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.
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.
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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