Abstract
Abstract The rate of the isotopic exchange of Sr2+ between hydrous niobium(V) oxide in the Sr2+ form and aqueous solution of strontium salts was determined radiochemically. The exchange rate was controlled by the diffusion of Sr2+ in the exchanger particles. The diffusion coefficients of Sr2+ and their activation energy changed with the pH in a solution equilibrated with exchangers. Under the conditions of constant pH, the diffusion coefficients were constant up to a certain concentration of Sr2+ (0.1 mol dm−3, pH 7.5), wherefrom they began to increase. The results were considered in terms of the interaction between the ions and the ion-exchange sites by comparing them with the Na+ isotopic exchange rate on this material.
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