BS EN ISO 6974-4:2000 天然气.用气相色谱法测定规定的不确定度组分.利用两个封装柱对实验室和在线测量系统进行氮,二氧化碳和C1到C5和C6+碳氢化合物的测定
Natural gas. Determination of composition with defined uncertainty by gas chromatography. Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns