Photodegradation of bensulphuron methyl, (methyl -(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 λ = 254 nm and 41.3 h at λ ≥ 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

Photodegradation of bensulphuron methyl in aqueous solution / Fidente, Paola; Carpentiero, Carmen; Morrica, Patrizia; Seccia, Serenella. - In: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY. - ISSN 0306-7319. - ELETTRONICO. - 86:(2006), pp. 277-287. [10.1080/03067310500246613]

Photodegradation of bensulphuron methyl in aqueous solution

FIDENTE, PAOLA;CARPENTIERO, CARMEN;MORRICA, PATRIZIA;SECCIA, SERENELLA
2006

Abstract

Photodegradation of bensulphuron methyl, (methyl -(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 λ = 254 nm and 41.3 h at λ ≥ 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
2006
Photodegradation of bensulphuron methyl in aqueous solution / Fidente, Paola; Carpentiero, Carmen; Morrica, Patrizia; Seccia, Serenella. - In: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY. - ISSN 0306-7319. - ELETTRONICO. - 86:(2006), pp. 277-287. [10.1080/03067310500246613]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/343250
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