Gas Chromatography
Split injection is carried out by

splitting the sample into smaller portions to inject sequentially
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

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Gas Chromatography
Column bleeding occurs when

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

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