Solvent extraction of magnesium, zinc and manganese into nitrobenzene by using strontium dicarbollylcobaltate in the presence of valinomycin

From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium M2+(aq)+SrL2+(nb)↔ML2+(nb)+Sr2+(aq) taking place in the two-phase water-nitrobenzene system (M2+=Mg2+, Zn2+, Mn2+; L valinomycin; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Further, the stability constants of the ML2+ complexes in water saturated nitrobenzene were calculated. They were found to increase in the order of Mg2+<Mn2+<Zn2+. (author)