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HI Katie,
Would you be able to upload a screenshot of the contamination you're seeing? Or list the contaminant ions?
I regularly run 20mM and occasionally 200mM ammonium acetate into my QTOF for years and I do minimal cleaning so I don't think that is the source of contamination unless it was a poor grade.
A good general cleaning solvent is 50% IPA:Water + 1-2% acetic acid (I occasionally go higher). I don't flush into the MS though.
HI Katie,
Would you be able to upload a screenshot of the contamination you're seeing? Or list the contaminant ions?
I regularly run 20mM and occasionally 200mM ammonium acetate into my QTOF for years and I do minimal cleaning so I don't think that is the source of contamination unless it was a poor grade.
A good general cleaning solvent is 50% IPA:Water + 1-2% acetic acid (I occasionally go higher). I don't flush into the MS though.