直接进样-气相色谱法测定工作场所空气中二氟氯甲烷

Determination of difluorochloromethane in workplace air by direct injection gas chromatography

目的建立工作场所空气中二氟氯甲烷的直接进样–气相色谱测定方法。方法空气中的二氟氯甲烷由铝塑复合膜气体采气袋采集后,直接进样,经DB-1毛细管色谱柱分离,火焰离子化检测器检测。结果本方法在二氟氯甲烷质量浓度为1.50~15042.90 mg/m^3时线性关系良好,相关系数为0.99996;最低检出限为1.26 mg/m^3,最低定量下限为3.78 mg/m^3;最低检出浓度为1.26 mg/m^3,最低定量浓度为3.78 mg/m^3;加标回收率为98.34%~99.19%,批内相对标准偏差(RSD)为1.82%~3.72%,批间RSD为2.17%~4.17%;室温下样品可保存7 d。结论本方法适用于工作场所空气中二氟氯甲烷的测定。

Objective To establish a method of determination of difluorochloromethane in workplace air by direct sampling gas chromatography.Methods Difluorochloromethane in workplace air was collected with aluminum plastic composite film airbag and then directly injected.Difluorochloromethane was separated by DB-1 capillary column and detected with hydrogen flame ionization detector.Results Good linearity was obtained in the range of 1.50-15042.90 mg/m^3 with the correlation coefficient of 0.99996.The limit of detection was 1.26 mg/m^3 and the limit of quantitation was 3.78 mg/m^3.The minimum detection concentration was 1.26 mg/m^3 and the minimum quantification concentration was 3.78 mg/m^3.The standard recovery was 98.34%-99.19%.The within-run relative standard deviation(RSD)and the between-run RSD were 1.82%-3.72%and 2.17%-4.17%,respectively.The samples can be stored at room temperature for at least 7 days.Conclusion This method is suitable for difluorochloromethane detection in workplace air.