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首页> 外文期刊>Environment international >Occurrence and distribution of organochlorine pesticides (HCH and DDT) in sediments collected from East China Sea
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Occurrence and distribution of organochlorine pesticides (HCH and DDT) in sediments collected from East China Sea

机译：东海沉积物中有机氯农药（六氯环己烷和滴滴涕）的发生和分布

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摘要

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, α-, β-, γ- and δ-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 (μECD). The concentrations of ΣHCH and ΣDDT 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 ΣHCH and ΣDDT 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. ΣDDT in the surface sediments was correlated well with total organic carbon (TOC) content (r~2 = 0.71), while ΣHCH 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.
机译：本研究中使用的沉积物是在2002年11月从东海八个地点的不同深度收集的。选定的有机氯农药的水平和分布模式（OCPs = p，p'-DDT，o，p'-DDT，p，通过超声提取技术，然后用气相色谱（GC）结合微色谱分析技术，研究了样品中的p'-DDE，p，p'-DDD，α-，β-，γ-和δ-HCH）。电子捕获检测器（μECD）。基于干重（dw），表层沉积物中ΣHCH和ΣDDT的浓度在<0.05-1.45 ng / g（平均0.76 ng / g），<0.06-6.04 ng / g（平均3.05 ng / g）的范围内）， 分别。在垂直分布中，ΣHCH和ΣDDT分别在<0.05-2.52 ng / g dw和<0.06-10.94 ng / g dw的范围内。不同采样点的OCP残留量差异很大。表层沉积物中的ΣDDT与总有机碳（TOC）含量相关性很好（r〜2 = 0.71），而ΣHCH没有明显的相关性。分布表明，来自河口附近或海岸附近的沉积物具有较高的TOC含量和较高的OCPs浓度。污染记录表明，过去在长江流域广泛使用OCPs可能会严重影响OCP残留物。

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