气相色谱-质谱法测定饮用水中消毒副产物卤代腈

摘要

采用顶空加盐气相色谱-质谱法检测饮用水中的消毒副产物氯乙腈、二氯乙腈和三氯乙腈，并对样品前处理方法及GC/MS仪器条件进行优化，使得3种卤代腈在5．00μg/L ～80．0μg/L 范围内线性良好，方法检出限分别为2．52μg/L、1．02μg/L和1．57μg/L。空白水样的加标回收率为75．9％～94．1％， RSD为3．6％～6．2％。%A method was developed for the determination of chloroacetonitrile、dichloroacetonitrile、trichloro-acetonitrile in drinking water by gas chromatograpy mass spectrometry.The conditions for sample pretreatment and GC-MS were investigated and optimized.Salt was added to the samples before headspace .The detection was carried out by headspace GC/MS in scan monitoring, and m/z 75、48、74、82、108、110 was selected as the quali-tative ions.Selected ion monitoring mode was quantitative method.The detection limits of headspace method were 2.52 μg/L、1.02 μg/L and 1.57 μg/L,respectively and the recoveries ranged from 75.9% to 94.1%, RSDs were in the range of 3.6%~6.2%.The accuracy,reliability and sensitivity of the method made it suitable for the determination of three halogenated nitrile in drinking water.