Patent EP0333246A2 successfully refreshed from Google Patents.
EP0333246A2
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EP
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Electrochemical sensor and method
Assignee: Unilever PLC
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Filing: 1989-03-03
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Granted: —
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Expires: 2009-03-03
Abstract
Abstract There is provideda method of determining concentration of an oxidisable or reducible chemical species, especially of percarboxylic acids, in a solution, which comprises determining flow of current in a circuit containing an electrode immersed in a test solution but covered by a porous insulator directly superimposed on the electrode and separating the electrode from direct contact with the test solution. Furthermore, an electrochemical sensor for carrying out the method is provided, comprising one or a plurality of electrodes in the form of areas of metal-containing layer on an insulating substrate, with at least one of the electrode areas covered by a porous insulator directly superimposed thereon.
Inventors
- 👤 Brian Jeffrey Birch
- 👤 Clive Edward Marshman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:10
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/49
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A method of determining concentration of an oxidisable or reducible chemical species in a solution, comprising determining flow of current in a circuit containing an electrode immersed in a test solution but covered by a porous insulator directly superimposed on the electrode and separating the electrode from direct contact with the test solution.
Claim 2
Independent Claim
53 words
A method of determining concentration of an oxidisable or reducible chemical species in a solution, comprising determining flow of current in a circuit containing an electrode immersed in a test solution but covered by a porous insulator directly superimposed on the electrode and separating the electrode from direct contact with the test solution.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein the said electrode is maintained at a predetermined potential relative to a reference electrode in contact with the solution.
Claim 4
Independent Claim
32 words
A method according to any one of the preceding claims, carried out with a sensor providing the said electrode covered by a porous insulator, and a counter electrode, on a common substrate.
Claim 5
Independent Claim
82 words
A method according to any one of the preceding claims, wherein the method comprises exposing three electrodes to a solution containing the species to be determined, the said electrodes being a reference electrode, a counter electrode and a working electrode covered by a said porous insulator, applying a potential difference to counter and working electrodes and regulating the potential difference to maintain a predetermined potential difference between the reference electrode and the working electrode, and determining the current at the working electrode.
Claim 6
Dependent Claim
19 words
A method according to claim 4, further compriaing deriving a voltage signal representing the current at the working electrode.
Claim 7
Independent Claim
19 words
A method according to any one of the preceding claims, employed for measuring the concentration of a percarboxylic acid.
Claim 8
Dependent Claim
38 words
An electrochemical sensor comprising one or a plurality of electrodes in the form of areas of metal-containing layer on an insulating substrate, with at least one of the electrode areas covered by a porous insulator directly superimposed thereon.
Claim 9
Dependent Claim
38 words
An electrochemical sensor comprising one or a plurality of electrodes in the form of areas of metal-containing layer on an insulating substrate, with at least one of the electrode areas covered by a porous insulator directly superimposed thereon.
Claim 10
Dependent Claim
28 words
A sensor according to claim 7, having two electrode areas in which the metal is gold, with an insulating porous layer over at least one said electrode area.
Claim 11
Dependent Claim
24 words
A sensor according to claim 7 or claim 8, having a further metal-containing area layered on said substrate and which provides a resistance thermometer.
Claim 12
Dependent Claim
28 words
A sensor according to claim 7 or claim 8, having areas containing dissimilar metals layered onto said substrate and in contact with one another to form a thermocouple.
References Cited (Backward Citations)
No citation records indexed.
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