| 摘要 |
PURPOSE:To lengthen the life of an electrode and reudce the time of replacing it for a new one which involves difficult work and reduce high cost of ion selective films by providing in an ion selective electrode a mechanism to supply automatically a plastic agent to an iron selective film. CONSTITUTION:An ion selective film 26 that consists of a sheet formed by impregnating a high molecule film such as PVC, etc. with a hydrophobic neutral carrier (crown ether group, Valinomycin, etc.) and a plastic material such as dioctyl phthalate, etc. is airtightly attached on the cylindrical wall 27 at the opening 22 at the bottom of a cylindrical electrode body 21. The solution 24' of a material such as KCL, etc. that is electricity conductive by ionization and an internal standard electrode are put in a first chamber 24 that includes the opening 22. A first chamber 24 is divided from a second chamber 25 by a partition 23 air-tightly. A third chamber 28 is formed annularly over the whole of the bottom periphery of the first chamber 24 by means of film 26 and wall 27 and a wall 29 or a plurality of third chambers 28 through the wall 27 connects the chamber 25 and the chamber 28, and the opening section to the second chamber 25 is closed tightly with a film 31 impermeable to plastics. A plastic material 28' is sealed into the chamber 28. When the electrode is submerged in a specimen such as blood serum for a long time, the plastic material is supplied automatically to the film 26 with this arrangement and the life of the electrode is made long. |
