Study of photodegradation of the pesticide Ethiofencarb in aqueous and non-aqueous media, by gas chromatography- mass spectrometry
- Sanz-Asensio, J. 1
- Plaza-Medina, M. 1
- Martínez-Soria, M.T. 1
- Pérez-Clavijo, M. 1
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1
Universidad de La Rioja
info
ISSN: 0021-9673
Datum der Publikation: 1999
Ausgabe: 840
Nummer: 2
Seiten: 235-247
Art: Artikel
Andere Publikationen in: Journal of Chromatography A
Zusammenfassung
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. Copyright (C) 1999 Elsevier Science B.V.