Iron(III) photo-induced degradation of isoproturon: correlation between degradation and toxicity.
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 x 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.
Galichet
Frédéric
F
Laboratoire de Photochimie Moléculaire et Macromoléculaire UMR 6505 CNRS, Université Blaise Pascal, F-63177 Aubière, France.
Mailhot
Gilles
G
Bonnemoy
Frédérique
F
Bohatier
Jacques
J
Bolte
Michèle
M
D005290:Ferric Compounds / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry* / Q000528:radiation effects / Q000633:toxicity*; D008027:Light; D008782:Methylurea Compounds / Q000737:chemistry* / Q000528:radiation effects / Q000633:toxicity*; D015394:Molecular Structure; D010472:Perchlorates / Q000737:chemistry*; D010671:Phenylurea Compounds; D010782:Photolysis / Q000528:radiation effects*; D012996:Solutions; D013472:Sunlight; D014733:Vibrio / Q000187:drug effects; D014874:Water Pollutants, Chemical / Q000528:radiation effects / Q000633:toxicity
D005290:Ferric Compounds; D006540:Herbicides; D008782:Methylurea Compounds; D010472:Perchlorates; D010671:Phenylurea Compounds; D012996:Solutions; D014874:Water Pollutants, Chemical; C001473:iron perchlorate; C028904:isoproturon