Electrochemical Studies on Mixed-Ligand Complexes of Cd(II) With Itaconic Acid and Some Amino Acids

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A polarographic study of Cd(II) with some amino acids and Itaconic acid have been carried out separately at ionic strength kept constant (μ = 1) by using KCl at 298K. DeFord and Hume’s method is used to calculate the stepwise formations constants of simple systems (Cd-amino acids and Cd-Itaconic acid) while the stability constants of mixed complexes have been evaluated by the method of Schaap & McMaster’s. The reduction of Cd(II) ion is found to be reversible and diffusion controlled involving two electrons in each case. The statistical and electrostatic effects have also been discussed by using these stability constants. The mixing constant (Km) and stabilization constant (Ks) were measured for comparative study of simple and mixed ligand complexes.

Amino acids; Itaconic acid; Cd(II); mixed ligand complexes; reversible reduction; polarographic study