Distribution of pesticides in typical urban water sources in the lower reaches of the Yangtze River and removal efficiency of treatment plants
This study established a gas chromatography-tandem mass spectrometry(GC-MS/MS)method capable of simultaneously analyzing 190 types of pesticides in water,which was ap-plied to investigate the occurrence of the pesticides in source water and treated water of 13 drinking water treatment plants across five cities located in the lower reaches of the Yangtze River.The in-strument limits of detection ranged from 0.01 to 7.2 ng/L,with a recovery rate between 50.8％and 130.1％.A total of 53 different pesticides were detected in water source,with a total concen-tration level ranging from 198.8 to 759.2 ng/L.The detection frequency of tebuconazole,γ-HCH,metolachlor,hexazinone,and paclobutrazol was 100％,with an average concentration ranging from 11.5 to 63.8 ng/L.Tebuconazole,malathion,carbophenothion,chloroneb,and γ-HCH ex-hibited the highest average concentrations(30.4～101.2 ng/L).The widespread detection of γ-HCH,an organochlorine pesticide that has been banned,suggests the need for enhanced regulation of pesticide production processes.The water treatment plants employing only a conventional treat-ment process(average pesticide removal,30.0％±13.8％)were less effective in pesticide removal compared to the nine plants employing the ozone-activated carbon advanced treatment process(54.4％±10.1％).
The Yangtze RiverSource waterPesticidesDrinking water treatment plantsRe-moval
万方数据
维普
