Gas chromatography

• Gas chromatography is different to paper and Thin layer chromatography
• The stationary phase in gas chromatography is silica or aluminum powder packed into a metal column.
• The mobile phase in gas chromatography is an unreactive carrier gas such as nitrogen so it does not react with the sample.
• Gas chromatography separates the components of a mixture and also measure how much of each component there is.
• In gas chromatography , the sample is turned into the gas state when it is injected into the column.
• Once the sample has been changed into the gaseous state in gas chromatography, The carrier gas pushes the sample through the column.
• Each different component of the substance takes different times to travel through the column depending on how strongly they bond to the stationary phase.
• A detector sends a signal to a computer as each component leaves the column. The computer then produces a chromatograp which leaves each component in a peak plotted against the travel time.