https://doi.org/10.1351/goldbook.10229
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.