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 p.gfml 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 H 2 S0 4 • 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 Ti0 2 in various ceramic materials such as feldspar, silica bricks, burnt magnesite, chromite and glass.
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