Electrochemical pH measurement
US9244034B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2012 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Feb 2, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4167
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring pH of aqueous liquid with little or no buffer present uses an electrochemical pH sensor which comprises a plurality of electrodes with a redox active organic compound attached to an electrode and having at least one functional group convertible electrochemically between reduced and oxidized forms with transfer of at least one proton between the compound and surrounding aqueous phase, wherein the compound has at least one substituent group which promotes hydrogen bonding at a said functional group and thereby increases the reaction rate of proton transfer. The substituent group may form an internal hydrogen bond with a redox-convertible group or may enhance polarity to promote electrostatic interaction with water molecules and reduce activation energy. Such an electrochemical sensor may be used for pH measurement in computer controlled equipment for processing an aqueous liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.