Transactions of the INDIAN CERAMIC SOCIETY Vol. 32 1973
Spectrophotometric Determination of Silicon by the
Heteropoly Blue Method Using Ascorbic Acid
as the Reducing Agent
B. c. SINHA AND s. DASGUPTA
Pages : 16-20
DOI : 10.1080/0371750X.1973.10840553
Abstract
A comparative study of six reducing agents has been made for determination of
traces of silicon by the heteropoly blue method. Ascorbic acid has been found to be
the most suitable reducing agent in respect of sensitivity, rapidity of colour development,
stability of the final colour and easy availability. The effect of iron has also been critically
examined and successfully eliminated by a small addition of iron to both the test
and the standard reference solutions and then complexing it with EDT A. Based on
these observations, an analytical procedure has been worked out and successfully
employed for the determination of residual silicon in the filtrate after separation of
major silica for gravimetric determination in various silicate materials.