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Shift in mass for the tune ions in negative mode

http://www.chromforum.org/viewtopic.php?t=88414

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Shift in mass for the tune ions in negative mode

Posted: Wed Aug 15, 2018 1:23 pm
by sriharshabio
Hello,

We have an agilent 6545. Today when we are doing a mass calibration check, the masses of the negative tune ions seems to be shifted (For example 1633.9988 is now showing 1639.2109 and so on for the other ions) and mass calibration check seems to be failing. The masses for positive ions seems to be fine and mass calibration check has passed. Any suggestions on what can be done?



Thanks



Harsha

Re: Shift in mass for the tune ions in negative mode

Posted: Sat Aug 18, 2018 3:55 am
by M.John
Hi Harsha,

Did you try to Auto tune the MSD in negative mode? Is peaks intensity satisfactory?
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