Reference electrode and method of making same
US4913793A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1986 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Jan 6, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/301
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A reference electrode, optionally in combination with a measuring electrode to form a combination electrode, is disclosed in which the salt bridge comprises anionic and cationic ion exchange polymer. This polymer may be a diaphragm forming the liquid junction structure of the reference electrode. Polymer is preferably a mixture of anionic and cationic ion exchange polymer which may be either water insoluble or water soluble and is preferably converted to a form which binds equitransferent ions. When the polymer is substantially insoluble, a water-soluble thickener polymer may be incorporated in the polymer composition. Methods of measuring pH using the electrodes of the invention are also disclosed, particularly in high purity deionized water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.