Retention volume of a sample component, the molecules of which are smaller than the largest pores of the particles of the stationary phase but larger than the smallest pores.
Note: The corresponding retention time is related to the retention time (in size-exclusion chromatography) (\(t_{\rm{R}}\)) and the flow rate (\(F_{\rm{c}}\)) by \(V_{\rm{R}} = t_{\rm{R}} \times F_{\rm{c}}\).
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 212 (https://doi.org/10.1515/pac-2017-0111)