effective carbon numbers for GC-FID

[sg]

Dear all,

Could anybody here help me to find out the ECNs value for carbon bond with various functional group?

Thank you very much!

[GOM]

It isn't a complete answer for you but,

1. The FID will only respond to carbon which can be burned to give CO2
2. So, for example, an oxygen linked to a carbon will effectively "neutralise" that carbon to the FID
3. Therefore, the less carbon atoms in the molecule, the greater the effect as a percentage reduction of signal.
4. So the "substance-specific correction factor" would be for example
Methanol 2.46
Ethanol 1.77
C3 alcohols 1.55
C4 alcohols 1.42
It is a similar story with other oxygenated compounds.

Hope that helps a bit.
Ralph

[MikeD]

I would only add that in my experience such factors are not very consistent (for oxygenated compounds anyway) from one FID to another - even the from the same manufacturer and apparently set up the same. If you get less than 10% difference, fine, but don't count on it.

[sg]

Thank you very much for your information!