Distribution and ecological risk assessment of organochlorine pesticides in surface sediments from the East Lake, China

被引:34
|
作者
Yun, Xiaoyan [1 ,2 ]
Yang, Yuyi [1 ]
Liu, Minxia [1 ,2 ]
Wang, Jun [1 ]
机构
[1] Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词
Organochlorine pesticides; Sediments; HCHs; DDTs; Pollution source; Ecological risk; Aquatic pollution; POLYBROMINATED DIPHENYL ETHERS; POLYCHLORINATED-BIPHENYLS; TAIHU LAKE; RIVER; WATER; HEXACHLOROCYCLOHEXANE; ENDOSULFAN; RESIDUES; HYDROCARBONS; POLLUTANTS;
D O I
10.1007/s11356-014-2893-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Organochlorine pesticides (OCPs) are ubiquitous pollutants, and their presence in urban lakes is a concern for human and ecological health. Surface sediments in the East Lake, China, were collected in winter 2012 and summer 2013 to investigate concentrations, distribution patterns, possible sources, and potential ecological risks of OCPs in this area. The total concentrations of 14 OCPs ranged from 6.3 to 400 ng g(-1) dry weight (dw) with an average concentration of 79 ng g(-1) dw. The mean values of hexachlorocyclohexanes (HCHs) (alpha-, beta-, gamma-, and delta-HCH) and dichlorodiphenyltrichloroethanes (DDTs) (p,p'-DDE, p,p'-DDD, and p,p'-DDT) were 36 and 7.6 ng g(-1) dw, accounting for 45 and 10 % of the total OCPs, respectively. The concentrations of OCPs in sediment samples collected in winter were significantly higher than those in summer, especially the HCHs, of which in winter were two times greater than summer. Composition analyses indicated that DDTs and endosulfan were mainly from historical contribution. Historical use of technical HCH and new input of lindane were probably the source of HCHs in the East Lake. Most sampling sites of HCHs and DDTs were found to have the potential ecological risk based on levels specified in the sediment quality standards.
引用
收藏
页码:10368 / 10376
页数:9
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