Abstract
An improved method for the spectrophotometric determination of titanium using chromotropic acid is described. The optical density of Ti-chromotropic acid complex at 470 nm has been found to be independent of pH from 3 to 6. Acetic acid sensitises the optical density of the complex. The interfering effect of Fe(III) up to 200 μg/ml has been overcome by adding 5 mg Fe(III) to both the standard and the test solutions followed by reduction with a mixture of ascorbic and acetic acids at pH 3–4. The photosensitivity of chromotropic acid has been eliminated by preparing the reagent solution in 0.3N H2SO4. The development of Ti-chromotropic acid colour is instantaneous and the optical density does not change for a period of at least 12 hrs. The method has been successfully applied to the determination of traces of TiO2 in various ceramic materials such as feldspar, silica bricks, burnt magnesite, chromite and glass.
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