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- Posts: 1
- Joined: Mon Apr 07, 2014 7:21 pm
I would like to have some advice on choosing detectors for my gas sample. My sample is gaseous, which contains mainly CO2 saturated with H2O vapor, and trace of CH4, CO, O2, N2 (ppm). I have a decent separation of CH4, CO, O2 and N2 using CarbonPlot (Agilent) capillary column (CO2 and H2O come out at the end of the run when oven temperature is high) . I am using Agilent 6890N GC (FID and TCD as detectors) which is coupled with 5975 MS.
Do you have any recommendation how to best run this for quantitation of CH4, CO, O2 and N2?
I am currently using GCMS for this task and running under SIM mode (Selected Ion Monitoring), which works alright for me. But most literature uses TCD for CO and CH4 in gaseous CO2+H2O, which puzzles me a bit.