Ion chromatographic separation of cobalt cyanide complexes

Abstract

An ion chromatographic method for separating various cobalt cyanide complexes is described. The method was developed to study the synthesis of cobalt(III) hexacyanide and to determine the purity of cobalt(III) hexacyanide solutions. Separation of the cobalt cyanide complexes is achieved on an ion-pairing column, followed by chemical suppression and conductivity detection. An application of the method for the determination of radiolabelled cobalt(III) hexacyanide at levels 1000-fold below the detection limit with conductivity detection is described. In this instance, fractions of the effluent are collected and analysed by liquid scintillation counting.