Transactions of the INDIAN CERAMIC SOCIETY Vol. 33 1974
Spectrophotometric Determination of Traces
of Titanium in Silicates
B. c. SINHA AND s. DAS GUPTA
Pages : 20-24
DOI : 10.1080/0371750X.1974.10840833
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 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 H2S04• 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 Ti02 in various ceramic
materials such as feldspar, silica bricks, burnt magnesite, chromite and glass.
