Abstract
The distribution of Zn(II) between aqueous sulfate solutions and n-dodecane solutions of bis-(2-ethylhexyl)-phosphoric acid (D2EHPA) has been measured in the range of an initial aqueous Zn(II) concentration from 1.5 × 10 −3 to 1.5 × 10 −1 M. The ionic strength I, for several experiments carried out, was adjusted to a constant value by using Na 2SO 4, for I=0.1−3. The data obtained were used to find a way of calculating the equilibrium distribution over a large concentration range. In this case, for the chemical reaction between the reactive extractant D2EHPA and the bivalent metal cation Zn (II), the stoichiometry changes from 2 to 1.5 for high D2EHPA loading conditions. A model was developed, based on the law of mass action, which enables the prediction of extraction equilibria for a given system over a large range of parameters such as ionic strength, pH, D2EHPA and zinc concentrations for known initial concentrations of the components of the system.
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