Pedosphere 15(3): 301--309, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Residual levels and new inputs of chlorinated POPs in agricultural soils from Taihu Lake region |
GAO Hong-Jian , JIANG Xin, WANG Fang, BIAN Yong-Rong, WANG Dai-Zhang, DEND Jian-Cai and YAN Dong-Yun |
| Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: ghj7155@sina.com.cn |
| ABSTRACT |
| Selected persistent organochlorine pesticides (OCPs), including 1,1,1-trichloro-2,2-bis (p-chlorophenyl) ethane (DDT) and its principal metabolites 1,1-dichloro-2,2-bis (p-chlorophenyl) ethylene (DDE) and 1,1-dichloro-2,2-bis (p-chlorophenyl) ethane (DDD), hexachlorocyclohexane (HCH) and its isomers (α-, β-, γ-, and δ-HCH), hexachlorobenzene (HCB), endosulfan, dieldrin, and endrin were quantified to determine current levels of organochlorine pesticides, to assess the ecotoxicological potential, and to distinguish previous and current inputs in agricultural soils from the Taihu Lake region. Gas chromatography equipped with a 63Ni electron-capture detector (GC-ECD) system was employed. Thirteen OCPs were detectable in all soil samples, with DDTs being the main residues, and HCHs had the second highest level of OCP residues. Although OCP residual levels were lower than those in 1990s, the residual levels for most of the DDTs and some of HCHs were still higher than the national environmental standards for agricultural soils. The ratios of DDT/DDE and γ-/α-HCH in twelve soils indicated that new inputs could be present in the soils. Thus, efforts should be made to completely ban the production of OCPs and their use in agriculture so as to reduce the threat of OCPs to food quality and human health. |
| Key Words: agricultural soils, chlorinated persistent organic pollutants (POPs), new input, residual levels, Taihu Lake region |
| Citation: Gao, H. J., Jiang, X., Wang, F., Bian, Y. R., Wang, D. Z., Dend, J. C. and Yan, D. Y. 2005. Residual levels and new inputs of chlorinated POPs in agricultural soils from Taihu Lake region. Pedosphere. 15(3): 301-309. |
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