https://doi.org/10.1351/goldbook.10194
Continuous removal of headspace above a sample by a flow of inert gas over or through the sample until all or a significant portion of the analytes have been removed from the sample. Sample vapours are typically transferred to a sorbent trap or cryogenic trap for collection.
Notes:
- Purge-and-trap is a version of dynamic headspace analysis in which volatile compounds are purged from solution by a continuous stream of gas bubbles (sparging gas) and transported through the headspace to a sorbent or cryogenic trap for collection.
- A typical apparatus for purge-and-trap is shown in the figure below.
Typical apparatus for analysis by dynamic headspace (purge and trap). The gas flow (sparging gas) enters at the bottom of the sample container transporting volatile compounds through the headspace and purge head to the desorption tube for collection.
Source:
PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 528 (https://doi.org/10.1515/pac-2015-0903)
PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 528 (https://doi.org/10.1515/pac-2015-0903)