2
Troubleshooting
Investigating Contamination Issues
Thermo Scientific
ISQ 7000 Hardware Manual
127
You may have a leak that is allowing solvent vapors to get into the ISQ 7000 instrument. Use a spray gas, such as Tetrafluoethane, to
check for leaks and then fix them. See
for details.
Optimize the GC method to separate the solvent peak from the area of interest in the chromatogram. The following compounds may have
been introduced during sample injection, a cleaning or autosampler rinsing solvent. The following commonly used solvents have ions at
the listed
m/z
:
•
Acetone (
m/z
43, 58, 59)
•
Hexane (
m/z
41, 43, 56, 57, 58, 85, 86)
•
Isooctane (
m/z
57, 99)
•
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)
Table 3.
Common Contaminants
Ions (
m/z)
To Monitor
Compound
Possible Source
13, 14, 15, 16, 17, 29, 41, 57
Methane
CI gas
18, 28, 32, 44 or 14, 16, 19
H2O, N2, O2, CO2 or N, O
Residual air and water, air leaks,
outgassing from Vespel ferrules
69, 100, 119, 131, 169, 181, 214, 219,
264, 376, 414, 426, 464, 502, 576, 614
PFTBA and related ions
PFTBA (tuning compound)
31
Methanol Cleaning
solvent
43, 58
Acetone
Cleaning solvent
78
Benzene
Cleaning solvent
91, 92
Toluene or xylene
Cleaning solvent
105, 106
Xylene
Cleaning solvent
151, 153
Trichloroethane
Cleaning solvent
149
Plasticizer (phthalates)
Use of vinyl or plastic gloves
Peaks spaced 14 amu apart
Hydrocarbons
Fingerprints, foreline pump oil, or other
hydrocarbons
Possible Remedies
Содержание ISQ 7000
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Страница 174: ...2 Troubleshooting Contacting Technical Support 146 ISQ 7000 Hardware Manual Thermo Scientific ...
Страница 400: ...3 Advanced Maintenance Replacing Fans and Filters 372 ISQ 7000 Hardware Manual Thermo Scientific ...