Photodecomposition of Sumithion® [O,O-Dimethyl-O-(3-methyl-4-nitrophenyl)-phosphorothioate]

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Abstract
When Sumithion solutions in various solvents in air or deposits on silica gel chromatoplates were irradiated with UV light or sunlight, the following products were obtained; carboxysumithion, sumioxon, carboxysumioxon, 3-methyl-4-nitrophenol, 3-carboxy-4-nitrophenol and methyl parathion (solutions). A trace amount of sumithion S-isomer was found in aqueous methanol solution irradiated with UV light in nitrogen and water solution exposed to sunlight. The same photoproducts in almost same proportions were formed on both chromatoplates and leaf surfaces of bean plants. Two major products, carboxysumithion and sumioxon, and 3-methyl-4-nitrophenol were further degraded into more polar products, and finally into polymeric hurnic acids. Certain of carbamate and pyrethroid insecticides slightly accelerated the photodecomposition of Sumithion.

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