Abstract
The gas chromatography was used for determination of oxygen in cast iron. Carbon monoxide and other gases evolved from the molten sample were swept with argon from an extraction system, and were separated in each by the gas chromatography. The amount of oxygen was obtained from the amount of carbon monoxide estimated. The cast iron sample was fused with graphite tablet in a semi-sintered alumina crucible in a high frequency combustion apparatus.
The values obtained by the proposed method were compared with those by the gravimetry on the cast iron samples oxidized by heating for formation of 50400 ppm of rust. Values by both methods were linearly related. A routine precision of ±0.17 ppm was obtained on oxygen of white cast iron with concentrations as low as 5.0 ppm.
