Photodegradation of fenarimol

Sur, N.; Pal, S.; Banerjee, Hemanta; Adityachaudhury, N.; Bhattacharyya, Anjan

doi:10.1002/(sici)1526-4998(200003)56:3<289::aid-ps119>3.0.co;2-f

Cited by 27 publications

(20 citation statements)

References 5 publications

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“…The photometabolite M 2 may be derived from M 6 by the above similar hydrolytic cleavage process. Homolytic cleavage of the bonds between quaternary carbon and pyrimidine ring give the free radical species which subsequently react with the hydroxyl radical, [19] which corroborates the present findings. Photometabolite M 7 was formed by the dealkylation of one of the -OCH 3 gr.…”

Section: Mediumsupporting

confidence: 90%

Photolysis of the herbicide bispyribac sodium in aqueous medium under the influence of UV and sunlight in presence or absence of sensitizers

Kanrar¹,

Bhattacharyya²

2009

Journal of Environmental Science and Health, Part B

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The photolysis of a rice herbicide Bispyribac sodium (Sodium 2, 6-bis [(4, 6-dimethoxypyrimidin-2-yl) oxy] benzoate) has been studied in different aqueous medium (distilled water, pond water and Irrigation water) under the influence of UV (lambda max > or = 250 nm) and sunlight in presence or absence of sensitizers (TiO(2) and KNO(3)). The study was conducted under laboratory simulated condition which made it possible to evaluate the contribution of different factors viz. source of irradiation, solvent and sensitizers towards the photolysis of bispyribac sodium. The photodegradation proceeds via first order reaction Kinetics in all the cases. Five photo metabolites (M(1)-M(5)) were isolated in pure form by column chromatographic method from the irradiation system under UV influenced and TiO(2) as sensitizer. From the different spectral data (IR, NMR, UV-VIS, Mass) the structure of these five metabolites were assigned as M(1) (Phenol), M(2) [2, 6-Dihydroxy benzoic acid], M(3) [2, 6-bis [(4, 6 dimethoxypyrimidin-2yl) oxy] benzoic acid], M(4) [2-(3-Hydroxy-phenoxy)-pyrimidine-4, 6-diol] and M(5) as [2,4-Dihydroxy-3, 5-dimethoxy-6-(4-methoxy pyrimidine-2-yloxy)-benzoic acid]. Moreover, another six photometabolites (M(6)-M(11)) were identified from the different irradiation system on the basis of Micromass analysis. On the basis of MS/MS data analysis, the structure of these six photometabolites were assigned as M(6) [2-(4, 6-Dimethoxy-pyrimidin-2-yloxy)-6-hydroxy-benzoic acid], M(7) [2-Hydroxy-6-(4-hydroxy-6-methoxy-pyrimidin-2-yloxy)-benzoic acid], M(8) [4, 6-Dimethoxy-pyrimidin-2-ol], M(9) [6-Methoxy-pyrimidine-2, 4-diol], M(10) [2-Hydroxy-6-(pyrimidin-2-yloxy)-benzoic acid] and M(11) [2, 4, 6-Trimethoxy-pyrimidine]. The plausible Photodegradation pathways of bispyribac sodium in the present investigation were portrayed which proceeds via hydrolysis, hydrolytic cleavage, O-dealkylation, decarboxylation, dehydroxylation, O-alkylation and hydroxylation.

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Section: Mediumsupporting

confidence: 90%

Photolysis of the herbicide bispyribac sodium in aqueous medium under the influence of UV and sunlight in presence or absence of sensitizers

Kanrar¹,

Bhattacharyya²

2009

Journal of Environmental Science and Health, Part B

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“…However, it is necessary to detect residues and the persistence of pesticides in crops to calculate the decrease in pesticide concentrations under specific conditions. Notably, the half‐lives and decay constants of pesticides vary from crop to crop with substantial effects attributed to climatic and environmental conditions (Sur et al ., ; Hem et al ., )…”

