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Peak at m/z 32 but no m/z 28. Oxygen but no nitrogen?

Question asked by testuser on Nov 16, 2015
Latest reply on Nov 16, 2015 by testuser3

Hi everyone. Posting on behalf of someone else.


My colleague is using an HP 6890 GC with a 5973 mass selective detector. We're observing a mysterious oxygen peak at m/z 32. I would normally suspect it's caused by an air leak, but there is no accompanying peak at m/z 28. The helium gas tank and the gas purifier have been replaced, and all fittings have been checked for potential leaks (although again there's no m/z 28). Does anybody have any idea where this peak may be coming from?