Abstract
A study of the distribution coefficients on crystalline antimonic(V) acid (C-SbA) shows an unusual affinity series {Pt(IV)<Au(III)<Pd(II)<<Hg(I), Hg(II), Ag(I)} for microamounts of noble metal ions in nitric acid solution, as compared with ion-exchange resins in strong acid type. Extremely high adsorptive properties are found on the exchange system of Hg(II) and Ag(I), even in relatively high concentrations of nitric acid solution. The ion-exchange studies for macroamounts indicate that a solid solution forms for the system of the Ag(I) ions and hydrogen ions in C-SbA, while two solid phases are presented for the system of Hg(II) ions and hydrogen ions.

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