The determination of carbon in steel by coulometric titration in partially aqueous medium

Abstract

A method that involves coulometric titration of carbon dioxide absorbed in a partially aqueous medium is described for the precise determination of carbon in steel. It does not depend on empirical standardisation and the use of high-vacuum systems and inflammable titrants is avoided. The apparatus used is inexpensive and the technique is simple. The application of appropriate instrumentation could provide a routine control method of high precision.

The analytical performance of the method compares well with that of other techniques considered suitable for reference analysis; 95 per cent. confidence limits of ±0.0007 per cent. of carbon at the 0·05 per cent. of carbon level of 0·008 per cent. of carbon at the 0·9 per cent. of carbon level were obtained in this laboratory.