Distribution and sources of organochlorine pesticides in sediments of the Xiangjiang River, south-central China

	Distribution and sources of organochlorine pesticides in sediments of the Xiangjiang River, south-central China
	Yuanyuan Li; Tian Lin; Yanwen Qin; Lei Zhang; Zhigang Guo
	2013
发表期刊	Environmental Monitoring and Assessment
卷号	185 期号:11 页码:8861-8871
摘要	The Xiangjiang River (XR), the second largest tributary of the Yangtze River, is mainly located in Hunan province in south-central China. Nineteen surface sediment samples (the top 3-cm layer) collected from XR were analyzed to determine the concentrations, distribution, sources, and ecological risk of organochlorine pesticides (OCPs). The concentrations of OCPs were 3.0–29.8 ng/g (dry weight) with a mean of 12.6 ± 7.7 ng/g. The widely detected compounds included HCHs, DDTs, HCB, and dieldrin. Overall, the dominant OCPs in the sediments were mainly composed of residual and degradation products, e.g., β-HCH with a mean of 42.2 % in HCHs and p,p′-DDE with a mean of 43.5 % in DDTs, implying that OCPs in the sediments had suffered from long-term aging without fresh inputs in XR. However, there was a high proportion of p,p′-DDT to DDTs in three sites, suggesting that there was use of technical DDT from their surrounding areas at present. The ratios of α-HCH/γ-HCH and p,p′-DDD + p,p′-DDE/DDTs increase from the upper reaches to the lower reaches of XR, suggesting sediments enriched with α-HCH and metabolites DDD and DDE during sediment transport process and could be attributed to the transformation of γ-HCH to α-HCH and DDT to DDE or DDD. The assessment of the ecological risk indicates that the OCPs in the sediments of XR have a moderate adverse biological effect on organisms.
关键词	Ocps Distribution Sources Ecological Risk Surface Sediments Xiangjiang River
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5002
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Yuanyuan Li,Tian Lin,Yanwen Qin,et al. Distribution and sources of organochlorine pesticides in sediments of the Xiangjiang River, south-central China[J]. Environmental Monitoring and Assessment,2013,185(11):8861-8871.
APA	Yuanyuan Li,Tian Lin,Yanwen Qin,Lei Zhang,&Zhigang Guo.(2013).Distribution and sources of organochlorine pesticides in sediments of the Xiangjiang River, south-central China.Environmental Monitoring and Assessment,185(11),8861-8871.
MLA	Yuanyuan Li,et al."Distribution and sources of organochlorine pesticides in sediments of the Xiangjiang River, south-central China".Environmental Monitoring and Assessment 185.11(2013):8861-8871.

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