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  • 1 Universität Ulm Sektion Analytik und Höchstreinigung Oberer Eselsberg, N 26 D-7900 Ulm/Donau (FRG)
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The sorption of niobium and tantalum on Dowex-1 and open-cell polyurethane foam polyether-type in HF–H2SO4 and HF–HCl medium has been investigated. The mechanism of the sorption as well as the composition of adsorbable complexes is discussed. A selective adsorption of tantalum was achieved from solutions, in which the concentration range of HF was 0.05–2M, of H2SO45M and of HCl4M. The most interesting separation possibilities have been tested under dynamic conditions.