Ion-exchange resins containing s-bonded dithizone and dehydrodithizone as functional groups : Part 2. Desoprtion properties and development of separation procedures for gold and platinum group metals |
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Authors: | M. Grote A. Kettrup |
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Affiliation: | University of Paderborn, Dept. Chem., Applied Chemistry, P.O. Box 1621, D-4790 Paderborn Federal Republic of Germany |
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Abstract: | The desorption of precious metals from the PD and PTD ion-exchange resins, containing S-bonded dithizone and dehydrodithizone as functional groups, is described. Each sorbent was loaded batchwise with individual or combined metals and then treated with excess of various extracting agents (6 M hydrochloric acid, 2 M perchloric acid, ammonium nitrate, sodium thiocyanate, thiourea). Strong retention of some adsorbed metals and instability during the loading and elution stages were found with the PD resin, but a selective separation of palladium and gold from accompanying metals was possible. The PTD resin had superior properties. Unsual effects were detected when elution rates were compared for individual metals and mixtures. While Pd and Pt, loaded individually, were desorbed quantitatively by thiourea, co-extracted Ir(IV) completely inhibited their elution. The regeneration of PTD by special sequences of eluents was utilized for selective chromatographic separation of Pd, Pt, Os, Au and (with restrictions) Ir from each other and also from large amounts of base metals and salts. |
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