Determination of titanium(IV) with o-hydroxyhydroquinonephthalein and hydrogen peroxide.

1 January 1985

journal article
Published by Japan Society for Analytical Chemistry in Analytical Sciences

Vol. 1 (5) , 429-433
https://doi.org/10.2116/analsci.1.429

Abstract

The color reaction between o-hydroxyhydroquinonephthalein(Qnph), titanium(IV)[Ti(IV)] and hydrogen peroxide was studied. The spectrophotometric determination of micro amounts of Ti(IV) using Qnph and hydrogen peroxide in a weak acidic media is then discussed. The optimum acidities were pH 4.2-5.0; the molar absorptivity of Qnph-hydrogen peroxide-Ti(IV) solution was 3.1×10⁵dm³ mol^-1 cm^-1 at 595nm. The color intensity of Ti(IV) complex solution was stable for 2h, and was found to obey Beer′s law within the concentration range of 0.2-2.5μg per 10ml. The method was simple and reliable, and may be applied to the determination of Ti(IV) in various concentrations of titanium alloys and pigments.

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