Hi guys,

I am looking at fluorinated USC compounds and degradation compounds by LCMS with C18 column using ammonium acetate in H2O (MP A) and MeOH (MP B).

I am running some samples in scan mode and have these ions present in a peak at the very start of my gradient run at 10% B.

From known contaminates published its possible sodium acetate clusters however there should be no sodium present. My m/z 59 ion is from the ammonium acetate which is fine, but also unsure on the 141 ion. Any help would be great.