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Ionic Equilibria of Pt(IV), Pd(II) and Rh(III) in Hydrochloric Acid Solution  

Lee, Man-Seung (Department of Advanced Materials Science & Engineering, Mokpo National University)
Lee, Jin-Young (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.18, no.1, 2009 , pp. 30-37 More about this Journal
Abstract
Distribution diagram of Pt(IV), Pd(II), and Rh(III) in HCl solution was obtained as a function of HCl concentration from 0.001 to 10 M by considering complex formation reaction together with mass balance. When HCl concentration was higher than 0.1 M, most of Pt and Pd in HCl solution exist as $PtCl_6^{2-}$ and $PtCl_4^{2-}$. The concentration of HCl had a feat effect on the speciation of Rh(III). As HCl concentration increases from 0.1 to 10 M, the pedominant species changes from $PhCl_5^{2-}$ to $PhCl_6^{3-}$. Interaction parameters of $PtCl_6^{2-}$ and $PdCl_4^{2-}$ with hydrogen ion were evaluated from the solvent extraction data of Pt and Pd reported in the literature.
Keywords
Pt(IV); Pd(II); Rh(III); HCl; distribution diagram; interaction parameter;
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