Gas Chromatography GC

An education video from the Royal Society of Chemistry on gas chromatography using a flame ionisation detector (FID) with a brief mention of gas chromatography mass spectrometry (GCMS). From the “Modern Instrumental Techniques for schools and colleges” DVD. For more information on the Chemistry for our Future programme please visit (C) Royal Society of Chemistry


45 thoughts on “Gas Chromatography GC

  1. How can we separate the Methane and Carbon dioxide by GC? What does three or four peaks refers on GC when separating the methane and carbon dioxide gas? How would you calculate the volume of gases on ml/liters?

  2. Why would you need to use GC and MS together? Do they not both show the composition of a mixture? What benefit is there to using both together?

  3. The boiling point of methyl benzene is 110 degrees C and the boiling point of methanol is 64.7 degrees C. Methanol is more volatile than toluene. The molecular size of benzene is considerably greater than that of methanol. There are several factors which influence volatility not just one.

  4. Thank you for the video! But I have a question, isn't methanol more polar than methylbenzene? A more polar molecule would be less volatile. Therefore should the first compound that was shown through GC be the more volatile molecule methylbenzene (less polar), rather than methanol?

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