Electrochemical analysis is considered to be applicable to the transport phenomena across a membrane which accompanies ionic reactions in the system where two solutions on both sides of the membrane are acidic and basic, respectively. Transport of halide ions across poly (vinylpyridine-
co-styrene) membranes was analyzed by measuring the time dependence of the membrane resistance and bi-ionic potential. As a result, it becomes clear that poly (2-vinylpyridine-
co-styrene) membranes are permselective for Cl
- because HCl forms more easily pyridinium salt than HBr, and also that poly (4-vinylpyridine-
co-styrene) membranes are permselective for Br
- because the mobility of Br
- is higher than that of Cl
- in the membranes.
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