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Method of reducing interferences in an electrochemical sensor using two different applied potentials

  • US 20050183965A1
  • Filed: 10/29/2004
  • Published: 08/25/2005
  • Est. Priority Date: 10/31/2003
  • Status: Active Grant
First Claim
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1. A method of reducing interferences in an electrochemical sensor comprising:

  • applying a first potential to a first working electrode;

    applying a second potential to a second working electrode, wherein said second potential is greater than the absolute value of said first potential;

    measuring a first current, at said first working electrode, which comprises an analyte current and an interfering compound current;

    measuring a second current, at said second working electrode, which comprises an analyte overpotential current and an interfering compound overpotential current, wherein said analyte overpotential current has a first directly proportional relationship to said analyte current and, wherein said interfering compound overpotential current has a second directly proportional relationship to said interfering compound current; and

    calculating a corrected current value representative of an analyte concentration using an equation which is a function of said first current, said second current, said first directly proportional relationship, and said second directly proportional relationship.

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