TY  - JOUR
AU  - Đurović, Ana
AU  - Stojanović, Zorica
AU  - Kravić, Snežana
AU  - Zeremski, Tijana
AU  - Grahovac, Nada
AU  - Brezo-Borjan, T.Ž.
PY  - 2018
UR  - http://fiver.ifvcns.rs/handle/123456789/1836
AB  - The work presents results of the determination of metribuzin content in commercial pesticide formulations by applying chronopotentiometry with thin film mercury electrode as an electrochemical sensor. In the analyzed pesticide formulations, a single well defined reduction peak of metribuzin is observed at the potential around -880 mV. The content of the herbicide in commercial formulations is determined using the calibration curve method, by applying the initial potential of -0.21 V, and the final potential of -1.10 V. Recovery values based on the declared and found content of the active ingredient are in the range from 100.67% to 101.68%, with the values of relative standard deviation lower than 1.00%, indicating high accuracy and precision of the presented method.
PB  - Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad
T2  - Acta Periodica Technologica
T1  - Determination of metribuzin content in pesticide formulations using electroanalytical methodology
T1  - Određivanje sadržaja metribuzina u formulacijama pesticida primenom elektroanalitičke metodologije
EP  - 51
SP  - 43
VL  - 49
DO  - 10.2298/APT1849043D
ER  - 

@article{
author = "Đurović, Ana and Stojanović, Zorica and Kravić, Snežana and Zeremski, Tijana and Grahovac, Nada and Brezo-Borjan, T.Ž.",
year = "2018",
abstract = "The work presents results of the determination of metribuzin content in commercial pesticide formulations by applying chronopotentiometry with thin film mercury electrode as an electrochemical sensor. In the analyzed pesticide formulations, a single well defined reduction peak of metribuzin is observed at the potential around -880 mV. The content of the herbicide in commercial formulations is determined using the calibration curve method, by applying the initial potential of -0.21 V, and the final potential of -1.10 V. Recovery values based on the declared and found content of the active ingredient are in the range from 100.67% to 101.68%, with the values of relative standard deviation lower than 1.00%, indicating high accuracy and precision of the presented method.",
publisher = "Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad",
journal = "Acta Periodica Technologica",
title = "Determination of metribuzin content in pesticide formulations using electroanalytical methodology, Određivanje sadržaja metribuzina u formulacijama pesticida primenom elektroanalitičke metodologije",
pages = "51-43",
volume = "49",
doi = "10.2298/APT1849043D"
}

Đurović, A., Stojanović, Z., Kravić, S., Zeremski, T., Grahovac, N.,& Brezo-Borjan, T.Ž.. (2018). Determination of metribuzin content in pesticide formulations using electroanalytical methodology. in Acta Periodica Technologica
Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad., 49, 43-51.
https://doi.org/10.2298/APT1849043D

Đurović A, Stojanović Z, Kravić S, Zeremski T, Grahovac N, Brezo-Borjan T. Determination of metribuzin content in pesticide formulations using electroanalytical methodology. in Acta Periodica Technologica. 2018;49:43-51.
doi:10.2298/APT1849043D .

Đurović, Ana, Stojanović, Zorica, Kravić, Snežana, Zeremski, Tijana, Grahovac, Nada, Brezo-Borjan, T.Ž., "Determination of metribuzin content in pesticide formulations using electroanalytical methodology" in Acta Periodica Technologica, 49 (2018):43-51,
https://doi.org/10.2298/APT1849043D . .

TY  - JOUR
AU  - Đurović, Ana
AU  - Stojanović, Zorica
AU  - Kravić, Snežana
AU  - Rakić, Dušan
AU  - Grahovac, Nada
PY  - 2018
UR  - http://fiver.ifvcns.rs/handle/123456789/1792
AB  - In this paper, a chronopotentiometric method for the determination of herbicide metamitron (MTM) using a glassy carbon electrode (GCE) and a thin film mercury electrode (TFME) as working electrodes is presented. MTM provided a well-defined reductive peak in the Britton-Robinson buffer on both working electrodes. Instrumental and chemical factors such as pH of the buffer, initial potential and reduction current influencing MTM chronopotentiometric response were optimised with the Box-Behnken experimental design. Under the optimal combination of factors, the analytical signal was linear in the MTM concentration range of 0.8-30mg/L, with a detection limit of 68.53 mu g/L using a TFME, and in the concentration range of 1-30mg/L, with a detection limit of 92.91 mu g/L using a GCE. The precision of the method was estimated as a function of repeatability and reproducibility, with the value of relative standard deviation lower than 2.6%. The applicability of the method was verified by direct analysis of MTM in spiked water samples and commercial pesticide formulations. The obtained results were in good agreement with those obtained using liquid chromatography/tandem mass spectrometry (LC-MS/MS) method, or with those labelled by the manufacturer. By using chronopotentiometry, neither extraction nor preconcentration procedures are necessary, thus making this method simple, cost-effective and more feasible for analytical routine analysis.
PB  - Taylor & Francis Ltd, Abingdon
T2  - International Journal of Environmental Analytical Chemistry
T1  - Novel electrochemical procedure for the determination of metamitron
EP  - 385
IS  - 4
SP  - 369
VL  - 98
DO  - 10.1080/03067319.2018.1469625
ER  - 

