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Topic: Elution order of ethanol and water in GC  (Read 4755 times)

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goanna_s

  • Guest
Elution order of ethanol and water in GC
« on: November 23, 2005, 01:05:55 AM »
Can someone tell me why, when analysing a mixture of water and ethanol, the water peak comes out first?

I thought that less polar, more volatile compunds would elute first....


Anna

Vitnir

  • Guest
Re:Elution order of ethanol and water in GC
« Reply #1 on: November 23, 2005, 09:50:12 AM »
If its a standard non-polar column then water doesnt interact with the solid phase very well, ethanol can interact and is chromatographed slower. If you had a MS-detector you would see traces of water during the entire run and ruins some of the resolution, a polar column would be a better choice.

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