Membrane extraction with a sorbent trap for concentration of the permeate.
Note: MESI is typically used in a system consisting of three components: (1) membrane extraction module; (2) sorbent interface; and (3) gas chromatograph. A flow of gas is used as the stripping phase to transfer permeate to the sorbent trap for concentration and thermal desorption into the gas chromatograph.
Source:
PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 550 (https://doi.org/10.1515/pac-2015-0903)