Investigating Contamination Issues - Thermo Scientific TSQ 9000 Hardware Manual

Investigating Contamination Issues

Thermo Scientific
Some chemical noise is common and difficult to eliminate completely.
Chemical noise is sometimes caused by:
• Septum bleed after a series of injections.
• Vial sample bleed, which occurs if more than one injection is made from a sample vial.
• Siloxane peaks that appear in the chromatogram at regular intervals from focusing at the
head of the column or in the injector.
Other possible contamination sources include hydrocarbon contamination of the carrier gas,
foreline pump, or cleaning solvents.
To minimize chemical noise, always wear clean, lint- and powder-free gloves when performing
maintenance on components that go inside the vacuum chamber and always use clean carrier
gas, filters, and liners.
WARNING
issue that requires removing a cover on the TSQ 9000 mass spectrometer,
you should power-off and vent the instrument to avoid harming yourself.
AVERTISSEMENT RISQUE D'ÉLECTROCUTION : lorsque vous cherchez à
résoudre un problème nécessitant d'enlever le couvercle du spectromètre de
masse TSQ 9000 mettez hors tension et ventilez l'instrument pour éviter de
vous blesser.
ELECTRICAL SHOCK HAZARD: When troubleshooting any
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Troubleshooting
Investigating Contamination Issues
TSQ 9000 Hardware Manual 107