@article{
author = "Đurović, Ana and Stojanović, Zorica and Kravić, Snežana and Rakić, Dušan and Grahovac, Nada",
year = "2018",
abstract = "In this paper, a chronopotentiometric method for the determination of herbicide metamitron (MTM) using a glassy carbon electrode (GCE) and a thin film mercury electrode (TFME) as working electrodes is presented. MTM provided a well-defined reductive peak in the Britton-Robinson buffer on both working electrodes. Instrumental and chemical factors such as pH of the buffer, initial potential and reduction current influencing MTM chronopotentiometric response were optimised with the Box-Behnken experimental design. Under the optimal combination of factors, the analytical signal was linear in the MTM concentration range of 0.8-30mg/L, with a detection limit of 68.53 mu g/L using a TFME, and in the concentration range of 1-30mg/L, with a detection limit of 92.91 mu g/L using a GCE. The precision of the method was estimated as a function of repeatability and reproducibility, with the value of relative standard deviation lower than 2.6%. The applicability of the method was verified by direct analysis of MTM in spiked water samples and commercial pesticide formulations. The obtained results were in good agreement with those obtained using liquid chromatography/tandem mass spectrometry (LC-MS/MS) method, or with those labelled by the manufacturer. By using chronopotentiometry, neither extraction nor preconcentration procedures are necessary, thus making this method simple, cost-effective and more feasible for analytical routine analysis.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "International Journal of Environmental Analytical Chemistry",
title = "Novel electrochemical procedure for the determination of metamitron",
pages = "385-369",
number = "4",
volume = "98",
doi = "10.1080/03067319.2018.1469625"
}

Đurović, A., Stojanović, Z., Kravić, S., Rakić, D.,& Grahovac, N.. (2018). Novel electrochemical procedure for the determination of metamitron. in International Journal of Environmental Analytical Chemistry
Taylor & Francis Ltd, Abingdon., 98(4), 369-385.
https://doi.org/10.1080/03067319.2018.1469625

Đurović A, Stojanović Z, Kravić S, Rakić D, Grahovac N. Novel electrochemical procedure for the determination of metamitron. in International Journal of Environmental Analytical Chemistry. 2018;98(4):369-385.
doi:10.1080/03067319.2018.1469625 .

Đurović, Ana, Stojanović, Zorica, Kravić, Snežana, Rakić, Dušan, Grahovac, Nada, "Novel electrochemical procedure for the determination of metamitron" in International Journal of Environmental Analytical Chemistry, 98, no. 4 (2018):369-385,
https://doi.org/10.1080/03067319.2018.1469625 . .

TY  - JOUR
AU  - Grahovac, Nada
AU  - Stojanović, Zorica
AU  - Kravić, Snežana
AU  - Orčić, Dejan Z.
AU  - Suturović, Zvonimir
AU  - Kondić-Špika, Ankica
AU  - Vasin, Jovica
AU  - Šunjka, Dragana B.
AU  - Jakšić, Snežana
AU  - Rajković, Miloš
AU  - Grahovac, Nenad M.
PY  - 2017
UR  - http://fiver.ifvcns.rs/handle/123456789/1691
AB  - A modified method for the analysis of nicosulfuron, rimsulfuron and prosulfuron was developed and validated by using microwave-assisted extraction (MAE) and ultra-performance liquid chromatography with diode array detection in the ultraviolet region (HPLC-UV-DAD). The most important experimental parameters of extraction procedure and HPLC-UV-DAD technique were optimised in respect to those sulfonylurea herbicides. High recoveries of the microwave-assisted extraction were obtained by using a dichloromethane-acetonitrile mixture (2:1 volume ratio) acidified with acetic acid (0.8 vol.%) with the addition of urea. The mean recoveries at three spiking levels ranged from 97.47 to 98.76% for nicosulfuron, 97.88 to 99.17% for rimsulfuron and from 97.91 to 99.83% for prosulfuron. The limits of detection of nicosulfuron, rimsulfuron and prosulfuron were 0.95, 0.91 and 0.89 mu g kg(-1), respectively. The accuracy of the developed method was confirmed by HPLC coupled with tandem mass spectrometry parallel analyses. The developed method was used to investigate the dissipation dynamics of sulfonylurea herbicides in the real field trials in Vojvodina Province, Serbia. The obtained half-lives were 0.05, 0.23 and 0.15 days for recommended dose application of nicosulfuron, rimsulfuron and prosulfuron, respectively. Low residues and short half-life in soil suggested that the risk to sensitive rotational crops after application of those sulfonylurea herbicides is low when they are used in the appropriate dosages.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Determination of residues of sulfonylurea herbicides in soil by using microwave-assisted extraction and high performance liquid chromatographic method
EP  - 298
IS  - 4
SP  - 289
VL  - 71
DO  - 10.2298/HEMIND160224039G
ER  - 

