Summary
It is demonstrated that although the RF values are directly related to the separations obtained, the RM values are more convenient in the theory of optimization of chromatograpohic systems. Graphs for direct plotting of RF values in the RM scale are shown in both logarithmic and linear solvent composition scale. The effects of preadsorption of the solvent vapours and of simultaneous partition betwen the mobile and the stagnant developing solvent on the retention vs. compostion plots are illustrated. Examples are shown for crossing retentions vs. solvent composition plots.
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Abbreviations
- a:
-
constant in eq. (6)
- b:
-
slope of eq. (6)
- c:
-
conentration of the polar compound in the mobile phase
- k′:
-
capacity factor
- k′ads :
-
capacity factor due to adsorption
- k′part :
-
capacity factor due to liquid-liquid partitioni
- K:
-
distribution constant, partition coefficient
- mads :
-
weight of adsorbent; mads/VM-phase ratio
- n:
-
slope of eq. (1)
- nc :
-
number of carbon atoms in the alkyl radical of dialkyl phthalates (Fig. 2)
- RF :
-
retardation factor
- hRF :
-
h RF=100 RF
- R′F :
-
R′F=ζRF
- RM :
-
\(R_M = \log \frac{{1 - R_F }}{{R_F }} \simeq \log k'\)
- R′M :
-
\(R'_M = \log \frac{{1 - R'_F }}{{R'_F }} \simeq \log k'\)
- S:
-
polar solvent (polar constituent of the binary mobile phase)
- VM :
-
volume of mobile phase
- XS :
-
mole fraction of the polar constitutent of the binary mobile phase
- Δμ:
-
difference of the standard chemical potentials of the solute correction factor (see R′F)
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Soczewiński, E., Jusiak, J. A simple molecular model of adsorption chromatography XIV. RF or RM? Secondary retention effects in thin-layer chromatography. Chromatographia 14, 23–31 (1981). https://doi.org/10.1007/BF02262058
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DOI: https://doi.org/10.1007/BF02262058