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Thu, 22 Jun 2006 12:50:20 +0200 |
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Dear GC-IRMS users
I am having some problems with my Ar backgrounds, possibly a leak in the
injector. My current Thermo manual (Issue 06/2002) says that Ar (m/z 40)
in cup 45 should be less than 50mV but did not say anything about split
or splitless mode or wich flow. Present value is 80mV (split
20ml/minute) and column flow 1.0 . Talking with Finnigan technicians it
seems in the older manuals higher backgrounds, more or less what I have
now, where considered OK. So, could any of you using the same system
(Trace GC ultra and Delta plus XP with Trace DSQ as a second detector)
give me your normal working values?. In backflush mode the flow is
around 2.5 ml/minute and the He background for Ar is 7mV, Open Split is
always on.
Thanks
Dr. Rafael Nuņez Gomez
Technician
Stable Isotope Service
Estacion Experimental del Zaidin CSIC
Profesor Albareda 1, 18008
Granada, Spain
Tf +34958181600 Ext 228
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