| 摘要 |
PURPOSE:To obtain a small H<+> sensor with a high safety, by arranging an H<+> selectively permeating film on the aqueous solution side of a conductor which generates a potential according to H<+> concn. in an aqueous solution to be measured and a first electrode, a solid electrolyte and a second electrode in the order in contact with a hydrophobic porous membrane on the opposite surface thereto. CONSTITUTION:A platinum thin film is provided on the solution 33 side of a porous membrane 12 made of a high polymer containing F or the like as conductor 11 which generates a potential according to H<+> density in an aqueous solution 33 to be measured to form an H<+> selectively transmitting membrane 13 on the membrane 12. A first electrode 14, a poly high molecular electrolytic membrane 15 (quaternary vinylpyridine) 15, a second electrode membrane 16 are formed in the order on the side opposite to the solution 33 of the membrane 12. A DC power source 20 is connected to the electrodes 14 and 16 through leads 19a and 19b and the conductor 11 and a reference electrode 34 are connected to a potential difference meter 35. With such an arrangement, direct current is applied between the electrodes 14 and 16 to generate H on the electrode 14 by decomposing water in a measuring atmosphere. H thus generated is fed to the surface of the membrane 12 to eliminate an accessary equipment for the supply of hydrogen gas thereby providing a small H ion concn. measuring sensor with a high safety because of very limited hydrogen to be generated. |
