饮用水中三氯甲烷和四氯化碳的顶空气相色谱测定法

Determination of Chloroform and Tetrachloromethane in Drinking Water by Capillary GC with Headspace Sampling

目的建立测定饮用水中三氯甲烷和四氯化碳含量的顶空毛细管柱气相色谱法,同时考察不同来源饮用水中氯仿和四氯化碳的分布状况。方法采用顶空自动进样技术,用特异性 DB-624毛细管柱气相色谱法测定水中三氯甲烷和四氯化碳。结果标准曲线的相关系数为>0.999,相对标准偏差为1.5%～8.3%,三氯甲烷、四氯化碳的平均回收率为97.5%～103.3%;三氯甲烷的线性范围为2.0～10.0μg/L,检出限为0.02μg/L;四氯化碳线性范围为1.0～5.0μg/L,检出限为0.003μg/L。结论该方法简便、快速,具有较好的精密度与准确度,可用于水中三氯甲烷、四氯化碳的测定。

Objective A method of capillary GC with headspace sampling was set up to determine chloroform and tetraehloromethane in drinking water. Methods The special DB-624 capillary colunm was used for GC with headspace sampling. Results The correlation coefficients were 〉0.999 and the values of RSD were less than 10%, the recovery rate was in the range of 97.5%-103.3%. The range of linearity was 2.0-10.0μg/L and 1.0-5.0μg/L, and detection limit was 0.02μg/L and 0.003μg/L for chloroform and tetrachloromethane respectively. Conclusion The method is sensitive, aceuracv and simple for analyzing chloroform and tetraehloromethane in water.