Gas Chromatography
Headspace analysis is carried out in order to

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

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Gas Chromatography
What does the selectivity factor describe?

The relative separation achieved between two species
The maximum number of different species which a column can separate simultaneously
The proportional difference in widths of two chromatographic peaks
None of these

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Gas Chromatography
Split injection is carried out by

splitting the sample into smaller portions to inject at the same time through parallel ports
splitting off some of the sample so that it does not enter the column
None of these
splitting the sample into smaller portions to inject sequentially

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