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Polarographic chemical sensor with external reference electrode

  • US 5,078,854 A
  • Filed: 01/22/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 01/22/1990
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring the concentration of a chemical species dissolved in an ion containing sample liquid, said apparatus including:

  • A) a reference electrode in electrical communication with the sample liquid;

    B) a working electrode comprising;

    an electrical conductor having a portion thereof electrochemically active with the dissolved species;

    C) means for measuring the flow of electrical current between the working electrode and the reference electrode; and

    D) a continuous, hydrophobic membrane, permeable to both said dissolved species and to the ion contained in said liquid, said membrane having an electrical resistance lower than the electrical resistance of the electrical conductor of the working electrode and the means for measuring the flow of electrical current, said membrane, disposed so as to separate the active portion of the working electrode from the sample liquid and from the reference electrode.

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