用顶空进样-气相色谱法在低于氯化苄沸点的条件下测定季铵盐中的氯化苄的定量分析方法。氯化苄的检出限5.0ug/g,线性范围50ug/g～250ug/g,相关系数0.9992,相对标准偏差5.5%,氯化苄的加标回收率94.5%～96.7%。该方法操作简单,填补了国内空白,适合产品质量控制及相关质监部门快速测定其含量。 Quantitative analysis of benzyl chloride in quaternary ammonium salts by headspace injection - gas chromatography at a temperature below the boiling point of benzyl chloride. The detection limit of benzyl chloride was 5.0ug / g, the linear range was 50ug / g ~ 250ug / g, the correlation coefficient was 0.9992, the relative standard deviation was 5.5% and the recovery of benzyl chloride was 94.5% ~ 96.7%. The method is easy to operate and has filled the gap in China. It is suitable for product quality control and related quality supervision departments to quickly determine the content.