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Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes

Photodegradation of Oryzalin in aqueous isopropanol and acetonitrile.


PMID 26852632

Abstract

The phototransformation of Oryzalin was studied under UV light (λmax ≥ 290xa0nm) and sunlight (λmax ≥ 250xa0nm) 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.