172 User Information
Troubleshooting and Error Messages
Unwanted background noise or peaks
In theory a run containing a sample has no unrecognized peaks
in the chromatogram. Unwanted peaks or ghost peaks result
when an unknown is present in the sample vial or flow path.
Verify that the GC works properly. If possible, mount an ALS
over the inlet and inject a sequence of internal or calibration
standard directly into the inlet. If there are no unrecognized
peaks, the problem is not in the GC.
Check the following in the Headspace Sampler:
• Possible contamination in sample preparation materials and
techniques.
• Check for leaks and restrictions in the carrier flow path. The
flow path starts at the sample probe and ends at the GC inlet.
See Leak Test on page 148.
• Possible contamination in lab air. Run a standard after
purging the vial headspace with nitrogen or argon.
medium_standard.book Page 172 Tuesday, February 17, 2004 10:14 AM
To Next Page
Loading...
Need help?
General
