Abstract
The procedure for spectrophotometric determination of titanium with Tiron (disodium 1,2-dihydroxybenzene-3,5-disulfonate) has been modified by using thioglycolic acid to reduce the Fe(III)-Tiron complex which otherwise interferes with transmittance measurement. Reducation by thioglycolic acid is instantaneous and reoxidation does not occur. Addition of a pH 5.0 buffer to the system maintains the pH within the stability range of the Tiron complex. Large amounts of Mn, Zr, Al, P, F, and citrate do not interfere, but more than 0.2 ppm Cu and 10 ppm Ni are not permissible. P and Zr should not be present together.
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