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chromatography

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chromatography

set of laboratory techniques for the separation of mixtures, based on differences in the relative affinities of substances for mobile and stationary phases

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About chromatography

In chemical analysis, chromatography is a laboratory technique for the separation of a mixture into its components. The mixture is dissolved in a fluid solvent called the mobile phase, which carries it through a system on which a material called the stationary phase is fixed. As the different constituents of the mixture tend to have different affinities for the stationary phase and are retained for different lengths of time depending on their interactions with its surface sites, the constituents travel at different apparent velocities in the mobile fluid, causing them to separate. The separation is based on the differential partitioning between the mobile and the stationary phases. Subtle differences in a compound's partition coefficient result in differential retention on the stationary phase and thus affect the separation.

Facts from Wikidata (CC0). Image by Flo~commonswiki via Wikimedia Commons (CC BY-SA 2.5).

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