Notes on Troubleshooting LC/MS Contamination
General Discussion ............................................................................................................. 2
Phthalate Contamination (391, 413 798, 803) ................................................................... 3
+44 Series............................................................................................................................ 4
Background Ramps Up With Gradient ............................................................................... 4
+59 Series............................................................................................................................ 5
+77 Series............................................................................................................................ 5
+74 Series............................................................................................................................ 5
615.7 and 1229.8 CHAPS .................................................................................................. 5
Nanospray Peaks (371, 445 and others).............................................................................. 7
+136 Series.......................................................................................................................... 7
Pentafluoropropionic Acid .................................................................................................. 8
Water................................................................................................................................... 8
798 and 803 Contamination................................................................................................ 8
Peak Clusters at +21, -17, -35, -52..................................................................................... 9
Common Contaminants in Protein/Peptide Analysis.......................................................... 9
Removing Ultramark Contamination................................................................................ 13
Trouble Shooting Excessive Noise In the LCQ, DUO and DECA................................... 14
HPLC Equipment as sources of contamination ................................................................ 16
Ghost Peaks....................................................................................................................... 16
Purge Procedure for Surveyor MS Pump Pulse Dampener .............................................. 17
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