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- Posts: 3
- Joined: Wed Sep 09, 2020 3:19 pm
Figured I would try out my luck here. I have been having a recurring issue with my Agilent GC-MS (GC 7890A and MS 5975C) where my samples will look good for a while, and then randomly the baseline will start to have troughs and negative peaks. Myself and service engineers have gone back and forth ruling out several flow and electronics issues.
Anyone ever have something similar occur? Tunes are looking ok with no leaks, however the m/z 219 abundance is above the m/z 69 by around 10%. The steps we have take so far include:
-New column
-New fittings and consumables (unions, nuts, liner, septum, gold seal, etc)
-With a guard column and without
-Cleaned the source
-New EM power supply
-New HED
Any help or suggestions would be appreciated!