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GC MS - contaminant 190.9 - 206 - 208

http://www.chromforum.org/viewtopic.php?t=30571

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GC MS - contaminant 190.9 - 206 - 208

Posted: Wed Apr 20, 2016 7:28 am
by KevinBe
Dear All,

I just cleaned the source, changed the column of my GC MS but I see a strange contamination (see attached file)

Image

Any idea about what this could be?

Thanks a lot,

Kevin

Re: GC MS - contaminant 190.9 - 206 - 208

Posted: Tue Apr 26, 2016 2:50 pm
by JMB
m/z 191 & 207 are both indicative of siloxane column bleed and tend to increase as the temperature increases; suggest that you disconnect the column from the MS and run a conditioning temperature program.
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