Reference electrode solution containing organic ammonium and phosphonium salts for potentiometric measurement of pH
US6221222A · kind A · utility
9Cited by
16References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1998 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Dec 3, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/301
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a reference electrode solution containing ammonium salts and phosphonium salts for the potentiometric measurement of pH and method of using the same. The use of the ammonium salts and the phosphonium salts to replace potassium chloride or sodium chloride as reference electrolytes in a standard reference electrode minimizes the formation of precipitates in sample solutions containing cation-sensitive compounds. Disruption of ion flow through the reference electrode is eliminated, and accurate pH measurements may be obtained in solutions that contain compounds having a strong affinity for hard cations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.