Hi Bill,

I have been running SO2 (periodically), on the same tank for the last four
years and the gauge hasn't moved from just above zero, which was
disconcerting in the beginning. The cylinder size is P code 172.  Prior to
moving to CF for sulfur I used a little finger cylinder for ten years on my
dual inlet and it still has gas.  So I think that they are like the magic
pudding, in that it never runs out :)  Or it could be just due to the low
vapour pressure of the SO2.

Cheers
Kim


At 08:41 AM 7/10/2004 -0400, you wrote:
>Ok, back to some isotope stuff -
>
>For those of you using ref. gas injection systems for EA-CF-IRMS
>analysis of sulfur, how long does a a typical size reference gas tank
>last?  The reason I ask, is that these SO2 tanks have a very low
>pressure.  And, does anyone recommend a supplier in the states?
>
>Thanks in advance,
>
>Bill Anderson
>
>William Anderson
>Assistant Professor
>Earth Sciences Department and Southeast Environmental Research Center
>Florida International University


Kim Baublys
Stable Isotope Laboratories
Department Of Earth Sciences
University of Queensland 4072
Australia

Ph:   +61 7 3365 1131
Fax: +61 7 3365 1277
http://www.uq.edu.au/geochem/