TY  - CONF
AU  - Lazić, S.
AU  - Grahovac, Nada
AU  - Šunjka, D.
AU  - Guzsvány, V.
AU  - Jakšić, Snežana
PY  - 2013
UR  - http://fiver.ifvcns.rs/handle/123456789/3700
AB  - Chlorinated acids are selective agricultural herbicides which are widely employed in agriculture and gardening for control the growth of different unwanted
vegetable species in crops. Because of high water solubility and toxicological risk
of some acid herbicides and their metabolic products, monitoring of their concentration in surface and groundwater is very important task. The acidic herbicides
are manufactured in formulation as free acids, as their alkaline salts or as esters.
The unionized free acids vary in water solubility (Table 1), but the acidic herbicides most frequently exist in ionized form at environmental pH values. Acidic
herbicides formulated as salts are water soluble, while those formulations prepared as esters are less water soluble. In the environment, acidic herbicides formulated as esters have short hydrolysis half-life time (24-48 h) and therefore they are
generally present as ionized acids. For most analytes, especially for the acidic herbicides, solid phase extraction (SPE) is the choice of sample treatment, which is
followed by appropriate chromatographic separation and sensitive determination
of target components. For the acidic herbicides, combination of physico-chemical
parameters influences their extraction from aqueous solution. Ionogenicity (pKa)
and hydrophobicity (logkow) are especially important in determining the approach of SPE for efficient sample clean-up for further chromatographic analysis
of chlorophenoxy acid herbicide in water samples.
C3  - Knjiga izvoda, 6. Simpozijum „Hemija i zaštita životne sredine EnviroChem 2013“,  Vršac
T1  - Solid-phase extraction followed by high-performance liquid chromatography with diode array detection for screening of dicamba herbicide in water
EP  - 387
SP  - 386
UR  - https://hdl.handle.net/21.15107/rcub_fiver_3700
ER  - 

@conference{
author = "Lazić, S. and Grahovac, Nada and Šunjka, D. and Guzsvány, V. and Jakšić, Snežana",
year = "2013",
abstract = "Chlorinated acids are selective agricultural herbicides which are widely employed in agriculture and gardening for control the growth of different unwanted
vegetable species in crops. Because of high water solubility and toxicological risk
of some acid herbicides and their metabolic products, monitoring of their concentration in surface and groundwater is very important task. The acidic herbicides
are manufactured in formulation as free acids, as their alkaline salts or as esters.
The unionized free acids vary in water solubility (Table 1), but the acidic herbicides most frequently exist in ionized form at environmental pH values. Acidic
herbicides formulated as salts are water soluble, while those formulations prepared as esters are less water soluble. In the environment, acidic herbicides formulated as esters have short hydrolysis half-life time (24-48 h) and therefore they are
generally present as ionized acids. For most analytes, especially for the acidic herbicides, solid phase extraction (SPE) is the choice of sample treatment, which is
followed by appropriate chromatographic separation and sensitive determination
of target components. For the acidic herbicides, combination of physico-chemical
parameters influences their extraction from aqueous solution. Ionogenicity (pKa)
and hydrophobicity (logkow) are especially important in determining the approach of SPE for efficient sample clean-up for further chromatographic analysis
of chlorophenoxy acid herbicide in water samples.",
journal = "Knjiga izvoda, 6. Simpozijum „Hemija i zaštita životne sredine EnviroChem 2013“,  Vršac",
title = "Solid-phase extraction followed by high-performance liquid chromatography with diode array detection for screening of dicamba herbicide in water",
pages = "387-386",
url = "https://hdl.handle.net/21.15107/rcub_fiver_3700"
}

Lazić, S., Grahovac, N., Šunjka, D., Guzsvány, V.,& Jakšić, S.. (2013). Solid-phase extraction followed by high-performance liquid chromatography with diode array detection for screening of dicamba herbicide in water. in Knjiga izvoda, 6. Simpozijum „Hemija i zaštita životne sredine EnviroChem 2013“,  Vršac, 386-387.
https://hdl.handle.net/21.15107/rcub_fiver_3700

Lazić S, Grahovac N, Šunjka D, Guzsvány V, Jakšić S. Solid-phase extraction followed by high-performance liquid chromatography with diode array detection for screening of dicamba herbicide in water. in Knjiga izvoda, 6. Simpozijum „Hemija i zaštita životne sredine EnviroChem 2013“,  Vršac. 2013;:386-387.
https://hdl.handle.net/21.15107/rcub_fiver_3700 .

