title: Photodegradation of Oryzalin in aqueous isopropanol and acetonitrile.
abstract: The phototransformation of Oryzalin was studied under UV light (λmax ≥ 290 nm) and sunlight (λmax ≥ 250 nm) in aqueous isopropanol and acetonitrile solution in absence and presence of TiO2 as sensitizer. The rate of photodegradation of Oryzalin in different solvent system followed first-order kinetics, and calculated half-lives were found to be in the range of 23.52-53.75 h for UV light and 41.23-61.43 h for sunlight. From this study, total 12 photoproducts were identified and characterized on the basis of column chromatography and Q-Tof micromass spectral data. The plausible mechanism of phototransformation involved was hydrolysis, breaking of sulfonic bond, and loss of amino and sulfonic acid group.
authors: a Pesticide Residue Laboratory, Department of Agricultural Chemicals , Bidhan Chandra Krishi Viswavidyalaya , Nadia , West Bengal , India.|b Department of Chemistry , University of Kalyani , Kalyani, Nadia , West Bengal , India.|c Chemical Laboratory, Raghunathpur Thermal Power Station (Phase-I; 2×600 MW), Damodar Valley Corporation , Raghunathpur, Purulia , West Bengal , India.
authors: Sukhendu Kumar
authors: SK
authors: Pramanik
authors: a Pesticide Residue Laboratory, Department of Agricultural Chemicals , Bidhan Chandra Krishi Viswavidyalaya , Nadia , West Bengal , India.
authors: Soumen
authors: S
authors: Joarder
authors: b Department of Chemistry , University of Kalyani , Kalyani, Nadia , West Bengal , India.
authors: Saktipada
authors: S
authors: Das
authors: a Pesticide Residue Laboratory, Department of Agricultural Chemicals , Bidhan Chandra Krishi Viswavidyalaya , Nadia , West Bengal , India.
authors: Sankhajit
authors: S
authors: Roy
authors: a Pesticide Residue Laboratory, Department of Agricultural Chemicals , Bidhan Chandra Krishi Viswavidyalaya , Nadia , West Bengal , India.
authors: Anjan
authors: A
authors: Bhattacharyya
mesh_terms: D019840:2-Propanol / Q000737:chemistry*; D000097:Acetonitriles / Q000737:chemistry*; D004136:Dinitrobenzenes / Q000737:chemistry*; D006207:Half-Life; D007700:Kinetics; D010782:Photolysis; D013424:Sulfanilamides / Q000737:chemistry*; D013472:Sunlight; D014466:Ultraviolet Rays
chemical_list: D000097:Acetonitriles; D004136:Dinitrobenzenes; D013424:Sulfanilamides; C012465:oryzalin; D019840:2-Propanol; C032159:acetonitrile
keywords: Oryzalin; UV light; acetonitrile; isopropanol; photoproduct; sunlight; titanium dioxide