北方某城市饮用水中多种类农药污染特征及去除效果

Pollution Characteristics and Removal Efficiency of Multiple Pesticide Compounds in Drinking Water in a Northern City

采用在线固相萃取液相色谱串联质谱法,对北方某城市不同水期水源水及出厂水中107种农药及代谢产物赋存情况进行筛查,同时考察混凝沉淀-砂滤-活性炭处理工艺对农药类污染物的去除效果。结果表明,水源水及出厂水均有农药检出,水源水样品中共检出51种,各指标检出质量浓度中位数在0.10~16.46 ng/L。出厂水共检出42种,各指标检出质量浓度中位数在0.10~14.54 ng/L。枯水期检出农药及其代谢产物50种,检出质量浓度中位数在0.10~15.17 ng/L,丰水期样品共检出20种,检出质量浓度中位数在0.11~5.44 ng/L。相较于常规处理工艺,饮用水经活性炭深度处理后可进一步有效去除农药及其代谢产物。北方某城市饮用水中农药检出浓度水平在纳克每升,低于我国其他区域饮用水中农药类污染物残留,符合我国饮水卫生标准要求,农药类污染物经饮水暴露的风险较低。

An online-solid phase extraction coupled with liquid chromatography tandem mass spectrometry method was used to screening and determination of 107 pesticides and metabolites in raw water and treated water of different water periods in a northern city.The removal effect of pesticide pollutants by the treatment process of raw water-coagulation sedimentation-sand filtration-nation biological activated carbon was also investigated.The results showed that pesticides were detected in both raw water and finished water.51 pesticides and their metabolites were detected in raw water,the median concentrations of each indicator were in 0.10 ng/L and 16.46 ng/L.42 pesticides and their metabolites were detected in finished water,the median concentrations of each indicator were in 0.10 ng/L to 14.54 ng/L.During the dry season,50 pesticides and their metabolites were detected,with a median concentration ranging from 0.10 ng/L to 15.17 ng/L.During the wet season,20 pesticides and their metabolites were detected,with a median concentration ranging from 0.11 ng/L to 5.44 ng/L.Compared with conventional treatment process,drinking water treated with activated carbon can further effectively remove pesticides and their metabolites.All of the concentrations of the pesticides in drinking water in a northern city is at nanograms per liter,which is lower than the residue of pesticide pollutants in other regions of China,it meets the requirements of drinking water standard.The risk of pesticide pollutants being exposed to drinking water is relatively low.