| 摘要 |
1,144,998. Electro-chemical measurements. ORION RESEARCH Inc. Feb.15, 1968 [March 9, 19671, No.7520/68. Heading G1N. A combined reference half cell and ion sensitive measuring cell comprises a double walled container composed of a transparent outer shell 20, Fig. 1, e. g. of PVC or PTFE, and an opaque inner tube 22, e. g. of epoxy plastic, whose lower ends are provided with complementarily tapered mating surfaces, roughened to provide a leak structure between an external sample and a reference electrolyte 54, e. g. saturated KC1, contained in the space between the shell 20 and tube 22. The reference electrode 52 is formed by a silver-silver chloride layer on the outer surface of tube 22. The bottom surface of the container is planar and provided centrally, with a recess 34 into which an ion sensitive membrane 36 is cemented. The membrane forms the bottom closure of tube 22 containing an electrolyte 60, e. g. of aqueous AgNo 3 , in which a hollow tubular electrode 58 is immersed. The structure may be used to measure the salt concentration of sweat on the skin in the diagnosis of cystic fibrosis, the planar end of the structure being held against the patient's skin. The ion sensitive membrane may be formed of a bromide, chloride or sulphide in a quasi-morphous, or highly compressed polycrystalline form, or of a monocrystal of a rare earth fluoride for sensing fluoride ions. It may also be formed of a glass sensitive to hydrogen, sodium or potassium ions or of a liquid ion exchange material held in a inert porous substrate. |
