工作场所空气中环氧氯丙烷测定的气相色谱-电子捕获检测器法

摘要

Objective To develop a method for determining epichlorohydrin in the workplace air by gas chromatograph-electron capture detector (GC-ECD).Methods Epichlorohydrin in the workplace air was collected by activated charcoal tubes,desorbed using acetone,and analyzed by GC-ECD.Results A good linearity was obtained in the range of 1.0～50 μg/mL (r=0.999 7).The detection limit was 0.012 μg/ml,while the recovery rate was 88.1％ and relative standard deviation ranged from 1.11％ to 3.57％.The samples could be stored for seven days at room temperature.Conclusion This method effectively eliminates the interferences of alkanes on determination of epichlorohydrin and improves the sensitivity by 1 to 2 orders of magnitude,which can solve the problem of detection limit above standard in GBZ/T 160.58-2004.%目的 建立气相色谱-电子捕获检测器(GC-ECD)法测定工作场所空气中环氧氯丙烷的方法.方法 工作场所空气中环氧氯丙烷经活性炭管采集,丙酮解吸后,GC-ECD法测定.结果 环氧氯丙烷在1.0～50 μg/ml范围内线性良好,r=0.999 7,方法检出限为0.012 μg/ml,回收率为88.1％,精密度在1.11％～3.57％之间,样品在室温下可至少保存7d.结论 该方法有效去除共存烷烃类对环氧氯丙烷测定的干扰,灵敏度提高1或2个数量级,可解决GBZ/T 160.58-2004中“检出即超标”的问题.