Liquid junction of reference electrode

• US 4,053,382 A
• Filed: 02/06/1976
• Issued: 10/11/1977
• Est. Priority Date: 02/25/1975
• Status: Expired due to Term

• Current Assignee: Horiba Limited
• Original Assignee: Horiba Limited
• Inventors: Watanabe, Masashi, Maruyama, Hiroshi
• Primary Examiner(s): Kaplan, G. L.
• Application Number:
  US05/655,975
• Time in Patent Office: 613 Days
• Field of Search: 204/195 F, 204/195 P, 204/1 H, 204/1 A, 204/195 M, 324/30 R
• US Class Current: 204/435
• CPC Class Codes: G01N 27/40 Semi-permeable membranes or partitions
• CPC Class Codes: G01N 27/401 Salt-bridge leaks; Liquid junctions

Abstract

An improved liquid junction for a reference electrode is provided. It is characterized by forming a hydrophilic layer by treatment of only the surface of a liquid junction of a polymer of tetrafluoroethylene.

Claims

1. In a reference electrode comprising an internal electrode, an internal liquid and a liquid junction structure for separating said internal liquid from a liquid sample to be measured, the improvement wherein said junction structure comprises polytetrafluoroethylene having a hydrophillic layer on the liquid junction surfaces thereof.

2. A reference electrode according to claim 1 wherein the liquid junction is disposed at the base of said electrode.

3. A reference electrode according to claim 1 wherein the liquid junction is disposed at the side wall of said electrode.

4. A reference electrode according to claim 1 wherein the hydrophylic layer is formed by the reaction of sodium on polytetrafluoroethylene.

5. A reference electrode according to claim 4 wherein said reaction is performed in an organic solvent comprising naphthalene.