Section: Introductionmentioning

confidence: 99%

A combination of solid‐phase extraction and dispersive solid‐phase extraction effectively reduces the matrix interference in liquid chromatography–ultraviolet detection during pyraclostrobin analysis in perilla leaves

Farha

Rahman

El‐Aty

et al. 2015

Biomedical Chromatography

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Perilla leaves contain many interfering substances; thus, it is difficult to protect the analytes during identification and integration. Furthermore, increasing the amount of sample to lower the detection limit worsens the situation. To overcome this problem, we established a new method using a combination of solid-phase extraction and dispersive solid-phase extraction to analyze pyraclostrobin in perilla leaves by liquid chromatography with ultraviolet absorbance detection. The target compound was quantitated by external calibration with a good determination coefficient (R(2) = 0.997). The method was validated (in triplicate) with three fortification levels, and 79.06- 89.10% of the target compound was recovered with a relative standard deviation <4. The limits of detection and quantification were 0.0033 and 0.01 mg/kg, respectively. The method was successfully applied to field samples collected from two different areas at Gwangju and Muan. The decline in the resiudue concentrations was best ascribed to a first-order kinetic model with half-lives of 5.7 and 4.6 days. The variation between the patterns was attributed to humidity.

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“…To understand pesticide behaviour, study of the dissipation pattern of a pesticide is essential (Ramezani & Shahriari, ). The decline pattern of pesticides depends on many factors, including chemical and photo‐chemical degradation, cultivated species, pesticide formulation class, climatic conditions, volatilization and application mode (Kabir et al, ; Papadopoulos, Kotopoulon, Papadopoulos, & Hatziphanis, ; Sur, Pal, Banerjee, Dityachaudhury, & Bhattacharyya, ). The decline pattern of a specific pesticide is valid only under specific conditions for reported crops (Hem et al, ).…”

Section: Introductionmentioning

confidence: 99%

Chromatographic determination, decline dynamic and risk assessment of sulfoxaflor in Asian pear and oriental melon

Kabir

El‐Aty

Rahman

et al. 2017

Biomedical Chromatography

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The dissipation pattern of sulfoxaflor in Asian pear cultivated in an open field conditions and in oriental melon grown under plastic house conditions was each studied in two different locations. Residues in field-treated samples were determined using liquid chromatography coupled with an ultraviolet detector and confirmed by liquid chromatography-tandem mass spectrometry. A calibration curve for sulfoxaflor was linear over the concentration range 0.1-5.0 mg/L, with a coefficient of determination of 0.9999. The limits of detection and quantification (LOQ) were 0.007 and 0.02 mg/kg, respectively. Recoveries at three fortification levels (LOQ, 10 × LOQ and maximum residue limit) ranged from 70.5 to 86.2%, with a relative standard deviation ≤5.8%. The dissipation half-lives were 10.8 and 7.9 days in pear and 5.4 and 5.9 days in oriental melon, at sites 1 and 2, respectively. Based on a pre-harvest residue limit curve, it was predicted that, if the residues at 10 days before harvest in Asian pear are <0.54/0.61 mg/kg and those in oriental melon are <1.43/1.26 mg/kg, then the residue level will be below the maximum residue limit at harvest. Risk assessment at zero days showed a percentage acceptable daily intake of 10.80% in Asian pear and 1.77 and 1.55% in oriental melon, for sites 1 and 2, respectively. These values indicate that the fruits are safe for consumption.

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Photodegradation of fenarimol

Cited by 27 publications

References 5 publications

Photolysis of the herbicide bispyribac sodium in aqueous medium under the influence of UV and sunlight in presence or absence of sensitizers

Photolysis of the herbicide bispyribac sodium in aqueous medium under the influence of UV and sunlight in presence or absence of sensitizers

A combination of solid‐phase extraction and dispersive solid‐phase extraction effectively reduces the matrix interference in liquid chromatography–ultraviolet detection during pyraclostrobin analysis in perilla leaves

Chromatographic determination, decline dynamic and risk assessment of sulfoxaflor in Asian pear and oriental melon

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