Electro-chemical sensor
First Claim
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1. An electrochemical sensor for measuring an analyte, comprising:
- a first working electrode, wherein the first working electrode comprises a first set of redox species, and wherein the first set of redox species comprises one or more redox species that are sensitive to said analyte;
a second working electrode, wherein the second working electrode comprises a second set of redox species, and wherein the second set of redox species comprises one or more redox species that are insensitive to said analyte;
a counter electrode;
a reference electrode;
means for applying a square wave potential sweep between a first and a second pair of electrodes, wherein the first pair of electrodes comprises the first working electrode and the reference electrode and the second pair of electrodes comprises the second working electrode and the reference electrode; and
means for detecting relative shifts between a first peak and a second peak in a square wave voltammogram, wherein the first peak is produced by one of oxidation and reduction of the first set of redox species and the second peak is produced by one of oxidation and reduction of the second set of redox species.
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Abstract
An electro-chemical sensor is described having one or more redox species sensitive to a certain analyte and one or more redox species that are insensitive to that analyte, for the purpose of making measurements in a downhole environment in aquifers or oilfield reservoirs.
29 Citations
39 Claims
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1. An electrochemical sensor for measuring an analyte, comprising:
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a first working electrode, wherein the first working electrode comprises a first set of redox species, and wherein the first set of redox species comprises one or more redox species that are sensitive to said analyte; a second working electrode, wherein the second working electrode comprises a second set of redox species, and wherein the second set of redox species comprises one or more redox species that are insensitive to said analyte; a counter electrode; a reference electrode; means for applying a square wave potential sweep between a first and a second pair of electrodes, wherein the first pair of electrodes comprises the first working electrode and the reference electrode and the second pair of electrodes comprises the second working electrode and the reference electrode; and means for detecting relative shifts between a first peak and a second peak in a square wave voltammogram, wherein the first peak is produced by one of oxidation and reduction of the first set of redox species and the second peak is produced by one of oxidation and reduction of the second set of redox species. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for measuring a certain analyte, comprising:
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contacting a first working electrode, a second working electrode and a counter electrode with a fluid comprising said analyte, wherein the first working electrode comprises a first set of redox species sensitive to said analyte and the second working electrode comprises a second set of redox species insensitive to said analyte; applying a first square wave potential sweep between the first working electrode and a reference electrode; applying a second square wave potential sweep between the second working electrode and a reference electrode; determining a first potential on the square wave potential sweep, wherein the first potential corresponds to a first peak current flow between the first working electrode and the counter electrode, and wherein the first peak current flow is produced by oxidation or reduction of the first redox species; determining a second potential on the square wave potential sweep, wherein the second potential corresponds to a second peak current flow between the second working electrode and the counter electrode, wherein the second peak current flow is produced by oxidation or reduction of the second redox species; and using the relative separation between the first and second potentials to measure the certain analyte. - View Dependent Claims (39)
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Specification