Abstract
In our previous study, we carried out the electrodialytic concentration of sea water using ionexchange membrane, and as the result we found that the concentration of some cations contained in the brine did not indicate its normal tendency. This was considered to have been brought about by the chlorine added to the sea water for sterization.
In our present study, therefore, we used the sea water containing no chlorine and measured the concentration of each ion contained in the brine in the same way as in our previous study. As the result, we obtained appropriate values of permselectivities for characteristic cation exchange membrane, and the values of permselectivity coefficients Ca2+ and Mg2+ to Na+ were about 0.6 times as much as those of usual cation exchange membrane.