@article{
author = "Grahovac, Nada and Stojanović, Zorica and Kravić, Snežana and Orčić, Dejan Z. and Suturović, Zvonimir and Kondić-Špika, Ankica and Vasin, Jovica and Šunjka, Dragana B. and Jakšić, Snežana and Rajković, Miloš and Grahovac, Nenad M.",
year = "2017",
abstract = "A modified method for the analysis of nicosulfuron, rimsulfuron and prosulfuron was developed and validated by using microwave-assisted extraction (MAE) and ultra-performance liquid chromatography with diode array detection in the ultraviolet region (HPLC-UV-DAD). The most important experimental parameters of extraction procedure and HPLC-UV-DAD technique were optimised in respect to those sulfonylurea herbicides. High recoveries of the microwave-assisted extraction were obtained by using a dichloromethane-acetonitrile mixture (2:1 volume ratio) acidified with acetic acid (0.8 vol.%) with the addition of urea. The mean recoveries at three spiking levels ranged from 97.47 to 98.76% for nicosulfuron, 97.88 to 99.17% for rimsulfuron and from 97.91 to 99.83% for prosulfuron. The limits of detection of nicosulfuron, rimsulfuron and prosulfuron were 0.95, 0.91 and 0.89 mu g kg(-1), respectively. The accuracy of the developed method was confirmed by HPLC coupled with tandem mass spectrometry parallel analyses. The developed method was used to investigate the dissipation dynamics of sulfonylurea herbicides in the real field trials in Vojvodina Province, Serbia. The obtained half-lives were 0.05, 0.23 and 0.15 days for recommended dose application of nicosulfuron, rimsulfuron and prosulfuron, respectively. Low residues and short half-life in soil suggested that the risk to sensitive rotational crops after application of those sulfonylurea herbicides is low when they are used in the appropriate dosages.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Determination of residues of sulfonylurea herbicides in soil by using microwave-assisted extraction and high performance liquid chromatographic method",
pages = "298-289",
number = "4",
volume = "71",
doi = "10.2298/HEMIND160224039G"
}

Grahovac, N., Stojanović, Z., Kravić, S., Orčić, D. Z., Suturović, Z., Kondić-Špika, A., Vasin, J., Šunjka, D. B., Jakšić, S., Rajković, M.,& Grahovac, N. M.. (2017). Determination of residues of sulfonylurea herbicides in soil by using microwave-assisted extraction and high performance liquid chromatographic method. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 71(4), 289-298.
https://doi.org/10.2298/HEMIND160224039G

Grahovac N, Stojanović Z, Kravić S, Orčić DZ, Suturović Z, Kondić-Špika A, Vasin J, Šunjka DB, Jakšić S, Rajković M, Grahovac NM. Determination of residues of sulfonylurea herbicides in soil by using microwave-assisted extraction and high performance liquid chromatographic method. in Hemijska Industrija. 2017;71(4):289-298.
doi:10.2298/HEMIND160224039G .

Grahovac, Nada, Stojanović, Zorica, Kravić, Snežana, Orčić, Dejan Z., Suturović, Zvonimir, Kondić-Špika, Ankica, Vasin, Jovica, Šunjka, Dragana B., Jakšić, Snežana, Rajković, Miloš, Grahovac, Nenad M., "Determination of residues of sulfonylurea herbicides in soil by using microwave-assisted extraction and high performance liquid chromatographic method" in Hemijska Industrija, 71, no. 4 (2017):289-298,
https://doi.org/10.2298/HEMIND160224039G . .

TY  - JOUR
AU  - Pastor, Kristian
AU  - Ačanski, Marijana
AU  - Vujić, Đura
AU  - Bekavac, Goran
AU  - Milovac, Snezana
AU  - Kravić, Snežana
PY  - 2016
UR  - http://fiver.ifvcns.rs/handle/123456789/1503
AB  - The aim of this study was the application of the gas chromatography-mass spectrometry system (GC/EI-MS) system and multivariate data analysis to investigate the possibility of chemical differentiation between small grain flour (wheat, barley, oat, triticale, rye) and corn flour samples. All cereal flour samples were first defatted with hexane, after which the extraction with ethanol was performed. Extracted simple sugars (monosaccharides, disaccharides, trisaccharides, and sugar alcohols) were analyzed in the form of their corresponding trimethylsilyl oximes. Peaks of simple sugar derivatives were selected in total ion current (TIC) chromatograms by monitoring exclusively the following characteristic abundant ions: 204, 217, and 361 m/z. The total surface areas under the selected peaks were subjected to multivariate analysis. Applying principal coordinate analysis and hierarchical cluster analysis to obtained data, samples of corn flour could be very clearly distinguished from all samples of small grain flour, which presented a weaker separation among each other. This method circumvents common analytical procedures by excluding simple sugar identifications, quantitative analysis, the use of analytical standards, and calibration curves. Results are applicable in the quality assurance of mixed flour on the market, considering the increased popularity of their consumption in human nutrition.
PB  - Springer, New York
T2  - Food Analytical Methods
T1  - Rapid Method for Small Grain and Corn Flour Authentication Using GC/EI-MS and Multivariate Analysis
EP  - 450
IS  - 2
SP  - 443
VL  - 9
DO  - 10.1007/s12161-015-0215-6
ER  - 

