DefinePK

Abstract

Data were obtained on the influence of chloride and bromide ion impurities on the extraction of cerium (III) europium (III) and gadolinium (III) with a solution of naphthenic acid in o-xylene from nitrate media. The experiment showed a W-shaped dependence of the distribution coefficient on the Br– content. The nature of the dependence is explained by the formation of non-extractable MeBr2+ and MeOH2+ complexes; the local maximum is associated with an increase in the degree of dissociation of naphthenic acid. The non-monotonous nature of the dependence makes it possible to obtain the effect of anionic synergism and to increase the magnitude of the separation factor of lanthanides in comparison with a nitrate solution by 1.5 times.