Lazić, S., Grahovac, Nada, Šunjka, D., Guzsvány, V., Jakšić, Snežana, "Solid-phase extraction followed by high-performance liquid chromatography with diode array detection for screening of dicamba herbicide in water" in Knjiga izvoda, 6. Simpozijum „Hemija i zaštita životne sredine EnviroChem 2013“,  Vršac (2013):386-387,
https://hdl.handle.net/21.15107/rcub_fiver_3700 .

TY  - CONF
AU  - Lazić, S.
AU  - Šunjka, D.
AU  - Grahovac, Nada
AU  - Guzsvány, V.
PY  - 2013
UR  - http://fiver.ifvcns.rs/handle/123456789/3732
AB  - The characteristics of water used in a spray mix influence the
effectiveness of pesticides. It is important to know the pH of water used
with a pesticide and the susceptibility of the pesticide to hydrolysis.
In order to investigate the persistence, dissipation and degradation
kinetics of bentazone and dicamba, laboratory study was conducted
in deionized water (pH 7.0) at 2542°C (T1) and 442°C (T2). Herbicides
were dissolved at rate of 0.05 mg/ml. Concentration of analytes was
monitoried 0 (1h), 2, 4, 7, 10, 14, 18, 24 and 28 days after treatment and
analysing as triplicate samples. Samples were analyzed by high pressure
liquid chromatography (HPLC/DAD). The chromatographic separation
was carried out with Zorbax Eclipse XDB-C,, (50 mm x 4.6 mm x 1.8 pm)
analytical column, using reverse phase column with gradient conditions
of mobile phase consist of water (with 0.05% H PO,) and acetonitrile. In
T1 the dissipation were 1.3, 5.1, 7.5, 7.9, 8.1, 15.3, 24.1, 26.9% for dicamba
and 11.5, 33.3, 44.6, 46.9,48.8, 49.6, 50.1, 51.8% for bentazone in 2, 4, 7,
10, 14, 18, 24, and 28 days. Corresponding dissipation in T2 experiment
were 2.0, 2.7, 3.9, 5.0, 6.1, 6.9, 6.8, 8.0% for dicamba and 7.7, 15.2, 26.7;
29.4, 30.3, 30.6, 31.4, 31.9% for bentazone, respectively. The dissipation
data in water showed the DT, and DT,, values 57.3 and 114.9 days
ae for dicamba and 17.1 and 125.9 days for bentazone herbicide. Several
simulation models were used to evaluate the experimental data, such
as Exponential and Mittag-Leffler function. The dissipation of analized
eo . herbicides residues over the time in water were described by the MittagLeffler function, with the best-fit model for dicamba and bentazone [1].
The dissipation of dicamba and bentazone residues on 25+2°C and 442°C
es over the time in deinoized water were described by function a*Eo, (-bt).
ag Coefficients a, b, a, 8 were obtained from the experimental data by using
be fitting procedure. We got for dicamba and bentazone herbicides on
a 25+2°C coefficients a=0.8, R=3.71,a=159.11,b=12.79 and a=2.17, B=4.56,
Es a=1387.45, b=1.96 for 442 °C a=0.8, B=4.11, a=82.53, b=7.0 and a=0.99,
rs G=3.15, a=205.81, b=0.117, respectively. The hydrolysis study indicated 
that the dicamba and bentazone pesticides hydrolysed faster at 25+2°C.
These findings can be useful in the prediction of the dissipation behavior
of this pesticides in the spray tank immediately before application. The
dissipation rates of dicamba and bentazone pesticides depended on the
temperature and pH of water to be used.
C3  - 14th European Meeting on Enviromental Chemistry, Budva, Montenegro
T1  - Persistence and dissipation behavior of dicamba and bentazon herbicides in water under laboratory conditions
EP  - 86
SP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_fiver_3732
ER  - 

