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Iron(III) photo-induced degradation of isoproturon: correlation between degradation and toxicity

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The degradation of isoproturon photoinduced by Fe(III) was investigated under both artificial and solar light. The monomeric species Fe(OH)2+ present under the experimental conditions ([Fe(III)] = 3 × 10-4 M) is the main Fe(III) species responsible for the degradation of isoproturon. The process involves the attack on the pollutant by ·OH radicals generated by irradiation of Fe(OH)2+. The major primary photoproducts were identified; they accumulate in the solution medium before being degraded. The toxicity of the solution to marine bacterium Vibrio fisheri (Beijerinck) Lehmann & Neumann was monitored during the degradation process. It increased in the early stages of the reaction and, among the photoproducts, the N-formyl derivative appeared to be the major product responsible for the increase in toxicity.

© 2002 Society of Chemical Industry

Keywords: hydroxyl radicals; iron(III); isoproturon; photodegradation; toxicity

Document Type: Research Article


Affiliations: 1: * 2: Laboratoire de Biologie Comparée des Protistes UMR 6023 CNRS, Université Blaise Pascal, F-63177 Aubière cedex France

Publication date: July 1, 2002

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