气相色谱法直接进样测定饮用水中挥发性卤代烃

Determination of Volatile Halohydrocarbons in Drinking Water by Gas Chromatography with Direct Aqueous Injection

利用大口径毛细管柱气相色谱 /电子捕获检测器 ( GC/ ECD)方法 ,直接进样测定了饮用水中的三氯甲烷、四氯化碳、一溴二氯甲烷、二溴一氯甲烷、三溴甲烷等 5种挥发性卤代烃。所建立的方法简便、快速、灵敏度高 ,并具有较好的精密度与准确度。当 5种卤代烃化合物的质量浓度平均值为 9.0 3～ 2 0 .19μg/ L时 ,CV为 2 .9%～ 7.5% ,标准差为 0 .3～ 0 .9μg/ L。样品的加标回收率为 80 %～ 118% ,标准曲线的相关系数为 0 .998和0 .999。 ECD的温度为 350℃时 ,其最低检测限在 0 .1～ 0 .7μg/ L范围内 。

The volatile CHCl 3, CCl 4, CHBrCl 2, CHBr 2Cl, CHBr 3 in drinking water have been determined by wide bore capillary gas chromatography/electron capture detector(GC/ECD) with direct aqueous injection method. The method is simple, fast and highly sensitive. It has better accuracy and precision. When the average mass concentration of five halohydrocarbons ranged from 9.03 to 20.19 μg/L, the relative deviations ranged from 5.7% to 9.1%, RSD ranged from 2 9% to 7 5%. The standard deviations ranged from 0.3 to 0.9. Correlation coefficients were 0.998 and 0.999. The detection limits ranged from 0.1 to 0.7 μg/L and were lower than those in other work when the temperature of ECD was 350 ℃.