retardation factor, R 

in column chromatography
https://doi.org/10.1351/goldbook.R05352
The fraction of the sample component in the mobile phase at equilibrium; it is related to the retention factor and other fundamental chromatography terms: R=1k+1
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 843 [Terms] [Paper]
Citation: 'retardation factor' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.R05352 RIS BibTex EndNote
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Last revised: February 24, 2014