interstitial fraction
in chromatography
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https://doi.org/10.1351/goldbook.I03120
The interstitial volume per unit volume of a packed column. Defined by: ɛI = VI/X where V I is the interstitial volume and X the column volume.
Source:
Orange Book, 2
nd
ed., p. 100 (https://media.iupac.org/publications/analytical_compendium/)