DIN EN ISO 6974-4:2002
天然氣.使用氣相色譜法對規(guī)定的不確定度組分的測定.第4部分:采用雙柱法對實驗室和在線測量系統(tǒng)的氮、二氧化碳和C1至指數(shù)5和C6+烴類的測定 (ISO 6974-4:2000); 德文版本 EN ISO 6974-4:2001
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