Abstract

From extraction experiments and c-activity measurements, the exchange extraction constants corresponding to the general equilibrium M(aq) ? Sr(nb) ¢ M(nb) ? Sr(aq) taking part in the two-phase water– nitrobenzene system (M = Mg, Ca, Ba, Cu, Zn, Cd, Pb, UO2þ 2 , Mn , Fe, Co, Ni; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Furthermore, the individual extraction constants of the M cations in the mentioned two-phase system were calculated; they were found to increase in the following cation order: UO2þ 2 \ Zn , Ni \ Cu, Cd \ Co \ Mg \ Ca \ Mn, Fe \ Sr \ Pb \ Ba.

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