Gas_Chromatography - CHROMATOGRAPHY CHEM3001(C30J Chemical...

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CHROMATOGRAPHY CHEM3001- (C30J) Chemical Analysis II Donna A Minott-Kates
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DMK: CHEM3001 - Chromatography (2009-10) CHROMATOGRAPHY LIQUID GAS MOBILE PHASE PLANAR COLUMN STATIONARY PHASE PAPER, SILICA, ALUMINA PACKED CAPILLARY SFC
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Gas Chromatography Useful links http://teaching.shu.ac.uk/hwb/chemistry/tutorial (2010-01-20) Library 4 Science (open source): http://www.chromatography-online.org/ (2010- 01-20) Royal Society of Chemistry educational video http://www.youtube.com/watch?v=08YWhLTjlfo (2009-03-26) DMK: CHEM3001 - Chromatography (2009-10)
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Gas Chromatograph - layout DMK: CHEM3001 - Chromatography (2009-10) Source : http://www.kutztown.edu/acad/chem/chem_images/ instrumentation_images/GC_pics/GC_schematic.gif (2009-03-04) Flow meter Thermostatted Regulator For analysis of gases, volatile and semi-volatile materials
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Gas Chromatograph - layout DMK: CHEM3001 - Chromatography (2009-10) Source : http://jr.stryker.tripod.com/physchem/physchem_graphics/Mercury_gcms.jpg (2009-03- 04)
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Gas Chromatograph Carrier Gas Chemically inert eg N 2 , He, Ar Typically H 2 O and O 2 -free (use of traps) Regulated by flow meter Make-up gas Sample Injection Port Self-sealing septum through which sample rapidly introduced Use of calibrated micro-syringe Temperature controlled ( specified ) Heated metal block (flash heater) Zone temperature higher than boiling point of (liquid) samples Sample instantly vapourised DMK: CHEM3001 - Chromatography (2009-10)
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Gas Chromatograph Split/Splitless Injector Port GC may be operated in split mode to reduce sample volume introduced on to capillary columns Animation : http://spider-dev.pharmacy.strath.ac.uk/mscpharmanal/?tab=ani (2010-01-20) DMK: CHEM3001 - Chromatography (2009-10) Source : http://teaching.shu.ac.uk/hwb/ chemistry/tutorials/chrom/gaschrm.htm (2009-03-06)
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Gas Chromatograph Separation Column Packed or capillary Liquid stationary phase coated on inert support (Gas Liquid Chromatography) or Solid stationary phase (Gas Solid Chromatography) Limited use due to semi-permanent retention of active (polar) molecules giving rise to severe tailing of peaks Consequence of non-linear adsorption Thermostat DMK: CHEM3001 - Chromatography (2009-10) time tailing Gaussian curve
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Gas_Chromatography - CHROMATOGRAPHY CHEM3001(C30J Chemical...

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