The authors conducted a study on the influence of current density exerted upon the composition of brine. In this study, there was used a cell equipped with three different kinds of ion exchange membranes which had been developed for the electrodialytic concentration of sea water, to measure the amount and specific gravity of brine and the concentration of each ion as well as to calculate the concentration ratio of each ion. The results obtained from this study were summarized as follows:
No influence was exerted on the current efficiency of chloride ion when the current density ranged from 1.2 to 3.2 A/dm
2.
The current efficiency of sodium ion. declined as the current density became lower, and these values were smaller than those of chloride ion. Therefore, the yield of sodium chloride would be determined by the current efficiency of sodium ion.
The concentration ratio of sulfate ion in brine was very low, and it was extremely effected by the kind of membrane and current density.
Bromide ion was concentrated more easily than chloride ion, while potassium ion was concentrated more easily than sodium ion. The degrees of the concentration of calcium ion and magnesium ion were nearly the same as that of sodium ion, but the selective concentration coefficient of these two ions to sodium ion decreased as the current density increased.
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