Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9632631 | Hydrometallurgy | 2005 | 8 Pages |
Abstract
A technique for the colorimetric estimation of purified Cyanex 272 has been developed. The technique consists of the digestion of pure sample or its aqueous solution with concentrated nitric acid (70%)-perchloric acid (70%) mixture for 1 h. The oxidizing mixed acid quantitatively converts Cyanex 272 to a clear solution of orthophosphate that can be easily estimated by the molybdenum-blue colorimetric method at 830 nm. The method is sensitive with a molar extinction coefficient of â¼2.6Ã104 and reproducible within ±2%. Applying this technique of analysis, the dimerization constant (K2), distribution or partition coefficient (Kd) and ionization constant (Ka) of the purified Cyanex 272 (bis-2,4,4-trimethylpentylphosphinic acid, BTMPPA) have been estimated to be 190, 53 and 5.52Ã10â4, respectively.
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Authors
R.K. Biswas, M.A. Habib, H.P. Singha,