Substoichiometric extraction of tantalum with diantipyrylmethane |
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Authors: | R Caletka V Krivan |
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Institution: | Sektion Analytik und Höchstreinigung, Universität Ulm, D-7900 Ulm-Donau West Germany |
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Abstract: | Diantipyrylmethane is used for substoichiometric extraction of tantalum from 1—4M hydrofluoric acid into 1,2-dichlorethane. The selectivity of the method is good, niobium and antimony(V) being the main inteferences. The stoichiometric composition of the tantalum/diantipyrylmethane complex is 1:1. The method was usef for the determination of trace amounts of tantalum (0.52 ± 0.05 μ g?1) in a lake sediment (Bodensee/Lake Constance) by neutron activation/μ-spectrometry. Tantalum was determined in niobium samples by an isotope dilution procedure after separation of the matrix on a polyurethane foam column loaded with diantipyrylmethane. |
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