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Occurrence and distribution of organochlorine pesticides (HCH and DDT) in sediments collected from East China Sea.

Abstract：

:Sediments used in this study were collected from different depths of eight sites in East China Sea in November 2002. The levels and distribution patterns of the selected organochlorine pesticides (OCPs=p,p'-DDT, o,p'-DDT, p,p'-DDE, p,p'-DDD, alpha-, beta-, gamma- and delta-HCH) in samples were investigated by the technique of sonication extraction followed by the analysis of gas chromatography (GC) coupled with a micro-electron capture detector (muECD). The concentrations of SigmaHCH and SigmaDDT in the surface sediments were in the range of <0.05-1.45 ng/g (mean 0.76 ng/g), <0.06-6.04 ng/g (mean 3.05 ng/g) based on dry weight (dw), respectively. In the vertical distributions, the SigmaHCH and SigmaDDT were in the range of <0.05-2.52 ng/g, <0.06-10.94 ng/g dw, respectively. Residues of OCPs varied significantly with different sampling sites. SigmaDDT in the surface sediments was correlated well with total organic carbon (TOC) content (r2=0.71), while SigmaHCH showed no obvious correlation. The distribution showed that the sediments from the vicinity estuary or near shore had higher TOC contents, and higher OCPs concentrations. The contamination record indicated an extensive use of OCPs in the catchments from Yangtze River in the past might greatly affect the OCP residues.

journal_name

Environ Int

journal_title

Environment international

authors

Yang RQ,Jiang GB,Zhou QF,Yuan CG,Shi JB

doi

10.1016/j.envint.2005.05.027

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

799-804

issue

6

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(05)00097-8

journal_volume

31

pub_type

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