J. Sanz-Asensio, M. Plaza-Medina, M. Martínez-Soria
Apr 30, 1999
Citations
0
Influential Citations
27
Citations
Journal
Journal of Chromatography A
Abstract
A comparative photodegradation kinetic study of ethiofencarb [2-ethylthiomethyl(phenyl)-N-methylcarbamate] in aqueous and non-aqueous media (hexane and methanol), is carried out. After irradiation, the aqueous samples are extracted with isobutyl methyl ketone. Ethiofencarb and its metabolites are analyzed by GC in combination with nitrogen–phosphorus detection and MS, respectively. The degradation kinetics depend on the solvent polarity; the quickest pesticide transformation is in the aqueous medium and the slowest in hexane. The photoproducts are also dependent on the solvents. In the case of the aqueous solution, photocleavage of the carbon–sulphur bond gives 2-(methyl)phenyl-N-methylcarbamate as the main product, while methanol and hexane solutions show different photoproducts.