relative retardation, Rrel

in planar chromatography
https://doi.org/10.1351/goldbook.R05276
A term which is equivalent to relative retention used in
column chromatography
: the ratio of the RF value of a component to the RF value of a standard (reference) substance. Since the mobile phase front is common for the two components, the RF value can be expressed directly as the ratio of the distances travelled by the spot of the compound of interest (bi) and the reference substance (bst) respectively: Rrel=RF(i)RF(st)=bibst In former nomenclatures the symbol Rs was used to express relative retardation in
planar chromatography
. Because of its identity with the symbol for peak resolution the symbol Rrel is suggested for relative retardation in
planar chromatography
.
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 845 [Terms] [Paper]