The kinetics of Na+–UO
ion exchange on strongly acidic cation exchangers in a batch stirred reactor has been studied. The exchangers Ostion KS (containing DVB in the range of 1.5–12%) and Amberlite IR 120 for experimental work were used; the concentration of the aqueous nitrate solution was always 0.2 mol·l–1. The Nernst-Planck equation was applied for description of ion diffusion in the particle. The diffusion coefficients of UO
ions in the exchangers and their dependence on the content of DVB were obtained by evaluating the experimental data.