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- Posts: 2
- Joined: Thu Aug 31, 2017 3:04 pm
I'm new in this forum, I found it by a quick search on google.
I hope someone will be able to help me to solve the problem I encounter.
First, sorry for possible mistakes in formulation as english is not my native language.
Then, my problem occur during sequences of analysis of sample of a few semivolatil compounds (PCB, Phtalate, Pest.,...) extract in hexane on agilent GCMS (5977A).
The problem is a change of sensibility/response of the MS on every compound during the sequence, this happen after the injection of some kind of sample (especially the extract of Reference sample NIST2585 indoor dust). Even if the compound is not include on the sample.
For example with the sequence of injections of standards solutions of PCB 52 in hexane with injection of 2 reference extracts in hexane (without PCB) every 5 standards, here is the kind of response we get :
If someone have some more precise idea of where the problem can from, i'll be really happy to discuss.
Don't hesitate if you want more detail on method
Thanks a lot
Thomas