Dear Mayara,

if your masspec have a dual Inlet you may fill one of the bellows with SO2 and run the reference gas from there at least to test the masspec.

Good luck Heike

On 2/3/2017 5:15 PM, Mayara Matos wrote:
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Dear colleagues,

I'm seeking for some help from the ones working with S analysis in EA-IRMS. My reference SO2 peaks started to gradually disappear over time until no signal was observed, which made me think the tank was getting empty. This assumption combined with the low vapor pressure in the SO2 tank (showing a pressure around zero) made us purchase a new tank...

After installing the new SO2 tank, Isodat shows readings of no more than 1 mV for m/z 64 and 3mV for m/z 66. Because of this, an error message always pops up saying: "running script returns a fatal error: peak center failed." I opened our Conflo IV and checked if there was an actual gas flow from the tank to the capillaries coming out of the heated SO2 regulator (Conflo IV) and everything seems okay. Also, when I run a sequence for CNS, everything works fine for C and N but the system cannot make a jump to SO2.

Does anyone have a suggestion on how I can fix this problem? I couldn't find this exact issue on the Isogeochem archives.

Any help is appreciated.

Thank you!

Mayara Matos

Mayara P. V. Matos 
PhD Candidate
Graduate Teaching Assistant
Department of Biology
West Virginia University
221 Oglebay Hall/ 4224 Life Sciences Building
Morgantown, WV 26506

Heike Siegmund
Department of Geological Sciences
Stable Isotope Laboratory (SIL)
Stockholm University
S-10691 Stockholm
Tel: ++46-8-6747726
Fax: ++46-8-6747897
Email: [log in to unmask]
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