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We have conducted solvent extraction of Pt(IV) from HCl solution with Alamine336. Solvent extraction reaction in our system was determined from the experimental results by graphical method. The equilibrium constant of the solvent extraction reaction was estimated from our experimental results by considering the activity coefficients of chemical species present in the aqueous phase with Bromley equation. Bromley interaction parameter between hydrogen ion and PtCl 2- 6 was evaluated from the solvent extraction data reported in the literature. Solvent extraction of PtCl 4 by Alamine336 and the corresponding equilibrium constant in our experimental range can be represented by PtCl 2- 6 + R 3 NH 2 Cl 2,org = PtCl 6 R 3 NH 2,org + 2Cl - , K ex = 1.9 x 10 3 . The measured distribution coefficients of Pt(IV) agreed well with those calculated in this study.

Solvent Extraction of PtCl<SUB>4</SUB> from Hydrochloric Acid Solution with Alamine336