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Principles of Gas Chromatography (GC)

Chromatographic techniques like GC involve passing a “mobile phase”, containing the sample, through a “stationary phase” which slows the mobile phase to varying degrees dependent on how strongly the components interact. This slowing causes the components to be separated in time.

In GC (Gas Chromatography), the mobile phase is the sample which has been vaporised and carried in an inert gas, typically Helium, through a column which contains the stationary phase which can either be a solid or liquid coated on a solid support which retards the passage of the mobile phase. Samples can be introduced by direct injection, after solvent extraction or from a headspace sampling system.

 HP6890 GC-FID InstrumentTypical Applications of GC

  • Formulation analysis of organic mixtures
  • Trace analysis of organic species
  • Waste solvent quantification
  • Health and Safety monitoring of organic species
  • Measurement of volatile species like waste solvent mixtures
  • Atmospheric sampling
  • Electronic Cigarette nicotine determinations.

Features of Laboratory’s GC Capability

LPD Lab Services has an HP6890 Gas Chromatograph / Capillary GC instrument with a diverse range of columns tailored for different applications. The Gas Chromatograph is fitted with FID -flame ionization detector.

GC-FID provides an accurate method of quantification for specific known species.

Instead of the direct injection system the HP6890 GC also can be fitted with an Hta H200h headspace injection system allowing volatile and degradation products to be measured in programmed temperature ramps up to 190°C.

The laboratory also has a GC-MS capability for more detailed breakdown of unknown or mixed organic chemicals or materials.

A  thermal desorption unit, can be attached for use with diffusive atmospheric sampling apparatus. The diffusive tubes are used for passive sampling of workplace atmospheres and can be worn on the lapel of operatives where they absorb a representative sample of the workplace atmospheric organics or samples can be collected using locally placed pumps with calibrated levels of air handling.

Our site experts on GC are Kim Nickson and Adam May.

Method Development and Validation

Analytical method development and method validation using the laboratory's range of techniques and experience



Application Notes
Document Title View
GC & XPS of Thermal processed Ni Cr & Catalytic Activity.
 

Please contact us to discuss how your requirements can be met using this or any of our analytical techniques. We can issue no-obligation quotations once we have discussed your needs and can offer two levels of service “urgent” and “normal”. We also offer preferential rates for longer term analysis contracts.

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