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- Posts: 50
- Joined: Mon Sep 28, 2015 11:47 pm
I have just moved our GCMS to a new lab and am running some blanks to see if there are any contaminants in the system. I know we need to see a clean baseline with no peaks and only a low level of bleed, but I am interested to know which ions are "typically" seen in the background of a blank sample and in what ratios. For example, in a blank run I typically see m/z 36, 40 and 44 with insignificant amounts of other ions. I'm not scanning below 30 m/z so I might be missing anything lower than that. I'm using helium as carrier.
So, what ions should normally be seen in the background and is this consistent across all systems?