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

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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.

Item Type: Article
Uncontrolled Keywords: Analysis; Cr(VI)
Subjects: Industrial Metal Finishing
Depositing User: ttbdar CECRI
Date Deposited: 21 Mar 2012 02:33
Last Modified: 21 Mar 2012 02:33

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