유기염소계 살충제 endosulfan과 이의 토양 중 주 분해산물인 endosulfan sulfate의 ZVI에 의한 분해정도와 분해산물을 조사하였다. ZVI처리에 의해서 수용액내에서 endosulfan과 endosulfan sulfate는 pH가 낮을수록 분해율이 높았으며 pH 3.0에서 ${alpha}$-endosulfan은 28%, endosulfan sulfate는 90%정도 분해되었고 acetone/water(50/50, v/v) 용액에서는 ${alpha}$-endosulfan은 65%, endosulfan sulfate는 92%정도 분해되었다. ZVI에 의해 ${alpha}$-endosulfan 및 endosulfan sulfate는 분해되어 2개의 미확인 물질을 생성하였다. 반응시간에 따른 반응속도와 반감기를 비교해 보면 endosulfan sulfate가 ${alpha}$-endosulfan에 비해 빠르게 분해되는 양상을 보였다. ZVI의 처리에 인해 ${alpha}$-endosulfan과 endosulfan sulfate에서 생성된 2개의 미확인 물질은 GC-MS로 분석한 결과, 하나의 $Cl^-$가 $H^+$로 치환된 구조이성질체로 나타났다.
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.
