u/Sweaty-Office6663

Hi all!! I'm trying to run approximately 40 analyte SIM method at the moment but I keep encountering spectrums that look like this at around 500 ppb and below. They look fine at around 5 ppm and up. I've tried troubleshooting through all normal method avenues, though I haven't changed anything physically on the machine yet.

Before I do has anyone else encountered this before?

Hi all!! I'm running a roughly 40 analyte SIM run at 100ppb and below on a Thermo Fischer GC-MS but I keep encountering spectrum that look like this and can't seem to figure out what the issue is. Has anyone encountered this before?

They look fine from around 5 ppm and up.

Please help me! I found this little guy in the gutter of my house and I would be really interested to know what he is.