Abstract
In this paper, the influence of the chloride concentration in the aqueous phase on the distribution and separation of zinc and cadmium is studied. We have found that with both acids studied (naphthenic and Versatic 911 *), increased chloride concentration in the aqueous phase results in decreased distribution coefficients of both metals. As the distribution of cadmium is decreased to a greater extent than the distribution of zinc, the separation factor is seriously affected by change in chloride concentration. With naphthenic acid, the separation factor increases continuously with increasing chloride concentration; with Versatic acid 911 a maximum in the separation factor-chloride concentration curve is found at about 2 molar NaCl. In all cases studied, the obtained separation factors are greater when Versatic acid 911 is used instead of naphthenic acid.
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