Study of photodegradation of the pesticide Ethiofencarb in aqueous and non-aqueous media, by gas chromatography- mass spectrometry

  1. Sanz-Asensio, J. 1
  2. Plaza-Medina, M. 1
  3. Martínez-Soria, M.T. 1
  4. Pérez-Clavijo, M. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Journal of Chromatography A

ISSN: 0021-9673

Año de publicación: 1999

Volumen: 840

Número: 2

Páginas: 235-247

Tipo: Artículo

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DOI: 10.1016/S0021-9673(99)00219-8 SCOPUS: 2-s2.0-0032898270 WoS: WOS:000080162500009 GOOGLE SCHOLAR

Otras publicaciones en: Journal of Chromatography A

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Resumen

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.