Weak solvent used to displace matrix components from a sorbent without displacing the target analyte(s).
Note: An optional step, intermediate between sample application and elution.
Source:
PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 544 (https://doi.org/10.1515/pac-2015-0903)