Natarajan, S.R. and Krishnan, R.M. and Sreeveeraraghavan, S.
(1986)
Analysis of acidic solutions containing hexavalent chromium.
Bulletin of Electrochemistry , 2 (2).
pp. 135-136.
ISSN 0256-1654
Abstract
The volumetric method recommended for the estimation of chromic aciddichromate mixture in a plating
solution involves titration of the diluted test solution apainst standard NaOH usina bromocresol preen as
indicator. This method in the absence of any sharp end point gives inwnsisteniresults. A newmethod
has been worked out in which the free chromic acid is volumetrically estimated by titrating the solution
against standard NaOH with the addition of barium acetate and phenolphthalein as indicator. During this
titration, the chromate and dichromate present in solution is removed as the insoluble barium chromate.
Total hexavalent chromium is separately determined by titration with ferrous ammonium sulphate with nphenyl
anthranilic acid. Suitable methods of calculation were found to give reproducible values in regard
to free chromic acid and dichromate in a mixture.
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