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How to clear HMPA contamination in 6120 Quadrupole LCMS?

Question asked by rp2020 on Nov 9, 2020

We ran two HMPA containing samples on our LCMS and now have consistent and reproducible ~180 (M) and ~360 (2M) peaks show up in the spectra.  Tried running blanks, changing carrier solvent polarity - did not help.

 

Thoughts on what we should do to get rid of this contamination are much appreciated.  Thank you.

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