MA-41 anion-exchange membrane in sodium carbonate/hydrocarbonate solutions

2 ! A modified static method for investigation of CO3 !, HCO3 and OH! ions sorption by anion-exchange membranes

KD — — — — V W — — — zi Dw — — Dissociation constant Ion exchange equilibrium coefficient Mass of membrane sample Number of stages j in experiment k Amount of ion i participating in ion exchange at stage j Amounts of ions produced or consumed during reaction (5) Total amount of ion i sorbed by the membrane in experiment k Volume of solution in the cell Water content, wt% Equivalent fractions of ion i in solution and membrane, respectively Charge number of ion i Water density = 9, is explained by the action of two factors: the Donnan exclusion of protons and electro-selectivity towards multicharged anions in dilute solutions.