Electrochemical cell
First Claim
1. An apparatus for determining a concentration of a reduced form or an oxidized form of a redox species in a liquid sample, the apparatus comprising:
- (a) a hollow electrochemical cell having a working electrode and a counter or counter/reference electrode wherein the working electrode is spaced from the counter or counter/reference electrode by less than 500 μ
m;
(b) means for applying an electric potential difference between the electrode; and
(c) means for electrochemically determining the concentration of the reduced form or the oxidized form of the redox species in the liquid sample comprising;
(i) means for determining a change in current with time after application of the electric potential difference and prior to achievement of a steady state current;
(ii) means for estimating a magnitude of the steady state current; and
(e) means for obtaining from the change in current with time and the magnitude of the steady state current, a value indicative of the concentration of the reduced form or the oxidized form the redox species.
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Accused Products
Abstract
A biosensor for use in determining a concentration of a component in an aqueous liquid sample is provided including: an electrochemical cell having a first electrically resistive substrate having a thin layer of electrically conductive material, a second electrically resistive substrate having a thin layer of electrically conductive material, the substrates being disposed with the electrically conductive materials facing each other and being separated by a sheet including an aperture, the wall of which aperture defines a cell wall and a sample introduction aperture whereby the aqueous liquid sample may be introduced into the cell; and a measuring circuit.
286 Citations
12 Claims
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1. An apparatus for determining a concentration of a reduced form or an oxidized form of a redox species in a liquid sample, the apparatus comprising:
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(a) a hollow electrochemical cell having a working electrode and a counter or counter/reference electrode wherein the working electrode is spaced from the counter or counter/reference electrode by less than 500 μ
m;
(b) means for applying an electric potential difference between the electrode; and
(c) means for electrochemically determining the concentration of the reduced form or the oxidized form of the redox species in the liquid sample comprising;
(i) means for determining a change in current with time after application of the electric potential difference and prior to achievement of a steady state current;
(ii) means for estimating a magnitude of the steady state current; and
(e) means for obtaining from the change in current with time and the magnitude of the steady state current, a value indicative of the concentration of the reduced form or the oxidized form the redox species. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a concentration of a reduced form or an oxidized form of a redox species in a liquid sample, the method comprising:
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(a) providing a hollow, electrochemical cell having a working electrode and counter or counter/reference electrode wherein the working electrode is spaced from the counter or counter/reference electrode by less than 500 μ
m,(b) applying an electrode potential difference between the electrodes; and
(c) electrochemically determining the concentration of the reduced form or the oxidized form of the redox species in the liquid sample comprising;
(i) determining a change in current with time after application of the electric potential difference and prior to achievement of a steady current;
(ii) estimating a magnitude of the steady current; and
(iii) obtaining from the changes in current with time and the magnitude of the steady state current, a value indicative of the concentration of the reduced form or the oxidized form of the redox species. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification