Column extraction chromatography of non-volatile platinum metals.
Mixtures of Pd(II)-Pt(IV)-Ir(IV) and of Rh(IV)-Pd(II)-Pt(IV)-Ir(IV) have been separated by column chromatography on silica treated with a tri-n-octylammonium salt, by three-step elution with mixtures of hydrochloric acid (2.25M). The optimal conditions for separation were identified from preliminary paper-chromatographic data and the results of column experiments for the individual metals. Single bands for each non-volatile platinum metal were found for the proposed chromatographic system and satisfactory recoveries of single metals from mixtures were obtained. The simple method proposed requires only one column for the separation, which can be repeated at least three times on the same column. The separation needs about 2 hr elution time.
Przeszlakowski
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Department of Inorganic and Analytical Chemistry, Medical School, 20-081 Lublin, Poland.
Flieger
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