抄録
Reverse electrodialysis（RED）is a process that can generate electric power from salinity gradients. For practical operation of a RED system, the influence of multivalent ions in the feed solutions for the system should be examined. In this study, in order to evaluate the effect of divalent ions on the RED performance more quantitatively, we have evaluated the relationship between the cation concentration in a cation exchange membrane（CEM）and molar fraction of divalent ions in a mixed solution of NaCl and MgSO 4 . As predicted from the Donnan equilibrium theory, the partition coefficient of Mg ions in the CEM was higher than that of Na ions. It indicates that the increase of membrane resistance in the mixed solution will be mainly due to the increase in the concentration of Mg ions with low ionic mobility in the CEM.
