Applies to: Chromatography Smart (GC/MS) Tickets Solved: 0 Rank: 9.6
The air peak, sometimes called the CO2 peak, is the first large peak present in all GC runs on the HAPSITE. This peak will be present near the 1:30 mark and typically have a TIC (Total Ion Chromatogram) between 1 and 3 million. The TIC will vary greatly between instruments and operators. TIC counts below 1 million indicate a completely operational instrument provided that IS peaks are present. TIC counts greater than 3 million indicate a possible leak.
A leak check is required to verify there is no excessive loss of nitrogen (See: “ I Have a Nitrogen leak, what should I do ”?). If a leak is present, the operator should contact technical support for assistance in correcting the leak. If no leak is found, the operator should conduct a PMCS to verify the instrument passes QC. If the instrument passes QC, the reason for the higher TIC count may a result of higher sensitivity to ions in the mass spectrometer.
For more questions regarding this issue please contact technical support.
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Keywords: CO2, Scan Range, TIC, Retetntion Time, Air Peak