SPECIATION STUDY ON THE ION EXCHANGE EXTRACTION OF SILVER, COPPER, IRON AND ZINC CYANO COMPLEXES WITH AN ITERATIVE SLOPE ANALYSIS TECHNIQUE.

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Abstract
A slope analysis technique was developed and applied to the study of various equilibrium distribution isotherms in order to determine the speciation involved in the ion exchange. The slope analysis technique consisted of a computer iterative procedure to estimate the equilibriura resin composition and the introduction of ‘macro’ concentrations of a foreign anion to induce limiting conditions. The results indicate that, under the experimental conditions and with tht resi.is studied, both copper and ziac are extracted mainly as bivalent ions. Evidence was found that iron is extracted as a tetravalent ion whereas silver appears to be extracted as a mixture of mono- and bivalent ions.

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