@article{
author = "Pastor, Kristian and Ačanski, Marijana and Vujić, Đura and Bekavac, Goran and Milovac, Snezana and Kravić, Snežana",
year = "2016",
abstract = "The aim of this study was the application of the gas chromatography-mass spectrometry system (GC/EI-MS) system and multivariate data analysis to investigate the possibility of chemical differentiation between small grain flour (wheat, barley, oat, triticale, rye) and corn flour samples. All cereal flour samples were first defatted with hexane, after which the extraction with ethanol was performed. Extracted simple sugars (monosaccharides, disaccharides, trisaccharides, and sugar alcohols) were analyzed in the form of their corresponding trimethylsilyl oximes. Peaks of simple sugar derivatives were selected in total ion current (TIC) chromatograms by monitoring exclusively the following characteristic abundant ions: 204, 217, and 361 m/z. The total surface areas under the selected peaks were subjected to multivariate analysis. Applying principal coordinate analysis and hierarchical cluster analysis to obtained data, samples of corn flour could be very clearly distinguished from all samples of small grain flour, which presented a weaker separation among each other. This method circumvents common analytical procedures by excluding simple sugar identifications, quantitative analysis, the use of analytical standards, and calibration curves. Results are applicable in the quality assurance of mixed flour on the market, considering the increased popularity of their consumption in human nutrition.",
publisher = "Springer, New York",
journal = "Food Analytical Methods",
title = "Rapid Method for Small Grain and Corn Flour Authentication Using GC/EI-MS and Multivariate Analysis",
pages = "450-443",
number = "2",
volume = "9",
doi = "10.1007/s12161-015-0215-6"
}

Pastor, K., Ačanski, M., Vujić, Đ., Bekavac, G., Milovac, S.,& Kravić, S.. (2016). Rapid Method for Small Grain and Corn Flour Authentication Using GC/EI-MS and Multivariate Analysis. in Food Analytical Methods
Springer, New York., 9(2), 443-450.
https://doi.org/10.1007/s12161-015-0215-6

Pastor K, Ačanski M, Vujić Đ, Bekavac G, Milovac S, Kravić S. Rapid Method for Small Grain and Corn Flour Authentication Using GC/EI-MS and Multivariate Analysis. in Food Analytical Methods. 2016;9(2):443-450.
doi:10.1007/s12161-015-0215-6 .

Pastor, Kristian, Ačanski, Marijana, Vujić, Đura, Bekavac, Goran, Milovac, Snezana, Kravić, Snežana, "Rapid Method for Small Grain and Corn Flour Authentication Using GC/EI-MS and Multivariate Analysis" in Food Analytical Methods, 9, no. 2 (2016):443-450,
https://doi.org/10.1007/s12161-015-0215-6 . .

TY  - JOUR
AU  - Đurović, Ana
AU  - Stojanović, Zorica
AU  - Kravić, Snežana
AU  - Grahovac, Nada
AU  - Bursić, Vojislava
AU  - Vuković, Gorica
AU  - Suturović, Zvonimir
PY  - 2016
UR  - http://fiver.ifvcns.rs/handle/123456789/1508
AB  - A new electrochemical method for determination of imidacloprid using chronopotentiometry on thin film mercury and glassy carbon electrode was presented. The most important experimental parameters of chronopotentiometry were examined and optimized with respect to imidacloprid analytical signal. Imidacloprid provided well-defined reduction peak in Britton-Robinson buffer on thin film mercury electrode at -1.0V (versus Ag/AgCl (KCl, 3.5 mol/L)) and on glassy carbon electrode at -1.2V (versus Ag/AgCl (KCl, 3.5mol/L)). The reduction time was linearly proportional to concentrations from 0.8 to 30.0 mg/L on thin film mercury electrode and from 7.0 to 70.0mg/L on glassy carbon electrode. The detection limits were 0.17mg/L and 0.93mg/L for thin film mercury and glassy carbon electrode, respectively. The estimation of method precision as a function of repeatability and reproducibility showed relative standard deviations values lower than 3.73%. Recovery values from 97.3 to 98.1% confirmed the accuracy of the proposed method, while the constancy of the transition time with deliberated small changes in the experimental parameters indicated a very good robustness. A minor influence of possible interfering compounds proved good selectivity of the method. Developed method was applied for imidacloprid determination in commercial pesticide formulations and river water samples.
PB  - Hindawi Ltd, London
T2  - International Journal of Analytical Chemistry
T1  - Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples
VL  - 2016
DO  - 10.1155/2016/5138491
ER  - 

@article{
author = "Đurović, Ana and Stojanović, Zorica and Kravić, Snežana and Grahovac, Nada and Bursić, Vojislava and Vuković, Gorica and Suturović, Zvonimir",
year = "2016",
abstract = "A new electrochemical method for determination of imidacloprid using chronopotentiometry on thin film mercury and glassy carbon electrode was presented. The most important experimental parameters of chronopotentiometry were examined and optimized with respect to imidacloprid analytical signal. Imidacloprid provided well-defined reduction peak in Britton-Robinson buffer on thin film mercury electrode at -1.0V (versus Ag/AgCl (KCl, 3.5 mol/L)) and on glassy carbon electrode at -1.2V (versus Ag/AgCl (KCl, 3.5mol/L)). The reduction time was linearly proportional to concentrations from 0.8 to 30.0 mg/L on thin film mercury electrode and from 7.0 to 70.0mg/L on glassy carbon electrode. The detection limits were 0.17mg/L and 0.93mg/L for thin film mercury and glassy carbon electrode, respectively. The estimation of method precision as a function of repeatability and reproducibility showed relative standard deviations values lower than 3.73%. Recovery values from 97.3 to 98.1% confirmed the accuracy of the proposed method, while the constancy of the transition time with deliberated small changes in the experimental parameters indicated a very good robustness. A minor influence of possible interfering compounds proved good selectivity of the method. Developed method was applied for imidacloprid determination in commercial pesticide formulations and river water samples.",
publisher = "Hindawi Ltd, London",
journal = "International Journal of Analytical Chemistry",
title = "Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples",
volume = "2016",
doi = "10.1155/2016/5138491"
}