@conference{
author = "Lazić, S. and Šunjka, D. and Grahovac, Nada and Guzsvány, V.",
year = "2013",
abstract = "The characteristics of water used in a spray mix influence the
effectiveness of pesticides. It is important to know the pH of water used
with a pesticide and the susceptibility of the pesticide to hydrolysis.
In order to investigate the persistence, dissipation and degradation
kinetics of bentazone and dicamba, laboratory study was conducted
in deionized water (pH 7.0) at 2542°C (T1) and 442°C (T2). Herbicides
were dissolved at rate of 0.05 mg/ml. Concentration of analytes was
monitoried 0 (1h), 2, 4, 7, 10, 14, 18, 24 and 28 days after treatment and
analysing as triplicate samples. Samples were analyzed by high pressure
liquid chromatography (HPLC/DAD). The chromatographic separation
was carried out with Zorbax Eclipse XDB-C,, (50 mm x 4.6 mm x 1.8 pm)
analytical column, using reverse phase column with gradient conditions
of mobile phase consist of water (with 0.05% H PO,) and acetonitrile. In
T1 the dissipation were 1.3, 5.1, 7.5, 7.9, 8.1, 15.3, 24.1, 26.9% for dicamba
and 11.5, 33.3, 44.6, 46.9,48.8, 49.6, 50.1, 51.8% for bentazone in 2, 4, 7,
10, 14, 18, 24, and 28 days. Corresponding dissipation in T2 experiment
were 2.0, 2.7, 3.9, 5.0, 6.1, 6.9, 6.8, 8.0% for dicamba and 7.7, 15.2, 26.7;
29.4, 30.3, 30.6, 31.4, 31.9% for bentazone, respectively. The dissipation
data in water showed the DT, and DT,, values 57.3 and 114.9 days
ae for dicamba and 17.1 and 125.9 days for bentazone herbicide. Several
simulation models were used to evaluate the experimental data, such
as Exponential and Mittag-Leffler function. The dissipation of analized
eo . herbicides residues over the time in water were described by the MittagLeffler function, with the best-fit model for dicamba and bentazone [1].
The dissipation of dicamba and bentazone residues on 25+2°C and 442°C
es over the time in deinoized water were described by function a*Eo, (-bt).
ag Coefficients a, b, a, 8 were obtained from the experimental data by using
be fitting procedure. We got for dicamba and bentazone herbicides on
a 25+2°C coefficients a=0.8, R=3.71,a=159.11,b=12.79 and a=2.17, B=4.56,
Es a=1387.45, b=1.96 for 442 °C a=0.8, B=4.11, a=82.53, b=7.0 and a=0.99,
rs G=3.15, a=205.81, b=0.117, respectively. The hydrolysis study indicated 
that the dicamba and bentazone pesticides hydrolysed faster at 25+2°C.
These findings can be useful in the prediction of the dissipation behavior
of this pesticides in the spray tank immediately before application. The
dissipation rates of dicamba and bentazone pesticides depended on the
temperature and pH of water to be used.",
journal = "14th European Meeting on Enviromental Chemistry, Budva, Montenegro",
title = "Persistence and dissipation behavior of dicamba and bentazon herbicides in water under laboratory conditions",
pages = "86-86",
url = "https://hdl.handle.net/21.15107/rcub_fiver_3732"
}

Lazić, S., Šunjka, D., Grahovac, N.,& Guzsvány, V.. (2013). Persistence and dissipation behavior of dicamba and bentazon herbicides in water under laboratory conditions. in 14th European Meeting on Enviromental Chemistry, Budva, Montenegro, 86-86.
https://hdl.handle.net/21.15107/rcub_fiver_3732

Lazić S, Šunjka D, Grahovac N, Guzsvány V. Persistence and dissipation behavior of dicamba and bentazon herbicides in water under laboratory conditions. in 14th European Meeting on Enviromental Chemistry, Budva, Montenegro. 2013;:86-86.
https://hdl.handle.net/21.15107/rcub_fiver_3732 .

Lazić, S., Šunjka, D., Grahovac, Nada, Guzsvány, V., "Persistence and dissipation behavior of dicamba and bentazon herbicides in water under laboratory conditions" in 14th European Meeting on Enviromental Chemistry, Budva, Montenegro (2013):86-86,
https://hdl.handle.net/21.15107/rcub_fiver_3732 .