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 invest...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.展开更多
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)
文摘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.
