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This question is regarding GC analysis: How does the column separate the components? By polarity or...

This question is regarding GC analysis:

How does the column separate the components? By polarity or by boiling point?

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Answer #1

Gas chromatography is a process that separate the component mixture primarily based on their boling points( or vapour pressures) diffrences.

The concentration of compound in gas phase is soley a function of vapour pressure of a gas.The boiling point of a compound is often related to its polarity. The lower boiling point means , the higher the vapour pressure of the compound and the shorter the retention time usually is the compund will spent more time in the gas phase( mobile phase).

The separation of compouind is based on different strengths of interaction of the compounds with stationary phase.

the stronger the interaction is , longer the compound interacts with stationary phase, the more time it takes to migrate through the column.

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