•Partitioning = type of equilibrium where the analyte divides itself between two phases
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•For liquid-liquid extraction – two liquids
•For chromatography – mobile vs. stationary phases
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•Define a partition ratio K (or distribution constant)
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•                  Cs               where Cs & CM are
•         K = -------
•                  CM         concentrations of analyte in
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•                                stationary & mobile phases