Common Contaminants - Thermo Scientific TSQ 8000 Evo User Manual

7
Troubleshooting
How to Know When Your System Needs Maintenance
118 TSQ 8000 Evo User Guide
Table 3. Common Contaminants
Ions (m/z) To Monitor
13, 14, 15, 16, 17, 29, 41,
57
18, 28, 32, 44 or 14, 16, 19 H
69, 100, 119, 131, 169,
181, 214, 219, 264, 376,
414, 426, 464, 502, 576,
614
31
43, 58
78
91, 92
105, 106
151, 153
149
Peaks spaced 14 amu apart
Compound
Methane
O, N , O , CO or N, O
2 2 2 2
PFTBA and related ions
Methanol
Acetone
Benzene
Toluene or xylene
Xylene
Trichloroethane
Plasticizer (phthalates)
Hydrocarbons
Possible Source
CI gas
Residual air and water, air
leaks, outgassing from
Vespel ferrules
PFTBA (tuning
compound)
Cleaning solvent
Cleaning solvent
Cleaning solvent
Cleaning solvent
Cleaning solvent
Cleaning solvent
Use of vinyl or plastic
gloves
Fingerprints, foreline pump
oil, or other hydrocarbons
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