Process to measure PPB levels of dissolved copper in jet fuels and other non-aqueous fluids using a colorimetric process
US7378281B2 · kind B2 · utility
1Cited by
12References
30Claims
0Family size
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Key dates
| Filing date | Jan 31, 2003 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | May 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring the concentration of metal ions in a sample comprising the steps of: providing a sample comprising a nonpolar, liquid hydrocarbon, suspected of containing a metal ion; adding a dye such as a spirobenzopyran dye or bathocuproine and a reducing agent to the sample; wherein the dye forms a complex with the metal ion; wherein the complex has a spectral shift in light absorbance relative to the dye; observing the spectral shift; and calculating the concentration of the metal ion in the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.