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pH Measurement device

  • US 4,579,641 A
  • Filed: 06/26/1985
  • Issued: 04/01/1986
  • Est. Priority Date: 06/30/1984
  • Status: Expired due to Term
First Claim
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1. A pH measurement device comprising(A) a working electrode having a linear electrically conductive substrate, at least a distal end surface of which consists of platinum, and a selective hydrogen ion permeable layer formed on the distal end surface of the substrate;

  • and(B) a reference electrode including an electric conductor formed to be insulated from the working electrode and surrounding the working electrode, a polymer-silver (I) complex layer formed on the outer circumferential surface of the conductor, and an ion-conductive layer containing an anionic compound and formed on the complex layer, wherein the pH of a solution is measured in accordance with a potential difference between a potential of the working electrode and that of the reference electrode.

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