CHANGE IN PERMSELECTIVITY BETWEEN SULFATE AND CHLORIDE-IONS THROUGH ANION-EXCHANGE MEMBRANE WITH HYDROPHILICITY OF THE MEMBRANE

The transport number of sulfate ions relative to chloride ions through an anion exchange membrane was measured by electrodialyzing a sodium sulfate and sodium chloride mixed solution containing diethylene glyco l after immersing the membrane in diethylene glycol because the membra ne had good affinity to ethylene glycol and diethylene glycol. The tra nsport number of sulfate ions relative to chloride ions increased in t he presence of diethylene glycol in the membrane. This is due to the i ncrease in the uptake of sulfate ions in the membrane compared with ch loride ions, not to the change in a ratio of mobilities of both anions . (C) 1998 Elsevier Science B.V.