Photodegradation of bensulphuron methyl in aqueous solution
Photodegradation of bensulphuron methyl, (methyl a-(4,6-dimethoxypyrimidin-2-carbamoylsulphamoyl)- o -toluate ester) was carried out in aqueous solution under UV light. The rate of photolysis followed first-order kinetics, with a half-life of 31.7?min at ??=?254?nm and 41.3?h at ??=?290?nm,
with significant correlation coefficients (0.9898 and 0.9625, respectively). The main photoproducts in distilled water were identified with a diode array detector and mass spectrometry. The results indicate that different reaction pathways are followed: cleavage of the sulphonylurea bridge,
desulphonylation, which can proceed either by a carbon–sulphur cleavage or a nitrogen–sulphur cleavage and contraction of the sulphonylurea bridge. A mechanism which accounts for the formation of the photoproducts is proposed
Keywords: Bensulphuron methyl; Degradation products; Photolysis; Sulphonylurea herbicides
Document Type: Research Article
Affiliations: Dipartimento di Chimica Farmaceutica e Tossicologica, Università degli Studi di Napoli Federico II, Via D. Montesano 49, 80131 Naples, Italy
Publication date: 01 March 2006
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