Mass 31 when PFTBA is OPEN

[m.finnBMBM]

Hello All,

I have a 6890/5973 set-up. When in the Manual Tune is in Profile mode looking at peaks 69, 28, and 32, there is a peak at 31 that is between the abundances of the 28 and 32 - about 4,000 for the N2 as a reference. This peak at 31 is only present when the PFTBA is open and completely disappears when the vial is closed. Is there an easy fix for this? Is this something I should be more concerned about?

Regards,

m.finnBMBM

[James_Ball]

Hello All,

I have a 6890/5973 set-up. When in the Manual Tune is in Profile mode looking at peaks 69, 28, and 32, there is a peak at 31 that is between the abundances of the 28 and 32 - about 4,000 for the N2 as a reference. This peak at 31 is only present when the PFTBA is open and completely disappears when the vial is closed. Is there an easy fix for this? Is this something I should be more concerned about?

Regards,

m.finnBMBM

Was the cal gas vial ever rinsed with methanol? The mass you see from methanol is normally 31.