Distribution and Sources of Organochlorine Pesticides in Sediments of the Xiangjiang River, South-central China

Overview

Journal Environ Monit Assess

Publisher Springer

Specialty Environmental Health

Date 2013 May 3

PMID 23636501

Citations 1

Authors

Yuanyuan Li

Tian Lin

Yanwen Qin

Lei Zhang

Zhigang Guo

Affiliations

Soon will be listed here.

Abstract

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.

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