What are extraction techniques?
Extraction techniques separate the analytes from the matrix wherein they exist. The important choices are what technique to use and what solvent system to use with the technique. The benchmark extraction tool for solid matrices is the Soxhlet system. In this technique a solvent mixture is boiled to produce a vapor that is then condensed on a condenser and dripped onto an extraction thimble filled with sample. Once the thimble is filled with solvent, the solvent flushes over into the boiling region and the process repeats. Figure 20 Developments up to the present include accelerated solvent extraction, temperature-pressure-assisted solvent extraction, supercritical fluid extraction, SoxTec extraction, sonication extraction, and shakeout extraction. These techniques have intended to speed up the process while maintaining the excellent recovery figures of Soxhlet extraction and in some cases reduce solvent useage as well as reduce the amount of concentration that is necessary after extrac
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