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High CO2, N2 and O2
Posted: Tue Nov 19, 2013 3:33 am
by lemontree0815
Recently, we changed the EI source on our GC/MS system. We did an autotune and everything looked fine. We were able to run some samples on it and get good results. But when we tune the GC/MS today, we found high N2 18.1%, high O2 3.8% and 14% CO2. Is this an air leak? The N2 and O2 ratio is about 5 and I never see CO2 so high before.
Re: High CO2, N2 and O2
Posted: Tue Nov 19, 2013 10:51 pm
by James_Ball
Check to see if the column nut is loose. If you install a new ferrule sometimes the graphite/vespel ferrules will shrink when heated and after a few oven cycles you will get a leak where the column enters the analyzer.
Re: High CO2, N2 and O2
Posted: Thu Dec 05, 2013 2:46 am
by loopylinda
Hi there it's just a leak most likely at the column transfer line interface tighten it a bit and all should be ok...