What is gas chromatography?

Gas chromatography(GC)

Is an universal type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized, without decomposition. 
It is based on a difference in the distribution of the substances to be separated between a liquid or solid stationary phase and a uniform gaseous mobile phase
Characteristic is the high analysis speed, the high resolving power and the accuracy.
Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture. These chemical components are usually organic molecules or gases.

Many years ago was Gas chromatography, analytical whise, the most important separation technique. But that changed in the last century. The importance of HPLC has increased in the late 1980s and early 1990s. Both methods complement each other to form a powerful and universal set of separation instruments.
There are various devices with which you can perform the gas chromatography method. Many of these GCs are of the Brands: Agilent, Shimadzu, Perkin Elmer and Thermo.

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