Degradation of organophosphorus and carbamate pesticides in soils—HPLC determination

Thapar, Sangita; Bhushan, Ravi; Mathur, R. K.

doi:10.1002/bmc.1130090104

Cited by 26 publications

(11 citation statements)

References 23 publications

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“…Cymoxanil exhibits several possible modes of action which include the inhibition of nucleic acid synthesis, mycelial respiration, membrane permeability and reduction sporulation. Generally, the lifetime of pesticides is mostly governed by biotic degradation (Shelton and Parkin, 1991;Gennari et al, 1994;Thapar et al, 1995;Brown et al, 1997;Sims and Cupples, 1999). However, hydrolysis (Ramesh and Balasubramanian, 1999;Beltran et al, 2000;Sarmah and Sabadie, 2002) and photolysis (Burrows et al, 2002;Morrica et al, 2004a) are potentially important processes responsible for the removal of the pesticides.…”

Section: Introductionmentioning

confidence: 98%

High-performance liquid chromatographic mass spectrometric identiﬁcation of the photoproducts of cymoxanil

Morrica

Fidente

Seccia

2005

Biomed. Chromatogr.

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The photochemical degradation of the fungicide cymoxanil {2-cyano-N-[(ethylamino)carbonyl]-2-(methoxyimino) acetamide} was studied in aqueous buffer solution (pH 5.9+/- 0.1) under UV light and in laboratory conditions. The degradation followed a pseudo- first-order kinetic with significant correlation coefficient. The main photoproducts were separated and tentatively identified by HPLC/UV and HPLC/MS data, as 3-ethyl-4-(methoxyamino)-2,5-dioxo-4-imidazolidinecarbonitrile, 1-ethyl-5-(methoxyimino)-2,4-imidazolidin-2,4-dione, ethylimidazolidinetrione and {[(ethylamino)carbonyl]-amino}oxoacetic acid. A photolysis pathway of cymoxanil is proposed.

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Section: Introductionmentioning

confidence: 98%

High-performance liquid chromatographic mass spectrometric identiﬁcation of the photoproducts of cymoxanil

Morrica

Fidente

Seccia

2005

Biomed. Chromatogr.

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“…The screening method using HPLC coupled with UV detection has been extensively used to monitor the degradation of pesticides in soils (Anderson and Dulka, 1985;Shneiders et al, 1993;Thapar et al, 1995;Benoit et al, 1999) EXPERIMENTAL PROCEDURE Chemicals and soils. Imazosulfuron (Fig.…”

Section: Introductionmentioning

confidence: 99%

Degradation of imazosulfuron in different soils—HPLC determination

Morrica¹,

Fidente²,

Seccia³

et al. 2002

Biomedical Chromatography

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Imazosulfuron, 1-(2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)urea, is a new sulfonylurea herbicide applied once per growing season. It is highly active at low application levels and is used to control most annual and perennial broad-leaf weeds and some grasses in cereal crop. In this work the degradation of imazosulfuron in four different soils was investigated under aerobic laboratory conditions to evaluate its environmental fate. Test soils were treated with this herbicide in acetonitrile to obtain a final concentration of 0.2 mg kg(-1) (100 g ha(-1)), extracted with methylene chloride and analyzed by reversed-phase liquid chromatography (RP-HPLC) using a C(18) column coupled with UV detection. Recoveries of spiked soils ranged from 84.3 to 99.8% (RDS 0.0-4.9%; n = 4). The limits of quantitation ranged from 0.002 to 0.004 mg kg(-1). Imazosulfuron half-life, t(1/2), was calculated in each of the investigated soil. In aerobic conditions it ranged between 1 and 50 days.

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“…This was followed by degradation of the pesticide. The dissipation process appeared to be slower than in soils (Thapar et al, 1995) because of the static nature of the environment for these experiments, the greater microbial and organic load in soils as compared with sediment and the more congenial environment for decay. As indicated by the later stages of the decay curves degradation was more rapid in sediment than in water (day 5 onwards).…”

Section: Accumulation Of Pesticides In Tropical Fresh Waters 145mentioning

confidence: 83%