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guevara1967

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soundhorizo: ACI+1, 辛苦 2012-05-01 11:23:07

separation factor,
in column chromatography
The relative retention value calculated for two adjacent peaks ():

By definition, the value of the separation factor is always greater than unity. The separation factor is also identical to the ratio of the corresponding distribution constants. The separation factor is sometimes also called the 'selectivity'. The use of this expression is discouraged

relative retention,
in column chromatography
The ratio of the adjusted or net retention volume (time) or retention factor of a component relative to that of a standard, obtained under identical conditions:

Depending on the relative position of the peak corresponding to the standard compound in the chromatogram, the value of may be smaller, larger or identical to unity.