| 摘要 |
PURPOSE:To reproduce an ion selecting film easily even if the ion selecting film deteriorates by forming the ion selecting film by bringing >=2 ion selecting films of the same kinds into contact, and then separating or peeling one film which comes into contact with a liquid to be measured. CONSTITUTION:In a cylindrical container 11, an internal reference electrode 12 of silver and silver chloride is installed, and the tip of the electrode 12 is dipped in a conductive material 14 such as a KCl solution. An annular projection 16 facing inwardly is provided atop of the container 11, and an ion selecting film part 17 which constitutes part of the container and is opened outward is provided by being supported by said projection. This film part 17 is formed by closely laminating potassium ion selecting films 17a, 17b, and 17c having, for example, 100mum film thickness and obtained by adding poly(vinyl chloride) to valinomycin, and they are peeled off successively from the external film upon occasion. |
