RETENTION BEHAVIOR OF TRANSITION-METAL IONS WITH SOME COMPLEXING AGENTS ON CATION-EXCHANGER

Prediction of retention times in transition metal-mandelate and transi tion metal-tartrate complex systems were studied on the cation exchang er. Plots of k' vs [mandelate] and k' vs [tartrate] were obtained unde r the condition of a constant competing cation concentration. The equa tion to predict the retention time of transition metal ion was derived from the ion exchange equilibria. Individual capacity factors (k1', k 2') and stability constants (K1, K2) of the complexes were calculated from the non-linear least square method. Good resolution of the transi tion metals was predicted by the stepwise equation in the gradient met hod. The values of retention times from the calculation and the experi ment agreed well each other.