On the Stability of the Acetate, Glycolate and Thioglycolate Complexes of Tervalent Europium and Americium.

Abstract

Stability constants for the acetate, glycolate, and thioglycolate complexes of tervalent europium and americium were determined in a perchlorate medium of the ionic strength I = 0.5 M and at a temperature of 20.0 °C, The europium complexes were studied by a potentiometric method and the americium complexes by a cation exchange method. Quantitative results for the acetate and glycolate systems were checked by an anion exchange study. In all the systems investigated the americium complexes were stronger than the corresponding europium complexes. The difference was most pronounced for the glycolate systems. For both europium and americium the stability constants of the complexes decreased in the following order: glycolate, acetate, and thioglycolate.