava je tema koja je konstantno u žiži interesovanja kako na lokalnom (unutar država kroz koje Dunav protiče), tako i na međunarodnom nivou. Usled generalnog interesa da se obezbedi i održiva ravnomerna upotreba vode i slatkovodnih resursa u basenu reke Dunav, razvijen je rečni monitoring sistem koji je grupe podataka o ekohemijskom statusu Dunava na prostoru Srbije prikupljao tokom više godina. Ovaj rad je fokusiran na petnaestogodišnji period, od 1992. do 2006. godine. Utvrđivanje postojanja trendova korišćenjem linearne regresije, uz tačno određen nivo značaja vrednosti odabranih ekohemijskih parametara kao i utvrđivanja razlike u odnosu na prirodnu varijabilnost parametara, bilo je od velikog značaja za određivanje promene rečnih parametara. Pomoću njih, pokušano je određivanje sudbine i ponašanja ekohemijskih parametara Dunava na teritoriji Srbije i predviđanje njihove vrednosti u budućnosti. Dobijeni rezultati otkrili su konstantno popravljanje i prihvatljive trendove promena ekohemijskog statusa Dunava kao i primetne razlike kvaliteta vode između ulaza u Srbiju i izlaza Dunava iz Srbije.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Long-term changes in the eco-chemical status of the Danube River in the region of Serbia
T1  - Dugoročne promene ekohemijskog statusa Dunava na teritoriji Srbije
VL  - 75
IS  - 8
SP  - 1125
EP  - 1148
DO  - 10.2298/JSC091102075Z
ER  - 

@article{
author = "Zivadinovic, Ivan and Ilijević, Konstantin and Gržetić, Ivan and Popović, Aleksandar R.",
year = "2010",
abstract = "The Danube River is an international river, one part of which flows through Serbia. The eco-chemical status of the Danube River is a constant topic of interest both at the local level, in each country through which the Danube flows, and at the international level. General interest to ensure the sustainable and equitable use of waters and freshwater resources in the Danube River Basin led to the development of a system for monitoring the river, which has produced data sets of its eco-chemical status. These have been collected over many years in Serbia; however, the present interest was focused only on the period from 1992 until 2006, i.e., a 15-year period. The process of defining trends of selected eco-chemical parameters, using linear regression analysis with a defined level of significance, and their separation from natural variability is of the highest importance for defining the changes in the water parameters. Through them, the fate and behavior of the eco-chemical parameters of the Danube in Serbia can be recognized and the prediction of their trends in the near future can be attempted. The obtained results revealed a constant improvement and acceptable trends of the eco-chemical status of the Danube River, as well as, substantial differences in the quality of the inflowing and out flowing water., Dunav je međunarodna reka koja jednim delom prolazi i kroz Srbiju. Ekohemijski status Dunava je tema koja je konstantno u žiži interesovanja kako na lokalnom (unutar država kroz koje Dunav protiče), tako i na međunarodnom nivou. Usled generalnog interesa da se obezbedi i održiva ravnomerna upotreba vode i slatkovodnih resursa u basenu reke Dunav, razvijen je rečni monitoring sistem koji je grupe podataka o ekohemijskom statusu Dunava na prostoru Srbije prikupljao tokom više godina. Ovaj rad je fokusiran na petnaestogodišnji period, od 1992. do 2006. godine. Utvrđivanje postojanja trendova korišćenjem linearne regresije, uz tačno određen nivo značaja vrednosti odabranih ekohemijskih parametara kao i utvrđivanja razlike u odnosu na prirodnu varijabilnost parametara, bilo je od velikog značaja za određivanje promene rečnih parametara. Pomoću njih, pokušano je određivanje sudbine i ponašanja ekohemijskih parametara Dunava na teritoriji Srbije i predviđanje njihove vrednosti u budućnosti. Dobijeni rezultati otkrili su konstantno popravljanje i prihvatljive trendove promena ekohemijskog statusa Dunava kao i primetne razlike kvaliteta vode između ulaza u Srbiju i izlaza Dunava iz Srbije.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Long-term changes in the eco-chemical status of the Danube River in the region of Serbia, Dugoročne promene ekohemijskog statusa Dunava na teritoriji Srbije",
volume = "75",
number = "8",
pages = "1125-1148",
doi = "10.2298/JSC091102075Z"
}

Zivadinovic, I., Ilijević, K., Gržetić, I.,& Popović, A. R.. (2010). Long-term changes in the eco-chemical status of the Danube River in the region of Serbia. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 75(8), 1125-1148.
https://doi.org/10.2298/JSC091102075Z

Zivadinovic I, Ilijević K, Gržetić I, Popović AR. Long-term changes in the eco-chemical status of the Danube River in the region of Serbia. in Journal of the Serbian Chemical Society. 2010;75(8):1125-1148.
doi:10.2298/JSC091102075Z .

Zivadinovic, Ivan, Ilijević, Konstantin, Gržetić, Ivan, Popović, Aleksandar R., "Long-term changes in the eco-chemical status of the Danube River in the region of Serbia" in Journal of the Serbian Chemical Society, 75, no. 8 (2010):1125-1148,
https://doi.org/10.2298/JSC091102075Z . .