期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 87, 期 -, 页码 89-97出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2012.10.001
关键词
Organochlorine pesticides (OCPs); Distribution; Risk; Temporal trends
资金
- National Natural Science Foundation of China [41001329]
- special fund for the Public Service Sector of the State Environment Protection Agency of China [201009026]
- Natural Science Foundation of Hebei Province [B2011502017]
- Fundamental Research Funds for the Central Universities [12MS01]
Residues of 24 organochlorine pesticides (OCPs) including DDT metabolites were investigated in the water and surface sediments from the lower reaches of the Yangtze River to evaluate their pollution and potential risks. Concentrations of OCP residues (Sigma OCP2 ranged from 3.07 to 23.70 ng/L in water and 0.67 to 58.80 ng/g dw in sediments) were generally within safe levels, while adverse biological effects are likely from DDT pollution in the lower reaches. HCH and DDT residues dominated the OCPs. High detection rates but low concentrations of some other OCPs, such as chlordane and endosulfan, were detected in both water and sediments. The HCH and DDT residues in the lower reaches primarily originated from historical use of technical HCH and DDT, although additional sources of lindane and dicofol existed in the region. Temporal trends of pesticide contamination levels indicated that HCH concentrations have decreased over the past decades. However, there was no obvious trend of declining DDT concentrations in the sediments from the Yangtze River. The DDT metabolites, DDMU (bis (chlorophenyl)-1-chloroethylene), DBP (dichlorobenzophenone) and DDM (bis (chlorophenyl) methane), were also investigated for the first time in water and sediments from the Yangtze River. (C) 2012 Elsevier Inc. All rights reserved.
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