EN ISO 6974-3-2001 天然气.用气相色谱法测定规定的不确定度的组分.第3部分:用两填充柱测定氢,氦,氧,氮,二氧化碳和C8的烃类
Natural Gas - Determination of Composition with Defined Uncertainty by Gas Chromatography - Part 3: Determination of Hydrogen, Helium, Oxygen, Nitrogen, Carbon Dioxide and Hydrocarbons up to C8 Using Two Packed Columns