Gas Chromatography
In column switching chromatography

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

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Gas Chromatography
Split injection is carried out by

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

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