Extraction of some univalent cations into nitrobenzene by using a synergistic mixture of sodium dicarbollylcobaltate and barium ionophore I |
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Authors: | E Makrlík P Vaňura |
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Institution: | 1.Faculty of Applied Sciences,University of West Bohemia,Pilsen,Czech Republic;2.Department of Analytical Chemistry,Institute of Chemical Technology,Prague 6,Czech Republic |
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Abstract: | From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium
M+ (aq) + 1·Na+ (nb) ⇔ 1·M+ (nb) + Na+ (aq) taking place in the two-phase water–nitrobenzene system (M+ = Li+, H3O+, NH4 + {\rm NH}_{4}^{ + } , Ag+, K+, Rb+, Tl+, Cs+; 1 = barium ionophore I; aq = aqueous phase, nb = nitrobenzene phase) were determined. Furthermore, the stability constants
of the 1·M+ complexes in water-saturated nitrobenzene were calculated; they were found to increase in the series of Cs+ < Rb+ < NH4 + {\rm NH}_{4}^{ + } , K+ < H3O+ < Na+ < Ag+, Tl+ < Li+. |
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