What is GC?
Gas Chromatography, or GC, is a separation of compounds in the gas phase based on the same types of interactions as in HPLC. Only volatile organic compounds can be used. Compounds are separated due to differences in their ability to partition, or transfer between the stationary and mobile phase. Usually this partition is based on polarity when doing GC analysis. The analysis is done at high temperature, usually 5-10oC higher than the highest boiling point in the mixture.

GC Links
·  GC Introduction - Virginia Tech Chemistry Dept
·  Gas Chromatography - Sheffield Hallam University
·  Gas Chromatography - detailed look at the methodology and instrumentation behind GC
·  GC Detectors - How various common GC detectors work

Waters Mass Spectrometry Primer