固相萃取-气相色谱-质谱法在自来水有机污染物检测中的应用OACHSSCD

To establish an accurate and universally applicable method for the determination of organic pollutants in tap water,solid phase extraction-gas chromatography-mass spectrometry was employed to analyze tap water samples collected from 12 cities across four regions of China:North China,East China,South China,and Southwest China.By optimizing pretreatment and instrumental conditions,key parameters were determined,including enrichment with C18 cartridges,elution with n-hexane-acetonitrile,and detection under selected ion monitoring mode.The results showed that the spiked recoveries ranged from 82.3%to 95.7%,with relative standard deviations less than 5.0%.The limits of detection ranged from 0.008 μg/L to 0.035 μg/L,and the limits of quantification ranged from 0.027 μg/L to 0.117 μg/L.Analysis of actual samples indicated that polycyclic aromatic hydrocarbons and organochlorine pesticides were detected in all regions,with concentrations below the limits specified in the Standards for Drinking Water Quality(GB 5749-2022).The method exhibits high sensitivity,good precision,and strong matrix adaptability,and is suitable for routine monitoring of low-concentration organic pollutants in tap water from different regions.