Simplified mathematical description and hydrodynamic characterization to the ionic transport through selective membranes in bi-ionic systems

▸ Diffusion processes in a bi-ionic system were studied in a rotating diffusion cell. ▸ The conductivity and pH values corresponding to the outer solutions were measured. ▸ pH shows a decreasing with time due to the proton transport through the membrane. ▸ Simplified mathematical description for the hydrodynamic characterization of bi-ionic system. ▸ The implementation of the simplified description for the determination of the diffusion coefficients.