A new radiometric titration method based on separation by means of ion exchange

A mathematical expression is derived for the radiocomplexometric determination of a mixture of two metals with one ligand, using an anion exchanger in the solution as a phase separating system. An expression is also given for the complexometric titration of a metal, when formation of acidic or basic complexes is taken into account. In the experimental part titration procedures are proposed for determinations of nickel, copper and iron, using⁶⁵Zn as indicator. The formation of the acidic complex, ZnHY, does affect the radiometric titration curve of zinc with EDTA.