溶剂解吸-气相色谱法测定工作场所空气中碳酸二甲酯

Determination of dimethyl carbonate in workplace air by solvent desorption-gas chromatography

目的建立测定工作场所空气中碳酸二甲酯(DMC)的溶剂解吸-气相色谱法。方法空气样品经活性炭管采集后,以二硫化碳解吸,分离采用经二甲基聚硅氧烷毛细管色谱柱,检测采用火焰离子化检测器。结果DMC质量浓度在2.14~1.07×10^(4)mg/L时线性关系良好,相关系数>0.999;检出限为0.14 mg/L,定量下限为0.47 mg/L;以采集1.5 L工作场所空气计算时,最低检出浓度、最低定量浓度分别为0.10和0.32 mg/m^(3)。方法的平均解吸效率为96.2%~102.0%,批内和批间相对标准偏差均为0.9%~2.3%。样品在4℃下至少可保存7 d。结论本方法解吸效率和灵敏度高,精密度好,操作简单;适用于工作场所空气中DMC的测定。

Objective To establish a solvent desorption-gas chromatography method for determination of dimethyl carbonate(DMC)in workplace air.Methods The air samples were collected using activated carbon tubes,desorbed by carbon disulfide,separated by dimethylpolysiloxane capillary columns,and detected by a flame ionization detector.Results The linear range of DMC was 2.14 to 1.07×10^(4)mg/L,and the correlation coefficient was greater than 0.999.The detection limit was 0.14 mg/L,the lower limit of quantification was 0.47 mg/L,the minimum detection concentration was 0.10 mg/m^(3),and the minimum quantification concentration was 0.32 mg/m^(3)(based on 1.5 L workplace air).The average desorption efficiency of the method was 96.2%to 102.0%.Both the within-run and between-run relative standard deviations were 0.9%to 2.3%.The samples could be stored for at least seven days at four celsius degree.Conclusion This method shows high desorption efficiency,high sensitivity,good precision and is simple in using.It can be used for the determination of DMC in workplace air.