modified active solid

in chromatography
https://doi.org/10.1351/goldbook.M03962
An @A00109@ the sorptive properties of which have been changed by some treatment.
Sources:
Orange Book, 2nd ed., p. 98 [Terms]
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 830 [Terms] [Paper]