ISO 6974-4:2000

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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

ISO 6974-4:2000 refers to an international standard that outlines a method for determining the composition of natural gas using gas chromatography, specifically focusing on the measurement of components like nitrogen, carbon dioxide, and hydrocarbons from C1 to C5, as well as heavier hydrocarbons grouped as "C6+" - all within a laboratory or on-line measuring system utilizing two separate columns for accurate analysis