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  - 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  - 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 . .