Study on Determination of Low Content of Carbon in Steels by Non-aqueous Titration

Abstract

An attempt has been made to study the non-aqueous titrimetric analysis of low content of carbon insteels. The procedure studied is as follows. The carbon dioxide, which is evolved by the combustion of sample in oxygen stream at 1350°C, is absorbed into monoethanolamine solution and titrated with the standard solution of tetra-n-butylammonium hydroxide, thus the carbon content being obtained. The experimental results showed that the present method is simple, rapid, and of good reproducibility, that is, coefficients of variation were 7.31% and.1.62% as for the samples of carbon contents of 0.0011% and 0.0043%, respectively.
As the blank value is as small as about 4μg all through the procedure, this method can be applied to analysis of very low content of carbon (about 5μgC).