Retardation factor
In
chromatography, a retardation factor (Rf) (also known as retention factor) is a ratio defined as follows: For example, if particular substance in an unknown mixture travels 2.5cm and the solvent front travels 5.0cm, the retention factor would be 0.5. An Rf value will always be less than 1 since the solvent front always travels further than does the substance under investigation. An Rf value is characteristic for any given compound (provided that the same stationary and mobile phases are used) and so may be useful in the identification of unknown components in a mixture.
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Rf (chromatografia)
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retention factor
retention factor (retention rate)
Calculated from an adjusted retention time, the retention factor (k) describes the period of time a solute resides in/on the stationary phase relative to the time it resides in the mobile phase.
(see:
retention time)