| 摘要 |
A saturated silver/silver halide electrode for measuring electromotive force, e.g. a reference electrode, comprises a conductor 14 with a metallic silver surface and a solid phase 13 of silver halide such as silver chloride and alkali metal halide such as potassium chloride present in sufficient amount to secure that the silver halide and alkali metal halide solution with which the silver conductor is in contact is saturated even at the maximum operation temperature of the electrode, and in which at least 0.1 mole per cent and preferably 0.5-5 mole per cent of the silver halide is reduced to colloidal free silver which is homogeneously distributed in the solid halide. The electrode shows a remarkably reduced sensitivity towards temperature variations and exposure to light. Preferably the weight ratio of alkali metal halide to silver halide is between 10:1 and 1:10. The electrode with porous plug 12 may contact saturated potassium chloride solution inside a reference electrode or glass or other ion selective electrode. <IMAGE> |
