POLAROGRARPHIC DETERMINATION OF THE FORMATION CONSTANTS OF THE MIXED LIGAND COMPLEXES OF CD (II) WITH ITACONIC ACID AND SOME AMINO ACIDS (ASPARGINE AND GLUTAMINE)
Abstract
A polarographic study of Cd(II) with some amino acids and Phthalic acid have been carried out separately at ionic strength kept constant (m = 1) by using KC1 at 298K. The stability constants of Cd(II) with Itaconic acid and some amino acids were determined by the method of DeFord and Hume while the stability constants of mixed-ligand complexes have been evaluated by the method of Schaap & McMaster's. The reduction of the system in each case is reversible and diffusion controlled, involving two electrons. The statistical and electrostatic effects have also been discussed by using these stability constants. The mixing constants (Km) and stabilization constant (Ks) were calculated for comparative study of simple and mixed-ligand complexes.
Keywords: Itaconic acid, electrochemical, mixed-ligand complexes, Polarographic study, reversible reduction and Cd(II).