气相色谱法测定空气中三氯乙烯和四氯乙烯

To Determine Trichloroethylene and Tetrachloroethylene in Air by Gas Chromatography

应用气相色谱法以 5 %PEG - 6 0 0 0为固定液、6 2 0 1为担体填充柱分离 ,电子捕获检测器检测 ,直接进样测定环境空气中三氯乙烯和四氯乙烯。对 0 0 2 9mg/m3 三氯乙烯和 0 0 5 6mg/m3 四氯乙烯标准样作重复 5次测定 ,其相对标准差分别为 5 7%和 1 5 % ,并在实际样品中进行加标回收试验 ,回收率三氯乙烯在 90 %～ 110 %、四氯乙烯在 94%～ 10 8%之间。检测限分别为 0 0 0 6mg/m3 和 0 0 0 0 5mg/m3,完全能满足环境空气监测的需要。

Trichloroethylene and tetrachloroethylene in environmental air were determined directly by gas chromatography, with taking 5% PEG-6000 as fixed liquid and 6201 as carrier, then to isolate by stuffing column and to detect by electron capture detector. The standard samples of 0 029 mg/m 3 trichloroethylene and 0 056 mg/m 3 tetrachloroethylene were titrated five times repeatedly. Their relative standard deviations were 5 7% and 1 5% respectively. In sampling analysis for the practical samples, the recovery rate of trichloroethylene was 90%～110%, tetrachloroethylene was 94%～108%. Their detection limits were 0 006 mg/m 3 and 0 000 5 mg/m 3, were suitable for the need of environmental air's monitoring.