Colorimetric estimation and some physicochemical properties of purified Cyanex 272 |
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Affiliation: | 1. School of Chemistry & Material Science, Key Laboratory of Magnetic Molecules and Magnetic Information Material, Ministry of Education, Shanxi Normal University, Linfen 041004, PR China;2. Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry & Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China |
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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 ∼2.6×104 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 5.52×10−4, respectively. |
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