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Seeing m/z 403 in positive mode
Posted: Thu Jan 07, 2010 6:50 pm
by Callllii
Using a Tributylammonium Acetate mobile phase and am only seing it in the positive mode. I'm thinking it has to do with the mobile phase (as it's throughout the run), but can't figure out what it could be?
Posted: Thu Jan 07, 2010 7:14 pm
by yangz00g
m/z 403 is not a common background ions in ESI+, TFA (triflouroacetate) will produce a 403 in ESI, it may be a possibility in your case.
Posted: Fri Jan 08, 2010 1:52 am
by Callllii
Okay it seems to be tributylamine oxide (2N+H) from the mobile phase. Adjusting cap exit voltage and switching to enhanced mode did the trick.