Đurović, A., Stojanović, Z., Kravić, S., Grahovac, N., Bursić, V., Vuković, G.,& Suturović, Z.. (2016). Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples. in International Journal of Analytical Chemistry
Hindawi Ltd, London., 2016.
https://doi.org/10.1155/2016/5138491

Đurović A, Stojanović Z, Kravić S, Grahovac N, Bursić V, Vuković G, Suturović Z. Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples. in International Journal of Analytical Chemistry. 2016;2016.
doi:10.1155/2016/5138491 .

Đurović, Ana, Stojanović, Zorica, Kravić, Snežana, Grahovac, Nada, Bursić, Vojislava, Vuković, Gorica, Suturović, Zvonimir, "Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples" in International Journal of Analytical Chemistry, 2016 (2016),
https://doi.org/10.1155/2016/5138491 . .

TY  - JOUR
AU  - Stojanović, Zorica
AU  - Đurović, Ana
AU  - Kravić, Snežana
AU  - Grahovac, Nada
AU  - Suturović, Zvonimir
AU  - Bursić, Vojislava
AU  - Vuković, Gorica
AU  - Brezo, Tanja
PY  - 2016
UR  - http://fiver.ifvcns.rs/handle/123456789/1553
AB  - This paper describes an electroanalytical method for the determination of metribuzin using a thin film mercury electrode by chronopotentiometry. Research included optimization of the most important parameters of chronopotentiometric analysis and the best responses were achieved in Britton-Robinson buffer at pH 5.0, using an initial potential of -0.21 V, ending potential of -1.1 V, and reduction current in the range from -4 mu A to -15 mA. Under these conditions, metribuzin was reduced in an irreversible electrode reaction process with one well-defined reduction wave at -0.83 V (vs. Ag/AgCl, KCl, 3.5 mol dm(-3)). A linear response was observed for three concentration ranges 1-5, 5-15 and 15-30 mg dm(-3), with an achieved limit of detection of 0.042 mg dm(-3). The precision was determined as a function of repeatability and reproducibility, which showed relative standard deviation values not higher than 3.18%. Various interfering substances did not interfere with metribuzin determination. The proposed method was successfully applied to tap and river water samples. The recovery values obtained for spiked river water samples were in good statistical agreement with those obtained by the LC-MS/MS method. Accordingly, the proposed chronopotentiometric methodology can be conveniently applied in the quality control of environmental water samples as a simple, sensitive, reliable and low cost method.
PB  - Royal Soc Chemistry, Cambridge
T2  - Analytical Methods
T1  - A simple and rapid electrochemical sensing method for metribuzin determination in tap and river water samples
EP  - 2705
IS  - 12
SP  - 2698
VL  - 8
DO  - 10.1039/c5ay03243a
ER  - 

@article{
author = "Stojanović, Zorica and Đurović, Ana and Kravić, Snežana and Grahovac, Nada and Suturović, Zvonimir and Bursić, Vojislava and Vuković, Gorica and Brezo, Tanja",
year = "2016",
abstract = "This paper describes an electroanalytical method for the determination of metribuzin using a thin film mercury electrode by chronopotentiometry. Research included optimization of the most important parameters of chronopotentiometric analysis and the best responses were achieved in Britton-Robinson buffer at pH 5.0, using an initial potential of -0.21 V, ending potential of -1.1 V, and reduction current in the range from -4 mu A to -15 mA. Under these conditions, metribuzin was reduced in an irreversible electrode reaction process with one well-defined reduction wave at -0.83 V (vs. Ag/AgCl, KCl, 3.5 mol dm(-3)). A linear response was observed for three concentration ranges 1-5, 5-15 and 15-30 mg dm(-3), with an achieved limit of detection of 0.042 mg dm(-3). The precision was determined as a function of repeatability and reproducibility, which showed relative standard deviation values not higher than 3.18%. Various interfering substances did not interfere with metribuzin determination. The proposed method was successfully applied to tap and river water samples. The recovery values obtained for spiked river water samples were in good statistical agreement with those obtained by the LC-MS/MS method. Accordingly, the proposed chronopotentiometric methodology can be conveniently applied in the quality control of environmental water samples as a simple, sensitive, reliable and low cost method.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Analytical Methods",
title = "A simple and rapid electrochemical sensing method for metribuzin determination in tap and river water samples",
pages = "2705-2698",
number = "12",
volume = "8",
doi = "10.1039/c5ay03243a"
}

Stojanović, Z., Đurović, A., Kravić, S., Grahovac, N., Suturović, Z., Bursić, V., Vuković, G.,& Brezo, T.. (2016). A simple and rapid electrochemical sensing method for metribuzin determination in tap and river water samples. in Analytical Methods
Royal Soc Chemistry, Cambridge., 8(12), 2698-2705.
https://doi.org/10.1039/c5ay03243a

Stojanović Z, Đurović A, Kravić S, Grahovac N, Suturović Z, Bursić V, Vuković G, Brezo T. A simple and rapid electrochemical sensing method for metribuzin determination in tap and river water samples. in Analytical Methods. 2016;8(12):2698-2705.
doi:10.1039/c5ay03243a .

