A Three-minute Gas Chromatographic Analysis of the Main Constituents of Mine Atmospheres.
NTIS: PB 213 968 :7 pages
The Bureau of Mines has developed a very rapid gas chromatographic method for routine determination of oxygen, nitrogen, methane, and carbon dioxide in mine atmosphere samples. Analysis is accomplished in 3 min; readout appears on a single strip chart. The gas sample is split between two columns contained in separate chromatographs. A 5-a molecular sieve column separates oxygen, nitrogen, and methane; a porous polymer column separates carbon dioxide from an air peak. Direct selective analysis of methane from this unresolved air peak is accomplished using a hydrogen flame ionization detector (fid). Carbon dioxide is catalytically converted to methane and detected by fid.
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