Abstract
The d.c. carbon-are extraction technique for the emission spectrometric determination of the gaseous element content of metals has been adapted to the direct-reading determination of oxygen in high and low alloy steels. A near-infrared sensitive phototube (EMI 9558B), having a low dark current, is used as the detector. The O 7772 Å line is isolated with a small, 0·5 meter, table-model spectrometer and a group of argon lines near 7635 Å is selected by an interference filter and used as the internal standard. The method has been applied to high and low-alloy steels having oxygen concentrations ranging between 0·0048 and 0·085 wt.%. Over a period of 1 month the analytical results showed a coefficient of variation of 5·6%.
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