Exclusion chromatography in which ionized compounds are excluded from the pores of the support and elute first, while weakly ionized and non-ionic compounds elute later.
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 187 (https://doi.org/10.1515/pac-2017-0111)