Gas chromatography is a method that is used for the analysis of complicated mixtures, as well as the separation of them.
Chromatography can analyze mixtures of both inorganic as well as organic compounds. Most of the compounds that have a boiling point that is under 250 C can be easily analyzed by the gas chromatography techniques.
You can divide gas chromatography into two classifications. Gas-liquid chromatography is where a liquid that is not volatile is used in the stationary liquid phase. It is coated thinly on the solid support. Gas solid chromatography is where the sorbent is a large area of surface that is granular and solid in nature.
Gas chromatography uses
a moving gas phase. The carrier gas is usually an inactive one, helium or nitrogen is used and is flowing through the column that
is packed with the sorbent.
The passing of a liquid stage through a solid stage as well as dependence on subtle interactions between the various chemicals is the means by which the desired chemicals are separated into the pure chemical or substance that is to be isolated or measured--or both.
There are four components to gas chromatograpy, the carrier gas and the flow control, the sample injection area, and the chromatographic columns and oven, along with the detector.
Finding the type and the amount of a substance in another substance is accomplished by analyzing the peaks that appear on the chromatogram. In combination with mass spectrometry, the best and most information can be achieved, and for this reason, a combination of the two is often used.
See a page about chromatography
vials here http://labface.com/suppliers/Chromatography-Vials-227