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...Gas chromatography is a technique used for separation of volatile substances or that can be made from one another in gaseous mixture at high temperatures sample containing the materials to separated injected into chromatograph mobile phase carrier moves through column contains wall coated granular solid stationary as flows components come contact with different have affinities which results differential migration solutes thus leading both qualitative and quantitative analysis comparison retention times identify by comparing peaks standards same limitations there are two types gsc liquid glc this case like silica alumina it affinity towards adsorption onto determines part time course suitable chromatographic most useful gases ch co etc very low volatility while widely species presence wide variety phases contrasting selectivity easy preparation add assets simply gc...