目的:比较两种前处理方法检测生活饮用水中挥发性卤代烃的区别。方法:顶空和吹扫捕集与气相色谱联用检测水中的6种卤代烃。结果:两种方法的相对标准偏差均小于5.7%,回收率在96.3%～105.1%之间,具有较好的相关性。结论:两种方法无显著性差异,但吹扫捕集溶剂用量小,更适应在实验室分析。 OBJECTIVE: To compare the differences between two pretreatment methods in detecting volatile halogenated hydrocarbons in drinking water. Methods: Six kinds of halohydrocarbons in water were detected by headspace and purge and trap combined with gas chromatography. Results: The relative standard deviations of the two methods were less than 5.7% and the recoveries were between 96.3% and 105.1%, which showed a good correlation. Conclusion: There is no significant difference between the two methods, but the amount of purge and trap solvent is small, more suitable for laboratory analysis.