该方法用于使用配备脉冲放电氦电离检测器（PDHID）的气相色谱仪（GC）测定高纯度聚合物级乙烯和丙烯气体或液体中的痕量永久性气体。该仪器经过预配置，能够测定聚合物级乙烯或丙烯中的典型杂质，但该方法仅描述了测量二氧化碳、一氧化碳、氢、氮以及氧和氩的混合物的程序。该仪器采用多管柱和定时阀门切换，以消除丙烯对永久性气体的干扰。氮的定量下限为0.05 mol ppm，一氧化碳为0.15 mol ppm，二氧化碳为0.16 mol ppm，氧气为0.25 mol ppm，氢气为0.37 mol ppm。

This method is for determining trace permanent gases in high purity polymer grade ethylene and propylene gas or liquid using a gas chromatograph (GC) equipped with a pulsed discharge helium ionization detector (PDHID). The instrument is preconfigured and capable of determining typical impurities in polymer grade ethylene or propylene, however this method only describes the procedure for measuring carbon dioxide, carbon monoxide, hydrogen, nitrogen, and a composite of oxygen and argon. The instrument uses multiple columns and timed valve switching to eliminate the interference of propylene with the permanent gases. The lower limit of quantitation for nitrogen is 0.05 mol-ppm, carbon monoxide is 0.15 mol-ppm, carbon dioxide is 0.16 mol-ppm, oxygen is 0.25 mol-ppm, and hydrogen is 0.37 mol-ppm.