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Reference electrode

  • US 5,384,031 A
  • Filed: 11/24/1992
  • Issued: 01/24/1995
  • Est. Priority Date: 04/29/1992
  • Status: Expired due to Term
First Claim
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1. A reference electrode system which provides both a reference half cell electrical potential and a free diffusion liquid junction between a reference half cell and an analytical half cell comprising:

  • (a) a dielectric substrate;

    (b) a reference half cell layer on said substrate;

    (c) an at least partially water soluble hydrophilic wicking material contacting and connecting the reference half cell and the analytical half cell and defining a passage therebetween;

    (d) a dielectric, liquid impermeable barrier layer between the hydrophilic wicking material and the analytical half cell thereby essentially isolating the reference half cell except for a minor portion of the wicking material;

    (e) an aqueous solution contacting and at least in part dissolving the hydrophilic wicking material creating thereby a substantially hollow, free diffusion channel in said passage by replacing dissolved hydrophilic wicking material with a solution containing dissolved wicking material; and

    (f) electrical connection means for connecting the reference half cell to external circuit means.

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