title: Phototransformation of metoxuron [3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea] in aqueous solution.
abstract: UV irradiation of metoxuron in aerated aqueous solution at 254 nm or between 300 and 450 nm led initially to an almost specific photohydrolysis of the C-Cl bond, resulting in the formation of 3-(3-hydroxy-4-methoxyphenyl)-1,1-dimethylurea (MX3) and hydrogen chloride. The quantum yield was determined to be 0.020 (+/- 0.005) in solutions irradiated at 254 nm. Five minor photoproducts were also identified, in particular the dihydroxydimethoxybiphenyl derivatives resulting from the phototransformation of MX3. Irradiation increased the toxicity of an aqueous solution of metoxuron to the marine bacterium Vibrio fischeri.
authors.affiliation: Laboratoire des Sciences et Technologies de l'Environnement, Université Mentouri, Route de Ain El Bey, 25000 Constantine, Algeria.
authors.forename: A
authors.initials: A
authors.lastname: Boulkamh
authors.forename: D
authors.initials: D
authors.lastname: Harakat
authors.forename: T
authors.initials: T
authors.lastname: Sehili
authors.forename: P
authors.initials: P
authors.lastname: Boule
mesh_terms: D006540:Herbicides / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity; D006868:Hydrolysis / Q000528:radiation effects; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008782:Methylurea Compounds / Q000378:metabolism* / Q000633:toxicity; D015394:Molecular Structure; D010573:Pesticide Residues / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity; D010671:Phenylurea Compounds / Q000737:chemistry / Q000378:metabolism* / Q000633:toxicity; D010782:Photolysis / Q000528:radiation effects*; D018675:Toxicity Tests; D014466:Ultraviolet Rays; D014733:Vibrio / Q000187:drug effects; D014867:Water / Q000008:administration & dosage
chemical_list: D006540:Herbicides; D008782:Methylurea Compounds; D010573:Pesticide Residues; D010671:Phenylurea Compounds; D014867:Water; C007033:chlortoluron; C454323:3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea