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- Posts: 3
- Joined: Thu Jun 20, 2019 2:16 pm
I have a OI analytical purge and trap connected to a trace ultra gc and DSQII mass spec.
We have developed a problem with failed QC results and it appears to only really effect mass 91. Unfortunately for us this mass is used for quite a few compounds for quantitation.
The ion source has been cleaned, the column trimmed and everything else i can think off. We have had problems with the instrument since coming back after the xmas holiday 6 months ago. Since then just about every part has been replaced with new including the heated transfer line. There are also no obvious leaks according to the air water spectrum or using the helium detector.
Could this issue that seems to only effect mass 91 mean i just need to do more cleaning. I am kind of hoping this is something someone has seen before.
any suggestions would be most welcome.
thanks
Rory