Pedosphere 23(1): 10--19, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Use of organic solvents to extract organochlorine pesticides (OCPs) from aged contaminated soils |
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 and JIANG Xin |
| State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China) |
| ABSTRACT |
| 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 oC): washing time of 180 min, mixing speed of 100 r min-1, solution-to-soil ratio of 10:1, and washing temperature of 50 oC. 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. |
| Key Words: dichlorodiphenyltrichloroethane, ex-situ soil washing, extraction performance, petroleum ether, site remediation |
| Citation: Ye, M., Yang, X. L., Sun, M. M., Bian, Y. R., Wang, F., Gu, C. G., Wei, H. J., Song, Y., Wang, L., Jin, X. and Jiang, X. 2013. Use of organic solvents to extract organochlorine pesticides (OCPs) from aged contaminated soils. Pedosphere. 23(1): 10-19. |
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