Transport in aqueous solutions of group IIB metal salts (298.15 K). Part 3.—Isotopic diffusion coefficients for cadmium-115 ions in aqueous cadmium iodide

Abstract

Cadmium isotopic diffusion coefficients (D_aa) were determined in aqueous cadmium iodide in the concentration range 0.1–0.6 mol dm^–3. D_aa passes through two maxima, one below 0.1 mol dm^–3, the other at 0.4 mol dm^–3. Irreversible thermodynamic analysis shows that these maxima are due to positive fluctuations in the isotope-to-isotope coupling contributions to D_aa. For these studies a modified diaphragm cell technique was developed.