Study of alanine-cadmium complexes in water-alcohol mixtures

Alanine complexes of cadmium have been studied polarographically in aqueous and water-alcohol mixtures. A reversible reduction was observed in aqueous and 20% water-alcohol mixtures (i.e. 20% methanol or ethanol) and hence the stability constants were evaluated using Deford and Hume's method while in the case of 40% water-alcohol mixtures (.i.e. 40% methanol or ethanol) the reduction was quasireversible. The formal potentials were obtained by Gellings method. It was found that the decrease in dielectric constant favours greater association of ions resulting in higher value of stability constants. (author)