Stojanović, Zorica, Đurović, Ana, Kravić, Snežana, Grahovac, Nada, Suturović, Zvonimir, Bursić, Vojislava, Vuković, Gorica, Brezo, Tanja, "A simple and rapid electrochemical sensing method for metribuzin determination in tap and river water samples" in Analytical Methods, 8, no. 12 (2016):2698-2705,
https://doi.org/10.1039/c5ay03243a . .

TY  - JOUR
AU  - Stojanović, Zorica
AU  - Švarc-Gajić, Jaroslava V.
AU  - Đorđević, Marika Z.
AU  - Grahovac, Nada
AU  - Vasin, Jovica
AU  - Đurović, Ana
AU  - Kravić, Snežana
PY  - 2015
UR  - http://fiver.ifvcns.rs/handle/123456789/1400
AB  - The study deals with mineral characterisation of natural waters from South-East Serbia. The contents of aluminium, arsenic, calcium, cadmium, cobalt, chromium, cooper, iron, potassium, magnesium, manganese, sodium, nickel, lead and zinc were analysed in spring, ground and river waters by inductively coupled plasma-atomic emission spectrometry (ICPAES) technique. The study area was in the Southern Serbia, and included slopes of Rtanj, Ozren, Bukovik, Vrdenik and Čemernik mountains, and the valley of South Morava. Obtained contents were compared with Serbian regulations on the quality of water for human use, and directive of World Health Organization (WHO) for maximum allowed concentrations of chemical substances. High contents of macro-elements, namely calcium, magnesium and potassium, were detected in several spring and ground water samples which are believed to be due to direct influence of rock minerals. Some water samples contained iron, manganese and copper in concentration up to 168.3, 8.10 and 14.9 μg dm-3, respectively, but within the permissible limits. Other heavy metals were not detected in analysed samples. Based on the derived results, tested ground and spring water samples have significant potential to be used as sources for the production of bottled water, but further investigations are necessary. Additional investigations have to be focused on complete physical, chemical and microbiological assessments of water resources. Systematic hydrogeological assessment also should be performed in all seasons. In the meantime, precautionary measures should be immediately taken to protect and preserve these water resources.
AB  - Ovaj rad predstavlja analizu kvaliteta prirodnih voda iz jugoistočne Srbije. Sadržaj arsena, aluminijuma, kalcijuma, kadmijuma, kobalta, hroma, bakra, gvožđa, kalijuma, magnezijuma, mangana, natrijuma, nikla, olova i cinka je određivan u izvorskim i podzemnim vodama, kao i u rečnoj vodi. Analiza navedenih elemenata je izvedena ICP-AES tehnikom. Analizirani su uzorci voda iz oblasti jugoistočne Srbije, uključujući područja planine Rtnja, Ozrena, Bukovika, Vrdenika i Čemernika, kao i područje doline reke Južne Morave. Određeni sadržaji analiziranih elemenata su poređeni sa važećim pravilnicima Republike Srbije i preporukama Svetske zdravstvene organizacije (SZO). Visoki sadržaj makro-elemenata, odnosno kalcijuma, magnezijuma i kalijuma uočeni su u izvorskim i nekoliko uzoraka podzemnih voda, što može biti posledica direktnog uticaja magmatskih stena. Pojedini uzorci voda su sadržali nešto više sadržaje gvožđa, mangana i bakra u koncentraciji do 168,3, 8,10 i 14,9 μg dm-3, redom, ali u granicama propisanim Pravilnikom i u skladu da preporukama SZO. Ostali teški metali nisu detektovani u ispitivanim uzorcima. Na osnovu dobijenih rezultata se može zaključiti da testirani uzorci podzemnih i izvorskih voda imaju značajan potencijal u smislu proizvodnje flaširane vode, uz neophodna dodatna istraživanja. Dodatna istraživanja bi trebalo usmeriti na kompletnu hemijsku analizu i ispitivanje fizičkih i mikrobioloških karakteristika uzoraka voda. Pored toga, neophodno je sprovesti sistematsko hidrogeološko ispitivanje izdašnosti podzemnih i izvorskih voda tokom svih godišnjih doba. U međuvremenu treba preduzeti mere predostrožnosti kako bi se ovi vodeni resursi zaštitili i očuvali.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Study on the quality of ground, spring and river waters in South-East Serbia
T1  - Ispitivanje kvaliteta podzemnih, izvorskih i rečnih voda sa područja jugoistočne Srbije
EP  - 192
IS  - 2
SP  - 185
VL  - 69
DO  - 10.2298/HEMIND131115033S
ER  - 

