ELECTRODIALYSIS SEPARATION OF NA-MODE( AND CA2(+) IN A PULSED CURRENT)

Electrodialysis separation of Na+ and Ca2+ cations has been studied in the pulsed current mode on a cation-exchange membrane of the MK-40 ty pe and on a reversely osmotic membrane of the MGP type. It is shown th at the use of the pulsed current offers possibilities for controlling the membrane ion-transport selectivity by changing parameters of the p ulsed mode. It is noted that the range of the membrane ion-transport s electivity in the pulsed mode is not wider than that under galvanostat ic conditions. The frequency dependences of the separation coefficient s of ions and ionic fluxes through the membrane under experimental con ditions are found to display no resonances.