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OALib Journal期刊
ISSN: 2333-9721
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沁河沿线有机氯农药的分布特征及风险评价
DOI: 10.3724/SP.J.1145.2013.00670, PP. 670-676
Keywords: 沁河,六六六,滴滴涕,水体污染,表层沉积物,风险评价
Abstract:
为了解沁河有机氯农药（ocps）的残留状况，利用气象色谱仪测定了沁河干流沿线水体和表层沉积物中六六六（hchs）和滴滴涕（ddts）的含量，并分析了其来源.结果表明，沁河水体和表层沉积物中大部分样点均检出有机氯农药的残留，其中水体中hchs和ddts含量分别为nd-2.23ng/l和nd-19.35ng/l；表层沉积物中hchs和ddts含量分别为nd-13.72ng/g和nd-14.02ng/g.对组成特征的分析表明，沁河沿线中游没有新的商品hchs的输入，而下游存在一定林丹的使用；沁河中下游有新的ddts的输入，其主要来源是三氯杀螨醇和历史残留.与国内其他主要河流相比，沁河沿线水体和表层沉积物中有机氯农药的含量处于中等水平.根据淡水生态系统风险评估值进行比较，沁河沿线表层沉积物中有机氯农药的生态风险较低.图5表4参30
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