Electrophoretic method for the determination of diffusion coefficients of ions in aqueous solutions*

The electrophoretic method was recently developed for the determination of diffusion coefficients of ions in aqueous solution. By solving the Fick's second law in the presence of unlimited media and constant quantity of diffusing species we obtain a relationship between the diffusion coefficient and the standard deviation of the distribution profile. The diffusion coefficients of Cd(II), In(III), Zr(IV), Hf(IV), Pu(VI) and [InDTPA]^2– in nitric acid solution were determined as well as the effective charge of In-DTPA complex at pH 4.50.