吹扫捕集-气相色谱-质谱联用法测定生活饮用水中的二氯甲烷

摘要

Objective To establish a method for determination of dichloromethane in drinking water by purge and trap gas chro‐matography‐mass spectrometry .Methods Dichloromethane in drinking water was purged and trapped ,then desorbed and detected by using gas chromatography‐mass spectrometry .Quantitive analysis was conducted by using standard curve under selected ion mo‐nitoring (SIM) mode .Results The operation of this method was simple ,and its limit of detection (LOD) was 0 .005 ng/mL .The recovery rate was higher than 97% ,and the relative standard deviation was less than 5% .Conclusion The method may be appro‐priate to measure dichloromethane in drinking water .%目的：建立生活饮用水中二氯甲烷的吹扫捕集‐气相色谱‐质谱联用测定方法。方法采用吹扫捕集富集水中二氯甲烷，解吸后用气相色谱‐质谱测定，选择离子扫描方式下用标准曲线法进行定量分析。结果该方法操作简便，检出限低（0．005 ng／m L ），回收率均大于97％，相对标准偏差小于5％。结论该方法适合生活饮用水中的二氯甲烷的测定。