Use of a supercritical fluid to extract analytes from a solid or supported liquid sample.
Notes: - The powdered sample, or supported liquid, is packed into a vessel and extracted using static or dynamic extraction conditions. The extracted material is typically recovered by reducing the pressure of the extraction fluid, allowing it to evaporate.
- The most common supercritical fluid for extraction is carbon dioxide (critical point = \(\pu{39.9^{\circ}C}\) and \(\pu{73.8 bar}\)). Its extraction properties are varied by changing its density (temperature and pressure) or by addition of polar organic solvents.
Source:
PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 538 (https://doi.org/10.1515/pac-2015-0903)