NF X20-510-4*NF EN ISO 6974-4:2003
天然气.用气相色谱法测定已规定的不确定性的组分.第4部分:用双填充柱测定实验室和在线测量系统用的氮、二氧化碳、C1至C5(包括C5)和C6+的烃类
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4 : determination of nitrogen, carbon dioxide and C1 up to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns.