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- Posts: 1
- Joined: Sat Aug 03, 2019 4:33 pm
Can anyone help me with a baseline/detector issue? I am running Pesticides and PCB on an Agilent 7890B GC with dual ECD's. Five days ago my output value jumped from 192 to 32,000. I don't know why. I have baked everything on the instrument and the value went down to 4000. I ran PEM and CCV overnight and this morning the value was at 440,000. When the detector temperature is below 100 the value starts to go down but when I increase it to 330 the value jumps back up to 440,000.
Also, I run a DDT/Endrin breakdown check. Both the endrin and DDT breakdown is above 60%. Our requirement is <15% breakdown. I have cleaned out the inlet, changed the liner and septa. A new column was put in a few weeks ago. I clipped the new column. I checked for leaks and nothing. The breakdown is still high.
Has anyone had a similar problem? Or can anyone provide me some things to try?
I'd appreciate any help you can give.