| abstract |
(57) [Summary] [Objective] The permeability of bromine ions is reduced and the permeability of nitrate ions is improved by an electrodialysis method using an ion exchange membrane, and these ions are removed and concentrated. [Structure] During electrodialysis of an aqueous solution containing bromine ions and / or nitrate ions, polypyrrole is added to an anion exchange membrane substrate at, for example, 0.01 to 2 mg / cm 2 -dr. The composite membrane existing in the range of the y membrane is used. |