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Two Columns
Posted: Wed Jul 13, 2011 7:28 pm
by itsbourne
Hi,
Some one asked me this question. I wasn't sure of the answer.
So, Just out of curiosity, Is it possible to have two columns at same time in GC?
Thanks
Re: Two Columns
Posted: Wed Jul 13, 2011 11:20 pm
by chromatographer1
Yes.
I once had 13 different columns in a GC (at the same time), a personal record.
best wishes,
Rod
Re: Two Columns
Posted: Thu Jul 14, 2011 12:57 am
by itsbourne
Rod,
Wow...can you tell me how I can do two..... I have a shimadzu GCMS QP2010S.
Any additional hardware required?
Thanks,
Jason
Re: Two Columns
Posted: Thu Jul 14, 2011 1:05 am
by chromatographer1
Do you need to use a MS detector?
You SHOULD only use one column per detector for the MS. You can put then in series of course, if there was some need to do so, but why is the question.
Best wishes,
Rod
Re: Two Columns
Posted: Fri Jul 15, 2011 5:52 am
by martsims
We have the same GC-MS system with a two column set-up. Individual injectors and then both columns go through a 2-hole ferrule into the MS (available from Shimadzu). Methods are set up so the flow on the column that isn't being used is reduced to a trickle so our vac pumps can handle it. Works fine.
Re: Two Columns
Posted: Fri Jul 15, 2011 2:17 pm
by achkata
Rod,
I'm curious what kind of sample requires 13 columns?
I've read just for two...
regards
achkata
Re: Two Columns
Posted: Fri Jul 15, 2011 3:07 pm
by chromatographer1
A multidimensional analysis of ppm levels of CO and CO2, as well as the full analysis of propylene, including a C5+ peak, separating the C4 paraffin isomers and olefins, and of course, the C2 isomers, also measuring hydrogen at the ppm level. This of course, is done with an isothermal oven, except the columns and valves for the hydrogen analysis which is done at ambient temperature.
Stack gas analysis also requires several columns.
GC is not limited to PE or Agilent hardware in a nice air conditioned lab. Try servicing a GC on top of a 'smoke stack' in a refinery!
best wishes,
Rod