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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.

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Authors and Affiliations

  1. Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences, B.P. 45 Université Chouaïb Doukkali, El Jadida, Morocco

    Salah Rafqah & Ahmed Aamili

  2. Unité de Phytopharmacie médiateurs chimiques, INRA, route de St Cyr, 78026, Versailles Cedex, France

    Sylvie Nelieu, Lucien Kerhoas & Jacques Einhorn

  3. Laboratoire de Photochimie Moléculaire et Macromoléculaire, Université Blaise Pascal, UMR CNRS 6505, F-63177, Aubière Cedex, France

    Gilles Mailhot & Mohamed Sarakha

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  1. Salah Rafqah
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  2. Ahmed Aamili
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  3. Sylvie Nelieu
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  5. Jacques Einhorn
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Dedicated to Dr. Pierre Boule in recognition of his outstanding contribution to the development of photochemistry in aqueous solution.

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Rafqah, S., Aamili, A., Nelieu, S. et al. 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. Photochem Photobiol Sci 3, 296–304 (2004). https://doi.org/10.1039/b314001f

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