Use of Organic Solvents to Extract Organochlorine Pesticides (OCPs) from Aged Contaminated Soils  

作　　者：YE Mao YANG Xing-Lun SUN Ming-Ming BIAN Yong-Rong WANG Fang GU Cheng-Gang WEI Hai-Jiang SONG Yang WANG Lei JIN Xin JIANG Xin 

机构地区：[1]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences

出　　处：《Pedosphere》2013年第1期10-19,共10页土壤圈（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China (No. 2009AA063103);the National Natural Science Foundation of China (No. 41030531)

摘　　要：Problems associated with organochlorine pesticide （OCP）-contaminated sites in China have received wide attention. To solve such problems, innovative ex-situ methods of site remediation are urgently needed. We investigated the feasibility of the extraction method with different organic solvents, ethanol, 1-propanol, and three fractions of petroleum ether, using a soil collected from Wujiang （W J）, China, a region with long-term contamination of dichlorodiphenyltrichloroethanes （DDTs）. We evaluated different influential factors, including organic solvent concentration, washing time, mixing speed, solutiomto-soil ratio, and washing temperature, on the removal of DDTs from the WJ soil. A set of relatively better parameters were selected for extraction with 100 mL L-1 petroleum ether （60-90 ℃）： washing time of 180 min, mixing speed of 100 r min-I, solution-to-soil ratio of 10：1, and washing temperature of 50 ℃. These selected parameters were also applied on three other seriously OCP-polluted soils. Results demonstrated their broad-spectrum effectiveness and excellent OCP extraction performance on the contaminated soils with different characteristics.Problems associated with organochlorine pesticide (OCP)-contaminated sites in China have received wide attention. To solve such problems, innovative ex-situ methods of site remediation are urgently needed. We investigated the feasibility of the extraction method with different organic solvents, ethanol, 1-propanol, and three fractions of petroleum ether, using a soil collected from Wujiang (WJ), China, a region with long-term contamination of dichlorodiphenyltrichloroethanes (DDTs). We evaluated different influential factors, including organic solvent concentration, washing time, mixing speed, solution-to-soil ratio, and washing temperature, on the removal of DDTs from the WJ soil. A set of relatively better parameters were selected for extraction with 100 mL L 1 petroleum ether (60-90℃): washing time of 180 min, mixing speed of 100 r min 1 , solution-to-soil ratio of 10:1, and washing temperature of 50℃. These selected parameters were also applied on three other seriously OCP-polluted soils. Results demonstrated their broad-spectrum effectiveness and excellent OCP extraction performance on the contaminated soils with different characteristics.

关 键 词：DICHLORODIPHENYLTRICHLOROETHANE ex-situ soil washing extraction performance petroleum ether site remediation 

分 类 号：X53[环境科学与工程—环境工程]