WO42-was in competition with Cl- on migration , It can retard the migration of Cl- effectively above a certain concent ration , The higher the concentration , the more efficient it is.

• 闭塞区内WO42-离子浓度随主体溶液中WO42-离子浓度的增加而增大。对一定浓度WO42-的主体溶液,WO42-离子向闭塞区的迁移量随时间延长而增大,迁移速率则随时间的延长而降低。