Dependence of the mobility of tracer ions in aqueous perchlorate solutions on the hydrogen ion concentration
Abstract
The dependence of the absolute individual ion mobility (AIIM) of the carrier-free radioactive ions [137Cs]Cs+, [201Tl]Tl+ and [57Co]Co2+ on the hydrogen ion concentration in aqueous perchlorate electrolyte mixtures was studied by means of the electromigration technique. The AIIM of the radioactive ions was found to decrease as the hydrogen ion concentration of the electrolyte mixture increases. Above pH > 4 there is a fairly good agreement between experimental and calculated values. Below pH 4 the experimentally observed decrease of the AIIM is not explained by the extended Debye–Hückel–Onsager limiting law. The effect can possibly be explained by a change of the dynamical properties of electrolyte bulk