A few questions

Which compounds can be separated by gas chromatography?

Volatile or volatilizable compounds can be analysed: permanent gases, volatile solvents, aromas, and generally compounds with a molecular mass lower than 400 g/mole
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What is the advantage of the split injection mode (division mode)?

It preserves the chromatographic resolution and avoids saturation phenomena.
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How to choose the nature of the stationary phase adapted to the separation?

The stationary phase must be adapted to the polarity of the solutes to be separated.
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How are the column dimensions chosen?

The choice of the column geometry depends on: the volatility of the solutes, the analysis time, and the complexity of the mixture to be separated.
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