Gas Chromatography
Which of the following are not used as stationary phases in a GC column?

Polysiloxanes
None are used as stationary phases
Cyclodextrins
Silica

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Gas Chromatography
Column bleeding occurs when

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

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