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The dechlorination of endosulfan (6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4,3-benzodioxathiepine-3-oxide) and its metabolite, endosulfan sulfate via reaction with zerovalent iron under various pH conditions was studied using aqueous solution. The reaction products, which were probably produced from endosulfan and endosulfan sulfate by ZVI were identified by GC-MS. The lower the pH of reaction solution, the higher the transformation rate of endosulfan and endosulfan sulfate. The transformation rates of endosulfan and endosulfan sulfate in pH 3.0 by ZVI were 28% and 90% but those of endosulfan and endosulfan sulfate in mixture solution of water/acetone were 65% and 92%, respectively. The pH of reaction solution after ZVI treatment was increased to pH 10. Endosulfan was hydrolyzed at pH 10 but endosulfan sulfate was not hydrolyzed. Two unknown peaks were produced from endosulfan sulfate by treatment of ZVI. As a result of GC-MS analysis, unknown peaks were guessed to be structural isomer substituted hydrogen for chlorine.

Dechlorination of Organochlorine Insecticide, Endosulfan by Zerovalent Iron