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Transition metal ion-H + exchanges on Nafion 117 membrane (pre-treated differently prior to use), Dowex 50W×4 and Dowex 50W×8 resins have been studied. The water sorption isotherms of these exchangers in different ionic forms generated over the entire range of water activity have been analyzed by the D’Arcy and Watt equation (DWE). The results show that the physical structure of the exchangers...
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