Chromatography is the collective term for a set of laboratory techniques for the separation of mixtures. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase. The various constituents of the mixture travel at different speeds, causing them to separate. The separation is based on differential partitioning between the mobile and stationary phases. Subtle differences in a compound’s partition coefficient result in differential retention on the stationary phase and thus changing the separation.
Chromatography may be preparative or analytical. The purpose of preparative chromatography is to separate the components of a mixture for subsequent use (and is thus a form of purification). Analytical chromatography is done normally with smaller amounts of material and is for measuring the relative proportions of analytes in a mixture.
Galbraith offers the following chromatography services
Ion Chromatography for analysis of cations and anions.
Gas Chromatography for analysis of organic substances with relatively low boiling points.
High Performance Liquid Chromatography for analysis of organic substances with relatively higher boiling points or compounds that are not thermally stable.
Thin Layer Chromatography is a rapid non-instrumental technique for determining the constituents of a mixture. This technique relies on a visual observation of the components, hence it is primarily for determining high concentrations.