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evka.d...@gmail.com

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May 6, 2008, 10:59:57 AM5/6/08
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Hello.
We're using Agilent 6890, 7890 with MS 5973A. Method is focused on
testing alkylated benzenes, naphthalens and PAHs. After full
maintainance what is shortening column, changing liner, cleaning
multiplier and changing filaments peaks start splitting. This problem
occurs only on front analytes what are very volutile compounds. The
rest of the run is ok. Calibration standards are prepared in hexane.
Tailing and splitting of peaks occurs in these compounds. Samples and
QC(fortified blank) are prepared in pentane. Responses are low
especially in front compounds.Differences in responses between using
pentane and hexane are huge. If you know anything about this problem
we'd appriciate any help.
Thanks
Eva

Sassman

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May 6, 2008, 3:45:55 PM5/6/08
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My guess would be a problem in the injection port. Are you using the
same kind of liner as before? Sure it is installed properly?
---
www.analyticalchem.com


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