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Issue 3, 2004
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Kinetics and mechanism of the degradation of the pesticide metsulfuron methyl induced by excitation of iron(III) aqua complexes in aqueous solutions: steady state and transient absorption spectroscopy studies

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Abstract

The degradation of the pesticide metsulfuron methyl induced by excitation of iron(III) aqua complexes was studied at 365 nm. The process involved the formation of hydroxyl radicals and was shown to depend on Fe(OH)2+ concentration. The second order rate constant of the reaction of metsulfuron methyl and hydroxyl radical was evaluated by laser flash photolysis experiments to k =  3.5 × 109 mol−1 L s−1. Various products were formed. Among them 2-amino-4-methoxy-6-methyl-1,3,5-triazine, 2-(carbomethoxy) benzenesulfonamide and hydroxylated derivatives represent the major photoproducts. Compounds arising from the cleavage of the triazine moiety were also found. After prolonged irradiation, a total disappearance of metsulfuron methyl and a complete mineralization of the solution were obtained.

Graphical abstract: Kinetics and mechanism of the degradation of the pesticide metsulfuron methyl induced by excitation of iron(iii) aqua complexes in aqueous solutions: steady state and transient absorption spectroscopy studies

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Publication details

The article was received on 05 Nov 2003, accepted on 13 Jan 2004 and first published on 10 Feb 2004


Article type: Paper
DOI: 10.1039/B314001F
Citation: Photochem. Photobiol. Sci., 2004,3, 296-304
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    Kinetics and mechanism of the degradation of the pesticide metsulfuron methyl induced by excitation of iron(III) aqua complexes in aqueous solutions: steady state and transient absorption spectroscopy studies

    S. Rafqah, A. Aamili, S. Nelieu, L. Kerhoas, J. Einhorn, G. Mailhot and M. Sarakha, Photochem. Photobiol. Sci., 2004, 3, 296
    DOI: 10.1039/B314001F

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