FIELD: analytical chemistry. SUBSTANCE: standard gas mixture is prepared by dosing by weight followed by mixing of a gaseous source substance and a rarefying gas. The source substance is intercalated between layers of beforehand fluorinated graphite. Then a sample is obtained of the resultant intercalated compound. The sample is weighted, heated to the phase transition temperature, and a separated dose is mixed with the rarefying gas. EFFECT: increased efficiency of the process.
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