Chapter 22 - Gas Chromatography

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  Chapter 22 - Gas Chromatography Column separation (gas-liquid, gas-solid) used for separating and analyzing compounds that can be vaporized without decomposition. Separations based on differences in boiling points! Lower b.p Higher b.p  Conditions ã Carrier gas (mobile phase) does NOTHING in GC but transport the compounds. Not involved in separation mechanism (H 2  and He common). ã Injection volume (0.1  –  10 μ L generally). Temperature of injector is 50 o C greater than least volatile (highest boiling point compound). All compounds must be vaporized before transport onto column. ã Carrier gas is often dried by passage over molecular sieves as they strongly retain water. Activated by heating to 300 o C in vacuum. ã Gaseous mobile phase carries gaseous compounds (analytes) through a long column with a stationary phase.  Injector Must vaporize all of the analytes in sample. Often the injector temperature is about 50 o C the least volatile analyte. 0.1 to 10 μ L  Column Types N = L/H
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