抄録
The photodecomposition of O-ethyl S, S-diphenyl phosphorodithiolate (edifenphos) under laboratory ultraviolet light was investigated by using the 35S-labeled compound. Under catalysis by ultraviolet light, edifenphos was hydrolyzed to O-ethyl S-phenyl hydrogen phosphorothiolate, S-phenyl dihydrogen phosphorothiolate, ethyl dihydrogen phosphate and finally phosphoric acid. The main step of the photodecomposition was cleavage of the P-S bond at the initial stage of irradiation. On irradiation in film and aqueous solution, phenylthio radicals attributed to the cleavage of the P-S linkage were immediately oxidized to form benzensulfonic acid and sulfuric acid. In hexane solution, some phenylthio radicals reacted to give diphenyl disulfide, diphenyl sulfide, 1-methylpentyl benzenesulfinate and 1-methylpentyl benzenesulfonate.
