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湖泊科学  2011 

博斯腾湖沉积物中有机氯农药的分布特征及生态风险评价

DOI: 10.18307/2011.0105

Keywords: 有机氯农药,博斯腾湖,沉积物,分布,风险评价

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Abstract:

新疆博斯腾湖表层沉积物中有机氯农药进行分析,探讨其分布特征及来源,并对其生态风险进行评价.结果表明,沉积物中总有机氯农药的含量为2.15-16.80ng/g,其中氯丹和滴滴涕的含量较高,分别为0.12-12.08ng/g、O.42-5.13ng/g.博斯腾湖总有机氯农药的含量从入湖口到湖心呈现出下降的趋势,说明其污染主要来源为上游开都河、黄水沟和附近农田排水的输入.沉积物中滴滴涕的组成特征表明,滴滴涕主要来自于农田土壤的历史残留,近期没有污染源输入;反式氯丹和顺式氯丹的比值表明该地区为氯丹的直接施用地,近期可能仍有氯丹输入.与沉积物风险评估值相比较,氯丹的含量超过了风险评价高值,博斯腾湖沉积物中有机氯农药存在较高的生态风险。

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