7
Diagnostics and Troubleshooting
Troubleshooting
118 TSQ Quantum XLS Series User Guide Thermo Scientific
Issue: Excessive
injection port septum
bleed (Typical m/z 207,
429, 355, 281).
Possible causes/solutions
• The septum is worn out or damaged. Replace the septum.
• Small pieces of septum are in the injection port liner. Replace the injection port liner;
condition the capillary column.
Issue: Phthalate
background (m/z 149,
167, 279).
Possible causes/solutions
• Phthalate contamination has occurred due to sample handling or solvent contamination.
• Packaging materials could be the source of phthalates.
• Isolate source of phthalates such as vial lids or plastic solvent containers and remedy.
Issue: Excessive
hydrocarbon
contamination (Typical
ions are m/z 43, 57, 71,
85, 99).
Possible causes/solutions
• Carrier gas tubing is contaminated.
• Isolate source of hydrocarbon contamination and remedy.
• Replace carrier gas tubing.
• Change carrier gas filters.
Issue: Chemical
background due to
rhenium oxide
(m/z 185/187, 201/203,
217/219, 233/235,
250/252).
Possible causes/solutions
• These series of rhenium oxide ions come from oxidation of the rhenium filament wire
due to introducing air into the ion source while the filament is on.
• Check for air leaks and remedy. For more information, see “High Vacuum Issues” on
page 121.
Issue: Spectra are
observed due to the
following solvents:
Solvent spectra
Acetone (m/z 43, 58, 59)
Hexane (m/z 41, 43, 56, 57, 58, 85, 86)
Methanol (m/z 31)
Methylene chloride (m/z 84, 83)
Toluene (m/z 91, 92)
Trichloroethane (m/z 151, 153)
Xylene (m/z 105, 106)
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