Determination of carbon in high-purity iron by a modified combustion method |
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| Authors: | Joeng-Shein Chen Ulrich Barth and Erhard Grallath |
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| Institution: | (1) Laboratorium für Reinststoffanalytik, Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Bunsen-Kirchhoff-Strasse 13, D-4600 Dortmund, Federal Republic of Germany;(2) Present address: Material Research Laboratories, Industrial Technology Research Institute, 195-5 Chung-Hsing Road Section 4, 31015 Chutung, Hsinchu, Taiwan |
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| Abstract: | Summary A newly developed apparatus was used for the determination of carbon in pure and high-purity iron samples. It enables the differentiation between the carbon content of the surface and the bulk by temperature-controlled heating in an oxygen flow. The carbon dioxide formed was measured by an IR-gas analyzer, type BINOS. At sample weights of about 0.1 g with surface areas of about 0.5 cm2, carbon concentrations of  0.04  g/cm2 of the surface and of 0.2 g/g of the bulk can be determined. By means of the results on 6 certified reference materials with low carbon concentrations and on 7 high-purity iron samples, the influence of sample form, treatment and storage on surface and bulk carbon is demonstrated. The findings confirm the already formerly stated tendency to too high values in the certificates of reference samples with carbon concentrations in the lower g/g range.
Bestimmung von Kohlenstoff in Reinsteisen nach einem modifizierten Verbrennungsverfahren |
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