The chromatographic bed used in @T06346@ in which there is a gradual transition in some property.
Source: PAC, 1993,
65, 819. (
Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 830 [
Terms] [
Paper]
See also: Orange Book, 2
nd ed., p. 98 [
Terms] [
Book]