| abstract |
A selectively permeable film directly applied to coat the surface of an electroconductive element, said selectively permeable film comprising a polymer which is derived from at least one aromatic compound selected from the group consisting of nitrogen-containing aromatic compounds and hydroxy aromatic compounds. The nitrogen-containing compounds are aniline, 2-aminobenzotrifluoride, 2-aminopyridine, 2,3-diaminopyridine, 4,4 1- diaminodiphenyl ether, 4,4'-methylenedianiline, tyramine, N-(o-hydroxybenzyl)-aniline and pyrrole. The film coated on the electrode surfaces possesses an ability to permit selective passage of ions and the electrode can be used as an ion sensor for measuring the concentration of ion. |