Chromatography Forum

What is the best way to separate C2H2-C2H4-C2H6-CH4 in pure O2 using a FID as detector.
I want to heartcut or backflush most part of the O2 to avoid to run the FID in O2.

thank you

Use a backflush to vent three column heartcut configuration using a Chromosorb 106 or Porapak Q backflush column, a Porapak N as the second column and a shorter column of 106, Q, or N as the elution adjustment and buffer column.

Heartcut the O2 to vent and backflush the C3+.

Good luck,

Rod

I would be interested to know why you do not want the oxygen in your sample to go through the FID.

Gasman

My guess would be that Tigerk is operating an optimized FID to measure ppb amounts of hydrocarbon and does not want to have a big plug of oxygen disturb the flame at a critical measurement time for methane. For the same reason hydrogen is not used as a carrier but nitrogen or argon instead.

Of course he could use air as a carrier and the effect would be highly reduced but he would need to have extremely clean air to do his analysis.

best wishes,

Rod

Exactly,
I want to use Argon as carrier and I need to measure low ppb hydrocarbons. So, I want to make sure the flame will be stable. I will use UHP H2 and air for flame.

So, by using Rod configuration I think I will be able to do the application.

what do you think?

I would use nitrogen carrier unless that is a problem. A lot cheaper I think, no?

best wishes,

Rod