Porous sorbent material containing fixed ionic sites with a complementary charge to that of the target analyte(s).
Notes: - Ionic or ionizable compounds are extracted almost exclusively from water by electrostatic interactions with ion-exchange sorbents.
- Ion-exchange sorbents are usually classified as weak or strong depending on the identity of the ionic group and whether its charge is independent of the sample \(\rm{pH}\) (strong ion-exchanger) or can be varied by changing the sample \(\rm{pH}\) (weak ion-exchanger).
Source:
PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 542 (https://doi.org/10.1515/pac-2015-0903)