Quantitative determination of major cadmium and zinc content of basic zinc@ alloys ­ comprises separating cadmium and zinc by selective elution on ion exchange resin, breaking up sample, adjusting acidity, retaining cadmium and zinc, etc.

Cadmium and zinc are quantitatively separated by selective elution on ion exchange resin, and the sample is broken up in hot solution containing 1 :1 hydrochloric acid (HCl), to complete dissolution. The acidity is adjusted with HCl (3.5 M) and cadmium and zinc are retained on a quaternary ammonium salt-­type
anionite. Selective elution of zinc and cadmium is carried out, with various molarity HCl solutions and each metal is titrated at controlled pH with sodium-­EDTA in the presence of black eriochromium T.