Total organofluorine method for PFAS using reductive defluorination
US11774414B2 · kind B2 · utility
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Key dates
| Filing date | Oct 5, 2021 |
| Grant date | Oct 3, 2023 |
| Priority date | — |
| Expiry date | Mar 26, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/8845
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of determining total organofluorine in a sample comprising PFAS, comprising: providing a solution of PFAS in an organic solvent to obtain extracted PFAS, or extracting a sample with an organic solvent to obtain extracted PFAS; treating the extracted PFAS with a sodium metal dispersion and alcohol to obtain sodium fluoride; and quantifying the amount of the fluoride. Surprisingly, we discovered that the method recovered substantial fluorine from PFAS and significantly higher yields obtained by selection of the appropriate alcohols. The method is selective for organofluorine from inorganic fluorine.
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