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对天津地区永定新河、北排污河和大沽排污河表层水、悬浮物、间隙水样品中的六六六、滴滴涕、七氯等13种有机氯农药进行了分析检测.结果表明,河流中有机氯农药的高污染区主要为天津几大化工厂附近河段,而纪庄子污水处理厂的出水对大沽排污河中的七氯等有机氯农药的含量有所贡献.样品t检验分析表明,秋季和冬季河流中有机氯农药的来源不存在重大差异.不同介质中有机氯农药的组成特征不同,表层水中主要以溶解性较大的六六六为主,而悬浮物中则以滴滴涕、七氯、环氧七氯和异狄氏剂为主.3条河流中的4种不同HCHs异构体以β-HCH的比例最大,说明河流中的HCHs的存在主要是来自于历史遗留;而DDT/DDE和DDT/∑DDTs的比值高于0.5说明近期存在新的DDT使用.
Thirteen kinds of organochlorine pesticides such as BHC, DDT and Heptachlor in the surface water, suspended solids and interstitial water of Tianjin Yongding New River, North Drainage River and Dagu Discharged River were analyzed and tested.The results showed that organic The high-pollution areas of chlorine pesticides mainly for the vicinity of several chemical plants in Tianjin River, and the water discharge of Jizhuangzi sewage treatment plant in the Taku sewage river heptachlor and other organochlorine pesticides content contribute to the sample t-test analysis shows that the fall And there is no significant difference in the source of organochlorine pesticides in winter rivers.Characteristics of organochlorine pesticides in different media are different, mainly in the surface water is dominated by BHC which is more soluble, while suspended solids are mainly composed of DDT, , Epichlorohydrin and endrin.The three HCHs isomers in the three rivers had the largest proportion of β-HCH, indicating that the existence of HCHs in rivers mainly came from the historical remnants while the DDT / A ratio of DDE to DDT / ΣDDTs above 0.5 indicates the recent presence of new DDT use.