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Electrochemical method for measuring chemical reaction rates

  • US 7,022,217 B2
  • Filed: 07/15/2002
  • Issued: 04/04/2006
  • Est. Priority Date: 07/14/2000
  • Status: Expired due to Term
First Claim
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1. A method for measuring a rate of a chemical reaction between a component of a liquid sample and a reagent, the reaction producing an electroactive species, comprising:

  • providing an electrochemical cell having a working electrode, a counter electrode, and at least one wall, wherein the working electrode and the counter electrode are positioned on substantially the same plane;

    substantially immobilizing the reagent in the electrochemical cell at a site at a minimum distance from the working electrode, wherein the distance is such that transfer of the electroactive species from the site to the working electrode is diffusion controlled;

    placing the liquid sample in the electrochemical cell such that the liquid sample is in contact with the reagent, the working electrode, and the counter electrode;

    reacting the component with the reagent to produce the electroactive species;

    applying a potential between the working electrode and the counter electrode, wherein the potential is sufficient to electrochemically react the electroactive species at the working electrode; and

    measuring the current produced by the electrochemical reaction at the working electrode to obtain a measure of the rate of the chemical reaction.

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