淮河江苏段水中有机氯农药污染特征分析

Pollution characteristics of organochlorine pesticides in water of Jiangsu reach of Huaihe river basin

目的了解淮河流域江苏段某地水中有机氯农药的污染现状。方法于2015年8月采集该地3个水厂的水源水、出厂水,同时采集当地主要3条河流的河水及其附近深井水,利用气相色谱高分辨磁质谱测定水中25种有机氯农药。结果所有样品中均检出有机氯农药,含量在0.04~8.68 ng/L之间。主要以DDT及其降解产物、甲氧氯、六六六和氯丹为主。自来水厂对有机氯农药有一定的去除效果,但不能完全去除高浓度有机氯农药。深井水水质受周围环境影响较大。结论该地区水源水、出厂水、河水和深井水均存在有机氯农药污染,地下水有机氯农药含量受周围环境影响。

Objective To investigate the presence of organochlorine pesticides in water of Huaihe river basin Jiangsu province.Methods Source water,finished water,surface water and deep groundwater were collected from south,middle and north area in August 2015.The water samples were analyzed with gas chromatography high resolution mass spectrometry.The analytes included 25 organochlorine pesticides.Results The organochlorine pesticides were found in all samples,the levels were in the range of 0.04 ~8.68 ng/L.The DDT,DDD,DDE,hexachlorocyolohexane,methoxychlor and chlordane were the dominant organochlorine pesticides.The water plants had some effect in removing organochlorine pesticides but could not remove them thoroughly.The groundwater was influenced by environment.Conclusion All kinds of waters,source water,finished water,have been found contaminated with low level organochlorine pesticides,the deep groundwater was contaminated by the environment.