| 摘要 |
PURPOSE:To prolong a storage lifetime of a solid carbon dioxide sensor and to inexpensively manufacture it by a method wherein a layer of a dry residue of hydrophilic macromolecules wherein an electrode is buried and an electrolyte containing acid sodium carbonate, at least, is dispersed is provided between a hydrogen ion sensitive film and a gas permeation film. CONSTITUTION:A dry residue 10 of hydrophilic macromolecules, a hydrogen ion sensitive film 11, an intermediate layer 12 of the hydrophilic macromolecules and a silver/silver chloride electrode 13 are laminated on the side of a gas permeation film 9 being opposite to a flow passage. An electrode 14 for measuring potential is buried in the residue 10. An additive of silicon nitride is used, for instance, for the sensitive film 11 and this is prepared as a macromolecular film by uniform dissolution in a volatile solvent. As to the material of the permeation film 9, polyvinyl chloride is used, for instance. In this constitution, a sample liquid or a standard liquid is introduced sequentially into the flow passage 2 and the partial pressure of carbon dioxide is measured continuously. Since the hydrophilic macromolecules are in a dry state before a sensor is used, water in an electrolytic solution does not evaporate during storage and this a storage lifetime is improved greatly. |
