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Inconsistent areas for gas injections.
Posted: Wed Mar 14, 2012 12:40 pm
by meenabk
The areas for gas injections to Agilent GC with SCD is giving very inconsitent areas. It varies from 10,000 to 90,000 with each run. When liquid sample is injected the area difference is mostly within 1000. The injections are done at 40:1 split ratio.
What other information will be needed to suggest what the problem is?
thank you
Re: Inconsistent areas for gas injections.
Posted: Wed Mar 14, 2012 3:48 pm
by GasMan
More information is needed.
Which Agilent model of GC.
Are you using a valve for gas injection
If you are using a valve, are you using pre-treated tubing and inlet such as Sulfinert, Silcosteel or Ultimetal treatments.
Gasman
Re: Inconsistent areas for gas injections.
Posted: Thu Mar 15, 2012 5:37 am
by meenabk
We are using Agilent Gc, 7890A model.
Yes there is a gas valve used, and all are pre treated.
Re: Inconsistent areas for gas injections.
Posted: Fri Mar 16, 2012 4:04 pm
by Johnny Rod
What are the analytes? What solven are you using when you make a liquid injection? At what temperature is the gas valve kept?