GC and GC-MS

GC and GC-MS - 5/24/11 Click to edit Master subtitle style...

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Unformatted text preview: 5/24/11 Click to edit Master subtitle style GC and GC-MS Gas Chromatography and Gas Chromatography-Mass Spectrometry 5/24/11 Uses Mainly  Separate mixtures  Test the purity of a substance GC has its limitations, only those that can vaporize without decomposing are separated. There is also preparative gas chromatography which gives pure compounds from a mixture. 5/24/11 Chromatograph 5/24/11 Carrier Gases (mobile phase) Carrier Gases are the mobile phase.  They are inert gasses that do not react with the analyte  Have a low thermal conductance 5/24/11 Stationary Phase Capillary Columns:  25-60m long with a diameter of tenths of a millimeter  The coating on the inside is a very viscous liquid, so much so that it is almost like a solid  The coating ranges between various polymers including polyimide Ex. Wall Coated Open Tubular (WCOT), Porous Layer Open Tubular (PLOT) and Fused Silica Open Tubular (FSOT)  They all have some sort of micro-pores and a coating that allows the analyte to adsorb This is to increase the surface area of column so the analyte has more sites of adsorption. 5/24/11 Flow Rate The flow rate of the carrier gas contributes to separation and retention time....
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GC and GC-MS - 5/24/11 Click to edit Master subtitle style...

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