Characteristics Of Gas Chromatography
INTRODUCTION
Gas chromatography is analytical technique used to separate and analyze the compounds which can be directly vaporized, without decomposition. Gas chromatography is utilized to purify, separate and identify a compound in a mixture. Gas Chromatography (GC) can be used to synthesize and extract pure components from a mixture of compounds.
GC is also termed as VPC (Vapor-Phase Chromatography) or GLPC (Gas–Liquid Partition Chromatography).
The mobile phase in GC is usually a carrier gas, which may be helium (an inert gas) or nitrogen (an unreactive gas). A thin liquid or polymer layer supported on an unreactive solid is used as stationary phase. It is walled in a column of glass or metal. "Gas separator" or "Aerograph" are other terms of Gas Chromatograph. Retention time of different components vary according to their interaction with the coating of column walls. Comparison of tr (retention times) is important characteristic of gas chromatography (GC). GC and fractional distillation are almost similar in their principle because both processes separate components on the basis of difference in the boiling points. However, GC is commonly used on smaller scale (in labs) and for large separations fractional distillation is used.
DETECTION SYSTEMS:
Mixture’s components eluted with carrier gas are measured quantitatively by the detectors placed at the column end. There are two terms used for detection properties: specific and bulk properties. Bulk
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