Extraction of silver from water into nitrobenzene using sodium dicarbollylcobaltate in the presence of valinomycin |
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| Authors: | E Makrlík P Vaňura |
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| Institution: | (1) Faculty of Applied Sciences, University of West Bohemia, Husova 11, 306 14 Pilsen, Czech Republic;(2) Prague Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic |
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| Abstract: | Summary From extraction experiments andg-activity measurements, the extraction constant corresponding to the Ag+(aq) + NaL+(nb)?AgL+(nb) + Na+(aq) equilibrium in the two-phase water-nitrobenzene system (L=valinomycin; aq=aqueous phase, nb=nitrobenzene phase) was evaluated
as log Kex(Ag+,NaL+)=-0.6±0.1. The stability constant of the valinomycin-silver complex in nitrobenzene saturated with water was calculated:
log bnb(AgL+)=4.6±0.1. The stability constants of complexes of some univalent cations with valinomycin were summarized and discussed. |
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