该方法用于使用气相色谱仪测定高纯度聚合物级乙烯和丙烯气体或液体中的痕量甲硫醇和乙硫醇，该气相色谱仪配备有在选定离子监测模式下运行的质谱仪。特定仪器经过预配置，能够测定聚合物级乙烯或丙烯中的典型杂质，但该方法仅概述了测定甲硫醇和乙硫醇的程序。甲基硫醇和乙基硫醇在丙烯尾上洗脱，但很容易被独特的离子萃取。每种成分的定量下限为0.05 mol（或质量）ppm。

This method is for determining trace methyl and ethyl mercaptans in high purity polymer grade ethylene and propylene gas or liquid using a gas chromatograph equipped with a mass spectrometer run in selected ion monitoring mode. The specific instrument is preconfigured and is capable of determining typical impurities in polymer grade ethylene or propylene, however this method only outlines the procedure for determining methyl mercaptan and ethyl mercaptan. Methyl and ethyl mercaptan elute on the propylene tail but are readily extracted by unique ions. The lower limit of quantitation for each component is 0.05 mol-(or mass-) ppm.