Chromatography refers to a set of techniques used to separate different compounds. It is commonly used in laboratories to isolate new compounds, analyze subtle differences between different environmental samples, and even in the sequencing of DNA.

Gas Chromatography or GC is used to separate mixtures of volatile compounds based on relative boiling points (or vapor pressures).

Gas-chromatography can also be combined with a mass spectrometry detector for highly selective sample analysis. The SRIF GC-MS is acutally two instruments in one!

High Performance Liquid Chromatography ( HPLC ) is used to separate mixtures of compounds based on relative polarities.