| 摘要 |
PROBLEM TO BE SOLVED: To obtain a reference electrode which is compact, which is handled and stored easily, which can be used at a high temperature, whose impedance is low and which does not contain an internal liquid. SOLUTION: A plurality of capillaries 4 which are composed of an ion-conductive silica-based sodium-based or lithium-based glass are bundled. Sides, on one side, of the bundled capillaries 4 are connected electrically by a conductor 5. A lead wire 6 for reference-potential derivation is connected to the conductor 5. Thereby, a reference electrode which does not contain an internal liquid is constituted. When the reference electrode which is constituted in this manner is immersed in a sample, the sample creeps into the capillaries 4 and into gaps between the capillaries 4 due to a capillary phenomenon. When the capillaries 4 are composed of the sodium-based glass, hydration layers which are rich in Na<+> with reference to bulk H<+> are formed on sample liquid contact faces on inner faces and outer faces of the capillaries 4. When the capillaries 4 are composed of the lithium-based glass, hydration layers which are rich in Li<+> with reference to bulk H<+> are formed on sample liquid contact faces on the inner faces and the outer faces of the capillaries 4. An electromotive force is generated in the hydration layers, and it is taken out to the lead wire 6 as a reference potential. |
