Nobuhisa Matano1 and Jun Fujiwara1
1National Research Institute for Metals, Tokyo
Sulfur in iron and copper alloys with high sulfur contents tends to evaporate as sulfur compounds in the vacuum fusion process and to interfere with the determination of oxygen with the conventional vacuum fusion-oxidation method. Applying the vacuum fusion-gas chromatographic method, the effect of sulfur in the sample on the oxygen determination was investigated and the following results were obtained.
(1) In the case of Fe-S alloys, the condensable materials in the extracted gases were carbon disulfide, carbonylsulfide and carbon dioxide. The ratio of sulfur as carbon disulfide to total sulfur in the sample was 10∼50 per cent. The ratio of oxygen as carbonylsulfide to total oxygen in the sample was under 1 per cent. The ratio of oxygen as carbon dioxide to total oxygen in the sample was over 3 per cent.
(2) Cu-S alloys everporated a large quantity of sulfur compounds.
(3) The oxygen in the sample can readily be determined as carbon monoxide and carbon dioxide without the interference of sulfur compounds, when a column of molecular sieve 13X and silicagel connected in series is used.
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