GB/T 27894.4-2012
天然气 在一定不确定度下用气相色谱法测定组成 第4部分:实验室和在线测量系统中用两根色谱柱测定氮、二氧化碳和C1至C5及C6+的烃类
Natural gas.Determination of composition with defined uncertainty by gas chromatography.Part 4:Determination of nitrogen,carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns
GBT27894.4-2012, GB27894.4-2012