气相色谱法测定空气中苯、甲苯、二甲苯、正己烷

Detection of n-hexane,benzene,toluene and xylene in workplace air by vapor phase chromatography

目的建立工作场所空气中正己烷、苯、甲苯、二甲苯同时测定的热解吸气相色谱方法。方法按照《工作场所空气中有毒物质检测方法研究规范》的要求进行实验室实验及现场实验。结果正己烷、苯、甲苯、二甲苯方法的重现性好,平均相对标准偏差在4.9%以内;方法的最低检测浓度为均在2.4mg/m3以内;热解吸效率均在80%以上;空气中正已烷、苯、甲苯、二甲苯等在本方法条件下可同时分别测定。结论此方法各项指标均达到《工作场所空气中有毒物质检测方法研究规范》的要求,适用于工作场所空气中正已烷、苯、甲苯、二甲苯的同时测定现场监测。

Objective To establish thermal desorption vapor phase chromatography for detection of n-hexane, benzene, toluene and xylene in workplace air. Methods The experiments were conducted in laboratory and on the site according to standard technique for detection of toxic substances in workplace air. Results The detection of n-hexane, benzene,Toluene and xylene have a good reproducibility, and the relative standard deviation （RSD）was less than 4.9%,The minimum detection limit was 2.4mg/m3, the recovery rates of thermal desorption vapor phase chromatography were over than 80%. N-hexane,benzene,toluene and xylene in workplace air could be detected simultaneously by this method. Conclusions This method meets the requirement of standard technique for detection of toxic substances in workplace air, which is suitable for simultaneous detection of n-bexane, Benzene, Toluene and xylene in workplace air.