@article{
author = "Stojanović, Zorica and Švarc-Gajić, Jaroslava V. and Đorđević, Marika Z. and Grahovac, Nada and Vasin, Jovica and Đurović, Ana and Kravić, Snežana",
year = "2015",
abstract = "The study deals with mineral characterisation of natural waters from South-East Serbia. The contents of aluminium, arsenic, calcium, cadmium, cobalt, chromium, cooper, iron, potassium, magnesium, manganese, sodium, nickel, lead and zinc were analysed in spring, ground and river waters by inductively coupled plasma-atomic emission spectrometry (ICPAES) technique. The study area was in the Southern Serbia, and included slopes of Rtanj, Ozren, Bukovik, Vrdenik and Čemernik mountains, and the valley of South Morava. Obtained contents were compared with Serbian regulations on the quality of water for human use, and directive of World Health Organization (WHO) for maximum allowed concentrations of chemical substances. High contents of macro-elements, namely calcium, magnesium and potassium, were detected in several spring and ground water samples which are believed to be due to direct influence of rock minerals. Some water samples contained iron, manganese and copper in concentration up to 168.3, 8.10 and 14.9 μg dm-3, respectively, but within the permissible limits. Other heavy metals were not detected in analysed samples. Based on the derived results, tested ground and spring water samples have significant potential to be used as sources for the production of bottled water, but further investigations are necessary. Additional investigations have to be focused on complete physical, chemical and microbiological assessments of water resources. Systematic hydrogeological assessment also should be performed in all seasons. In the meantime, precautionary measures should be immediately taken to protect and preserve these water resources., Ovaj rad predstavlja analizu kvaliteta prirodnih voda iz jugoistočne Srbije. Sadržaj arsena, aluminijuma, kalcijuma, kadmijuma, kobalta, hroma, bakra, gvožđa, kalijuma, magnezijuma, mangana, natrijuma, nikla, olova i cinka je određivan u izvorskim i podzemnim vodama, kao i u rečnoj vodi. Analiza navedenih elemenata je izvedena ICP-AES tehnikom. Analizirani su uzorci voda iz oblasti jugoistočne Srbije, uključujući područja planine Rtnja, Ozrena, Bukovika, Vrdenika i Čemernika, kao i područje doline reke Južne Morave. Određeni sadržaji analiziranih elemenata su poređeni sa važećim pravilnicima Republike Srbije i preporukama Svetske zdravstvene organizacije (SZO). Visoki sadržaj makro-elemenata, odnosno kalcijuma, magnezijuma i kalijuma uočeni su u izvorskim i nekoliko uzoraka podzemnih voda, što može biti posledica direktnog uticaja magmatskih stena. Pojedini uzorci voda su sadržali nešto više sadržaje gvožđa, mangana i bakra u koncentraciji do 168,3, 8,10 i 14,9 μg dm-3, redom, ali u granicama propisanim Pravilnikom i u skladu da preporukama SZO. Ostali teški metali nisu detektovani u ispitivanim uzorcima. Na osnovu dobijenih rezultata se može zaključiti da testirani uzorci podzemnih i izvorskih voda imaju značajan potencijal u smislu proizvodnje flaširane vode, uz neophodna dodatna istraživanja. Dodatna istraživanja bi trebalo usmeriti na kompletnu hemijsku analizu i ispitivanje fizičkih i mikrobioloških karakteristika uzoraka voda. Pored toga, neophodno je sprovesti sistematsko hidrogeološko ispitivanje izdašnosti podzemnih i izvorskih voda tokom svih godišnjih doba. U međuvremenu treba preduzeti mere predostrožnosti kako bi se ovi vodeni resursi zaštitili i očuvali.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Study on the quality of ground, spring and river waters in South-East Serbia, Ispitivanje kvaliteta podzemnih, izvorskih i rečnih voda sa područja jugoistočne Srbije",
pages = "192-185",
number = "2",
volume = "69",
doi = "10.2298/HEMIND131115033S"
}

Stojanović, Z., Švarc-Gajić, J. V., Đorđević, M. Z., Grahovac, N., Vasin, J., Đurović, A.,& Kravić, S.. (2015). Study on the quality of ground, spring and river waters in South-East Serbia. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 69(2), 185-192.
https://doi.org/10.2298/HEMIND131115033S

Stojanović Z, Švarc-Gajić JV, Đorđević MZ, Grahovac N, Vasin J, Đurović A, Kravić S. Study on the quality of ground, spring and river waters in South-East Serbia. in Hemijska Industrija. 2015;69(2):185-192.
doi:10.2298/HEMIND131115033S .

Stojanović, Zorica, Švarc-Gajić, Jaroslava V., Đorđević, Marika Z., Grahovac, Nada, Vasin, Jovica, Đurović, Ana, Kravić, Snežana, "Study on the quality of ground, spring and river waters in South-East Serbia" in Hemijska Industrija, 69, no. 2 (2015):185-192,
https://doi.org/10.2298/HEMIND131115033S . .

