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Lecture 18 High Preformance Liquid Chromatography I
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Column Injector Detector Chromatograph Data Processing
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Zone broadening: The van Deemter equation H - plate height u - flow rate
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Stationary phase in HPLC Chemically inert Non-soluble in any imaginable mobile phase Thermal and chemical stability Appropriate physical sorption of analyte Shape: Uniform spherical particles
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150 m 2 /g 300 m 2 /g
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Polar phase Nonpolar phase
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Percentage of solvents having the same eluent strength
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B - acetonitrile CH 3 CN
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Width W is proportional to retention time t r ‘general chromatography problem’
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Solution of GNP: gradient
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