modified active solid

in chromatography
https://doi.org/10.1351/goldbook.M03962
An active solid the sorptive properties of which have been changed by some treatment.
Sources:
Orange Book, 2nd ed., p. 98 (http://media.iupac.org/publications/analytical_compendium/)
PAC, 1993, 65, 819. 'Nomenclature for chromatography (IUPAC Recommendations 1993)' on page 830 (https://doi.org/10.1351/pac199365040819)