The extraction of Yb(III) and Lu(III) with chloroform from aqueous solutions in the presence of cupferron |
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Authors: | Danuta M Czakis-Sulikowska Natalia Pustelnik |
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Institution: | 1. Institute of General Chemistry, Technical University, PL-90924, ?ód?, Poland
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Abstract: | The equilibrium of distribution of Yb(III) and Lu(III) between chloroform and the aqueous phase in the presence of cupferron (the ammonium salt of N-nitrosophenylhydroxylamine) were studied as apH function of the aqueous phase and the concentration of N-nitrosophenylhydroxylamine (HL). The stability constants for theLnL n 3–n ) complexes (n=1÷3) being formed in the aqueous phase were established, as well as the equilibrium constants of the extraction reaction $$Ln(H_2 O)_m^{3 + } + 3HL_{(O)} \mathop \rightleftharpoons \limits^{K_{ex} } LnL_{3(O)} + 3H^ + + mH_2 O(Ln^{3 + } = Yb,Lu),$$ two-phase stability constants for theLnL 3 complexes,pH 0.5 and the separation factor Lu(III) from Yb(III). |
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