以Tenax-TA吸附管为吸附剂，采用热解析-气相色谱联用技术测定工作场所空气中4种丁醇异构体含量。对热解析和色谱条件进行优化，用标准试样测定了线性范围和工作曲线，考察了方法的精密度和准确度，并采用该方法对工作场所空气中的4种丁醇进行了测定。实验结果表明，4种丁醇的质量浓度在各自配制的质量浓度范围内呈现良好的线性关系，相关系数为0.999 4~0.999 9。标样回收率在96.2%~105%，6次重复测定的相对标准偏差均小于3%，4种物质的热解析效率均高于98%，4种丁醇的检出限为0.003~0.005 mg/m³。该方法具有良好的准确性、精密度和灵敏度，能很好地适用于工作场所空气检测。

A method for simultaneously determining the contents of 4 kinds of butanol isomers in the air of workplace is developed by thermal desorption/gas chromatography combined technique using Tenax-TA adsorption tube as adsorbent.The thermal desorption and gas chromatography conditions are optimized,and the precision and accuracy of this method are investigated by determining the linear range and working curve through using standard samples.This method is applied to the determination of 4 kinds of butanol isomers in the air of workplace.The determination results show that the mass concentrations of 4 kinds of butanol isomers exhibit a good linear relationship within each formulated mass concentration range,with correlation coefficients of 0.999 4-0.999 9.The recoveries of standards samples range from 96.2% to 105%,and the relative standard deviations of six repeated measurements are all within 3%.Thermal desorption efficiency of four isomers are all above 98%,and their detection limits are in the array of 0.003-0.005 mg·m^-3.This method shows good accuracy,precision and sensitivity,and is suitable for the detection of the air in workplace.

黄宏(1987-),男,学士,工程师,研究方向为化工与环境检测,215106989@qq.com