The distribution of elements between polyether-type polyurethane foam, cyclic polyethers and hydrofluoric acid solution.
The extraction of fifteen elements in the systems ćonsisting of polyurethane foam (polyether type)/HF-alkali-metal fluoride and cyclic polyether/HF-alkali-metal fluoride has been investigated. Little or no extraction was found for Co, Zn, Fe, Zr, Hf, Sn(IV), Nb, Pa, As(V), Mo, and W. Only Ta, Sb, Re, and Tc are well extracted with either polyurethane foam or dicyclohexano-18-crown-6 in dichloro-ethane under the conditions investigated. The mechanism of the extraction is discussed. The most interesting separation possibilities have been tested.
Caletka
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Sektion Analytik und Höchstreinigung, Universität Ulm, Oberer Eselsberg N 26, D-7900 Ulm/Donau, F.R.G.
Hausbeck
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Krivan
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