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Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 17 Chromatography Page 307 <strong>of</strong> 316General Elution Problem / Gradient ElutionA mixture <strong>of</strong> molecules <strong>with</strong> strongly differing k’ valuesis hard to separate because:If the solvent is weak enough to separate 1 and 2:a. Separation takes too longb.Peaks 5 and 6 broaden into baselineIf the solvent is strong enough to elute 5 and 6 in areasonable time:Peaks 1 and 2 and 3 and 4 co-elutePage 307 <strong>of</strong> 316

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