IUPAC > Gold Book > alphabetical index > R > relative retardation, R rel in planar chromatography


relative retardation, R rel

in planar chromatography
A term which is equivalent to relative retention used in column chromatography: the ratio of the R F value of a component to the R F value of a standard (reference) substance. Since the mobile phase front is common for the two components, the R F value can be expressed directly as the ratio of the distances travelled by the spot of the compound of interest (b i) and the reference substance (b st) respectively:
R rel = R F i R F st = b i b st
In former nomenclatures the symbol R s was used to express relative retardation in planar chromatography. Because of its identity with the symbol for peak resolution the symbol R rel is suggested for relative retardation in planar chromatography.
PAC, 1993, 65, 819 (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 845
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.R05276.
Original PDF version: http://www.iupac.org/goldbook/R05276.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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