title: Phototransformation of herbicide metsulfuron methyl.
abstract: Phototransformation of the herbicide metsulfuron methyl was investigated on glass surface under sunlight and ultraviolet (UV) light and compared with dark condition. The half-lives of metsulfuron methyl under UV light and sunlight were found to be 0.5 and 7.8 days respectively. Rate of phototransformation followed first order kinetics with significant correlation coefficient. The major photoproducts were identified as methyl-2-sulfonyl-amino-benzoate, 2-amino-6-methoxy-4-methyltriazine and saccharin (O-sulfobenzoimide). Various metabolites from this study were identified by high performance liquid chromatography (HPLC). Authentic samples required for HPLC comparison were prepared in laboratory and characterized on the basis of nuclear magnetic resonance (NMR) and infra red (IR) spectral data. These metabolites were also identified from metsulfuron methyl treated wheat field soil.
authors.affiliation: Division of Agricultural Chemicals, Indian Agricultural Research Institute (IARI), New Delhi, India.
authors.forename: Rupak
authors.initials: R
authors.lastname: Paul
authors.forename: Shashi B
authors.initials: SB
authors.lastname: Singh
mesh_terms: D000383:Agriculture; D001190:Arylsulfonates / Q000032:analysis / Q000378:metabolism; D001673:Biodegradation, Environmental; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D006540:Herbicides / Q000032:analysis / Q000378:metabolism; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D010782:Photolysis; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism; D013055:Spectrophotometry, Infrared; D013472:Sunlight; D014908:Triticum; D014466:Ultraviolet Rays
chemical_list: D001190:Arylsulfonates; D006540:Herbicides; D012989:Soil Pollutants; C050296:metsulfuron methyl