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Stationary phase

The immobile material the mixture flows past. In paper it is water inside cellulose fibres; in classical column work and TLC it is silica gel or alumina; in ion-exchange it is a charged resin. The chemistry of this surface decides which analyte moves fast and which lags.

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Related terms

Mobile phase Resolution (Rs)Rf value ECD FID Isocratic vs gradient elution Limit of detection (LOD)MSD Partition vs adsorption Plate theory Retention time (tR)Rf (retention factor)

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