Method and apparatus for assay of electrochemical properties
First Claim
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1. A method for determining effective electrode area in an electrochemical test cell containing a liquid sample, wherein the electrochemical test cell comprises two electrodes and the effective electrode area is the area of the electrodes that is in contact with the liquid sample, said method comprising:
- applying a potential stimulus to the electrodes to generate a current signal, the potential stimulus comprising a time-varying potential component superimposed on a constant potential component;
isolating a time-varying current component from the current signal;
determining a phase angle of the time-varying current component relative to the time-varying potential component;
using the phase angle to separate the time-varying current component into a real component and an imaginary component, the magnitude of the imaginary part being related to the effective electrode area; and
determining effective electrode area from the determined magnitude of the imaginary part of the time-varying current component.
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Abstract
A method for monitoring a select analyte in a sample in an electrochemical system. The method includes applying to the electrochemical system a time-varying potential superimposed on a DC potential to generate a signal; and discerning from the signal a contribution from the select analyte by resolving an estimation equation based on a Faradaic signal component and a nonfaradaic signal component.
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8 Claims
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1. A method for determining effective electrode area in an electrochemical test cell containing a liquid sample, wherein the electrochemical test cell comprises two electrodes and the effective electrode area is the area of the electrodes that is in contact with the liquid sample, said method comprising:
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applying a potential stimulus to the electrodes to generate a current signal, the potential stimulus comprising a time-varying potential component superimposed on a constant potential component; isolating a time-varying current component from the current signal; determining a phase angle of the time-varying current component relative to the time-varying potential component; using the phase angle to separate the time-varying current component into a real component and an imaginary component, the magnitude of the imaginary part being related to the effective electrode area; and determining effective electrode area from the determined magnitude of the imaginary part of the time-varying current component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification