DETERMINATION OF EQUILIBRIUM-CONSTANTS OF CA(II)-CHELATE, CU(II)-CHELATE, HG(II)-CHELATE AND PB(II)-CHELATE WITH DOWEX A-1 CHELATING RESIN USING ION-SELECTIVE ELECTRODES

A complexation chemistry model is applied for the study of chelating i on exchange systems. A method is presented for the determination of eq uilibrium constants of the metal chelates with the chelating resin Dow ex A-1. It is based on simultaneous pM and pH measurements in optimal pH ranges using ion selective electrodes. Equilibrium constants were d etermined for 1:1 calcium(II), copper(II), lead(II) and mercury(II) ch elates with the resin. Theoretical distribution coefficients were calc ulated as function of pH for respective metal ion resin systems from t he equilibrium constants determined.