顶空气相色谱法检测生活饮用水中三卤甲烷

Determination of Trihalomethane in Drinking Water by Headspace Gas Chromatography

目的:建立顶空气相色谱方法同时检测饮用水中三卤甲烷的方法。方法:应用顶空气相色谱法对生活饮用水中的三卤甲烷进行分析。结果:本方法检测饮用水中三卤甲烷的4种组分分离度好,在10 min内完成检测,且各组分的曲线相关系数均> 0.998。本方法的最低检出限为三氯甲烷0.015μg·L^(-1)、二氯一溴甲烷0.012μg·L^(-1)、一氯二溴甲烷0.014μg·L^(-1)、三溴甲烷0.015μg·L^(-1),方法精密度较好,相对标准偏差为0.8%~4.6%,不同浓度样品的加标回收率为94.2%~103.3%。结论:该方法检测饮用水中三卤甲烷简单、准确,灵敏度和精密度高。

Objective:To establish a headspace gas chromatography method for simultaneous determination of trihalomethane in drinking water.Method:Headspace gas chromatography was used to analyze the trihalomethane in drinking water.Result:The separation of 4 components of trihalomethane in drinking water was well determined by this method,and the detection was completed within 10 min,and the curve correlation coefficients of each component were>0.998.The minimum detection limits of the method were 0.015μg·L^(-1) for trichloromethane,0.012μg·L^(-1) for dichlorobromomethane,0.014μg·L^(-1) for dichlorobromomethane,and 0.015μg·L^(-1) for tribromomethane.The accuracy of the method was good,and the relative standard deviation ranged from 0.8%to 4.6%.The recoveries of samples with different concentrations ranged from 94.2%to 103.3%.Conclusion:This method is simple,accurate,sensitive and precise for the determination of trihalomethane in drinking water.