气相色谱法同时测定工作场所中异亚丙基丙酮和苯系物

目的:建立工作场所空气中异亚丙基丙酮、苯、甲苯、二甲苯的气相色谱同时测定方法。方法:工作场所空气用管采集,0.5%甲醇的二硫化碳溶液解吸,程序升温初始35℃保持7 min,以30℃/min升温至120℃保持5 min,载气流量1.0 ml/min,HP-5毛细管色谱柱分离,FID检测。结果:各组分离效果好,解吸效率分别为92.3%～98.6%,在线性范围内,浓度与峰面积呈良好线性(r=0.999),回收率分别为90.5%～97.6%,检出限分别0.3μg/ml～1.2μg/ml,相对标准偏差(RSD)均小于5.0%。结论:该方法简便、灵敏、准确。适用于三苯及异亚丙基丙酮混合污染的喷漆业、制鞋业等行业工作场所空气的检测。

Determination of mesityl oxide and benzene,toluene and xylene in workplace air by gas chromatography

Objective:To establish a method for determination of mesityl oxide and benzene and xylene in workplace air by gas chromatography.Methods: The target chemicals in air were sampled by active carbon tube and desorbed by solvent of 0.5% methanol in carbon disulfide.The separation was performed on HP-5 capillary column with the programmed temperature initial at 35℃ for 7 min and then increasing to 120℃ by 30℃/min for 5 min.The flowrate of carrier gas was 1.0 ml/min,and the chemicals were detected with flame ionization detector.Results: The result showed that the separation of benzene,toluene,Mesityl oxide,m-xylene,p-xylene,o-xylene was good.The desorptive efficiency attained 92.3%~98.6%.Thecalibyation curve was linear in the concentration(r=0.999) and the recoveries was 90.5%~97.6%,detection limit was(0.3~1.2)μg/ml,RSD was less than 5.0%.Conclusion: This method is simple,sensitive and applicable for determination of the chemicals in workplace air of paint industry,footwear industry and others.