工业废气中微量1,1,1-三氯乙烷的气相色谱分析

Determination of Trace 1,1,1 Trichloroethane in lndustrial Waste Gas by Gas Chromatography

采用带有电子捕获检测器的气相色谱仪测定工业废气中的１，１，１－三氯乙烷。研究了色谱分析条件，测定了方法的精密度和准确度。进样量为２０μＬ时，１，１，１－三氯乙烷的最低检出浓度为０．４６ｍｇ／ｍ３，线性范围为１．５４～１１８ｍｇ／ｍ３，相对标准偏差为１．６％～６．８％，加标回收率为９６％～１０６％。在选定条件下，１，１，１－三氯乙烷、四氯化碳、三氯甲烷、二氯甲烷、三氯乙烯、四氯乙烯、一氯二溴甲烷、三溴甲烷等挥发性卤代烃能得到很好的分离，互不干扰。

Determination of 1,1,1 trichloroethane in industrial waste gas by gas chromatography with electron capture detector was conducted.GC separating conditions and its accuracy and precision were also studied. When the input volume of sample was 20μ L,the minimum detection concentration of 1,1,1 trichloroethane was 0.46mg/m 3 with 1.54～118mg/m 3 of linear range, 1.6%～6.8% of relative standard deviation and 96%～106% of recovery rate.Under the selected conditions the volatile halohydrocarbons such as 1,1,1 trichloroethane,carbon tetrachloride, chloroform, dichloromethane,trichloroethylene, tetrachloroethylene, dibromochloromethane and bromoform could be well separated without interference with each other.