CARRIER GAS

Chromatography Forum: GC Archives: CARRIER GAS
Top of pagePrevious messageNext messageBottom of pageLink to this message  By Anonymous on Tuesday, June 29, 1999 - 06:33 am:

Will there be any problem if I use Helium as a carrier gas instead of Nitrogen.If any what kind.
Please help me out thank you.


Top of pagePrevious messageNext messageBottom of pageLink to this message  By jclark on Tuesday, June 29, 1999 - 09:25 am:

There will be no problem. For capillary chromatography, the optimum linear velocity for helium is about 20 cm/sec. For nitrogen it is about 11. Hence, you can run faster with helium without sacrificing efficiency.
If you are doing gas analysis with a TCD, a switch from N2 to He will cost you some sensitivity where H2 is concerned.


Top of pagePrevious messageNext messageBottom of pageLink to this message  By bjenko on Tuesday, October 5, 1999 - 09:46 pm:

What detector are you using??

If you are using an ECD, Helium will be a problem. You will require either N2 or Methane/Argon as a makeup gas.

The impact of this change on FIDs, FPDs and PIDs is not so serious.

If you are using a TCD, the change in sensitivity is great, and there may be GC settings that control filament current that MUST be changed.


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