TY  - JOUR
AU  - Đurović, Ana
AU  - Stojanović, Zorica
AU  - Kravić, Snežana
AU  - Suturović, Zvonimir
AU  - Brezo, Tanja
AU  - Grahovac, Nada
AU  - Milanović, Spasenija D.
PY  - 2015
UR  - http://fiver.ifvcns.rs/handle/123456789/1496
AB  - This study compares different methods for the removal of oxygen from the solution prior to the chronopotentiometric determination of the insecticide imidacloprid on glassy carbon electrode. The research included the application of the chemical method involving addition of sulfite ion, and the physical method of purging the sample with nitrogen stream, as well as their combination. By comparing analytical signals of imidacloprid, chemical method showed almost the same efficiency as conventional physical method, while the best reproducibility was achieved by applying chemical method with addition of the saturated sodium sulfite solution. The method is very simple and can be applied for deoxygenation of the solution prior to the chronopotentiometric analysis. The application of the chemical deoxygenation significantly shortened duration of the chronopotentiometric analysis of imidacloprid from approximately 15 min to 1 min.
AB  - U ovoj studiji poređene su različite metode za uklanjanje rastvorenog kiseonika iz rastvora pre hronopotenciometrijskog određivanja insekticida imidakloprida na elektrodi od staklastog ugljenika. Istraživanje je obuhvatalo primenu hemijske metode dodatkom sulfitnog jona i fizičke metode provođenje struje azota kroz uzorak u trajanju od 5, 10 i 15 min, kao i njihovu kombinaciju. Poređenjem analitičkih signala imidakloprida, hemijska metoda pokazala je skoro istu efikasnost kao i konvencionalna fizička metoda, dok je najbolja reproduktivnost ostvarena primenom hemijske metode uz dodatak 0,8 cm3 zasićenog rastvora natrijum sulfita. Metoda je veoma jednostavna i može se primeniti za uklanjanje kiseonika iz rastvora pre izvođenja hronopotenciometrijske analize. Primenom hemijske deoksigenacije značajno se skraćuje trajanje hronopotenciometrijske analize imidakloprida sa 15 min na 1 min.
PB  - Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad
T2  - Acta Periodica Technologica
T1  - A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid
T1  - Poređenje različitih metoda za uklanjanje rastvorenog kiseonika - primena pri elektrohemijskom određivanju imidakloprida
EP  - 155
SP  - 149
VL  - 46
DO  - 10.2298/APT1546149D
ER  - 

@article{
author = "Đurović, Ana and Stojanović, Zorica and Kravić, Snežana and Suturović, Zvonimir and Brezo, Tanja and Grahovac, Nada and Milanović, Spasenija D.",
year = "2015",
abstract = "This study compares different methods for the removal of oxygen from the solution prior to the chronopotentiometric determination of the insecticide imidacloprid on glassy carbon electrode. The research included the application of the chemical method involving addition of sulfite ion, and the physical method of purging the sample with nitrogen stream, as well as their combination. By comparing analytical signals of imidacloprid, chemical method showed almost the same efficiency as conventional physical method, while the best reproducibility was achieved by applying chemical method with addition of the saturated sodium sulfite solution. The method is very simple and can be applied for deoxygenation of the solution prior to the chronopotentiometric analysis. The application of the chemical deoxygenation significantly shortened duration of the chronopotentiometric analysis of imidacloprid from approximately 15 min to 1 min., U ovoj studiji poređene su različite metode za uklanjanje rastvorenog kiseonika iz rastvora pre hronopotenciometrijskog određivanja insekticida imidakloprida na elektrodi od staklastog ugljenika. Istraživanje je obuhvatalo primenu hemijske metode dodatkom sulfitnog jona i fizičke metode provođenje struje azota kroz uzorak u trajanju od 5, 10 i 15 min, kao i njihovu kombinaciju. Poređenjem analitičkih signala imidakloprida, hemijska metoda pokazala je skoro istu efikasnost kao i konvencionalna fizička metoda, dok je najbolja reproduktivnost ostvarena primenom hemijske metode uz dodatak 0,8 cm3 zasićenog rastvora natrijum sulfita. Metoda je veoma jednostavna i može se primeniti za uklanjanje kiseonika iz rastvora pre izvođenja hronopotenciometrijske analize. Primenom hemijske deoksigenacije značajno se skraćuje trajanje hronopotenciometrijske analize imidakloprida sa 15 min na 1 min.",
publisher = "Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad",
journal = "Acta Periodica Technologica",
title = "A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid, Poređenje različitih metoda za uklanjanje rastvorenog kiseonika - primena pri elektrohemijskom određivanju imidakloprida",
pages = "155-149",
volume = "46",
doi = "10.2298/APT1546149D"
}

Đurović, A., Stojanović, Z., Kravić, S., Suturović, Z., Brezo, T., Grahovac, N.,& Milanović, S. D.. (2015). A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid. in Acta Periodica Technologica
Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad., 46, 149-155.
https://doi.org/10.2298/APT1546149D

Đurović A, Stojanović Z, Kravić S, Suturović Z, Brezo T, Grahovac N, Milanović SD. A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid. in Acta Periodica Technologica. 2015;46:149-155.
doi:10.2298/APT1546149D .

Đurović, Ana, Stojanović, Zorica, Kravić, Snežana, Suturović, Zvonimir, Brezo, Tanja, Grahovac, Nada, Milanović, Spasenija D., "A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid" in Acta Periodica Technologica, 46 (2015):149-155,
https://doi.org/10.2298/APT1546149D . .