Gas Chromatography
Headspace analysis is carried out in order to

determine the psychological state of the tutor
analyse volatile compounds from solid or liquid samples
determine non-volatiles
analyse the column contents ahead of the sample

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Gas Chromatography
In column switching chromatography

compounds trapped on one column are eluted to another column
any of the above
one column is removed and replaced by another
the flow to the column is switched on and off repeatedly

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Gas Chromatography
Column bleeding occurs when

traces of the stationary phase are eluted
elution of the analyte is extended over time
the column breaks during installation and causes personal injury
the column is cracked and stationary phase leaks out

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