BS EN ISO 6974-5-2014 天然气. 采用气相色谱法对组成及相关不确定性的测定. 氮, 二氧化碳, C1至C5烃类及C6+烃类的等温法
Natural gas. Determination of composition and associated uncertainty by gas chromatography. Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons