Distribution of OCPs in surface intertidal sediments of Hangzhou Bay
Distribution of OCPs in surface intertidal sediments of Hangzhou Bay
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发表时间：
2011
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通讯作者：
Cao Aili
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作者：
Cao Aili
采用气相色谱-电化学检测器（GC-ECD）测定了杭州湾潮间带表层沉积物中有机氯农药（OCPs）的含量。结果表明，沉积物中有机氯农药的总含量为2.38 ~ 17.71 ng. g-1（干重）。六氯环己烷（HCH）含量为0.33~8.75 ng·g-1，二氯二苯三氯乙烷（DDT）含量为0.02~3.74 ng·g-1。有机氯农药的空间分布呈现出以下顺序：钱塘江杭州段、杭州湾南岸、杭州湾北岸。沉积物中OCPs含量与TOC含量呈显著正相关（r= 0.626，p0.01），表明沉积物中OCPs含量不仅取决于有机碳含量，还与沿岸水动力条件、沉积物组成及沿着人类活动密切相关。沉积物中DDT和HCH的组成特征表明，它们主要来自农业土壤残留，但在H10和H12站点存在新的输入。杭州湾沉积物中有机氯农药的生态风险不明显。
Organochlorine pesticides (OCPs) in surface intertidal sediments of the Hangzhou Bay were measured by gas chromatography with electrochemical detection (GC-ECD). According to the results,the total content of OCPs in sediments ranged from 2.38 ng·g-1 to 17.71 ng·g-1 (dry weight). The hexachlorocyclohexane (HCH) content ranged from 0.33~8.75 ng·g-1 and the dichlorodiphenyltrichloroethane (DDT) concentration ranged from 0.02~3.74 ng·g-1. The spatial distribution of OCPs presented the following sequence:Hangzhou part of the Qiantang River south bank of Hangzhou Bay north bank of Hangzhou Bay. The correlation between OCPs and TOC concentration in sediments was significant (r=0.626,p0.01),which suggested that the level of OCPs in sediment was not only determined by the organic carbon content,but also closely related to the hydrodynamic conditions,sediment composition and human activity along the coastal zone. The composition characteristics of DDT and HCH in sediments indicated that they mostly come from the residue of agricultural soils,but new input was present at the H10 and H12 sites. There was no obvious ecological risk of OCPs in the sediments of Hangzhou Bay.