Dechlorination of DDT and DDE by Dithionite in Dicofol Type DDTs-Contaminated Soil  

作　　者：Peng Bao Zheng-Yi Hu Min Qiao Yu-Xin Ba Chun-Yan WU Chun-You Zhu Jing Hua Jian-ZhiWu 

机构地区：[1]College of Resources and Environment, Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China [2]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China [3]Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, P. R.China

出　　处：《Journal of Chemistry and Chemical Engineering》2011年第10期917-928,共12页化学与化工（英文版）

基　　金：Acknowledgments This research was jointly supported by National Science Foundation of China （No. 20777092）, the ministry of Science and Technology of China （2007CB407304） and Natural science foundation of Zhejiang province of China （Y307025）.

摘　　要：Dicofol type DDTs-contamination is of great concern as environmental organochlorine pollutant. In the present study, dechlorination time-course ofp,p＇-DDT and p,p＇-DDE in dithionite treated waterlogged DDTs-contaminated soil, non-contaminated soil solution and citrate-bicarbonate buffer （0, 50, 100 mmol L^-1, dithionite） for 72 hrs was investigated based on residual amount of p,p＇-DDTs （p,p＇-DDT and p,p＇-DDE） analyzed by GC-ECD. The metabolites ofp,p＇-DDTs in dithionite treated non-contaminated soil solution, and citrate-bicarbonate buffer were detected by GC-MSD. The dechlorination time-course of p,p＇-DDT and p,p＇-DDE exhibited rapid dechlorination at the first 3.0 hrs, slow dechlorination after 3.0 hrs. For 50 mmol L^-1 dithionite treatments, the dechlorination ratios ofp,p＇-DDT and p,p＇-DDE were 36.42% and 35.08% respectively at 3.0 hrs. For 100 mmol L^-1 dithionite treatments, the dechlorination ratios of p,p＇-DDT and p,p＇-DDE were 58.62% and 57.39% respectively at 3.0 hrs in DDTs-contaminated soils. Significant differences of dechlorination ratio were also confirmed in dependence on dithionite concentrations, reaction systems and the chemical structure of DDTs. The dechlorination ratio ofp,p＇-DDT/DDE increased with the increasing of dithionite concentrations irrespective of reaction systems. Dithionite-induced dechlorination ratio of p,p＇-DDT was higher than that of p,p＇-DDE. The p,p＇-DDD （1,1-dichloro-2,2-bis（4-chlorophenyl）-ethane）, p,p＇-DDE and p,p＇-DDMU （1-chloro-2,2-bis（4-chloropheny）-ethylene） were identified to be metabolites ofp,p＇-DDT in buffer and non-contaminated soil solution, however, no metabolites ofp,p＇-DDE treated by dithionite were detected. The possible pathways explaining the dechlorination of p,p＇-DDT and p,p＇-DDE by dithionite were also proposed. Dithionite could be used to develop an effective and fast remediation option for DDTs-contaminated soils and sediments.

关 键 词：Reductive dechlorination DITHIONITE dicofol type DDTs-contamination soil 

分 类 号：TS745[轻工技术与工程—制浆造纸工程] TS272.7[农业科学—茶叶生产加工]