IUPAC > Gold Book > alphabetical index > R > retardation factor, R F in planar chromatography


retardation factor, R F

in planar chromatography
Ratio of the distance travelled by the centre of the spot to the distance simultaneously travelled by the mobile phase:
R F = b a
By definition the R F values are always less than unity. They are usually given to two decimal places. In order to simplify this presentation the h R F values may be used: they correspond to the R F values multiplied by 100. Ideally, R F values are identical to the R values used in column 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.R05353.
Original PDF version: http://www.iupac.org/goldbook/R05353.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 The PDF version is out of date and is provided for reference purposes only.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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