Our lab uses Sulfix, 8-20 mesh, from Wako. (We order it in
Germany, Wako Chemicals). We freeze the CO2 into a glass tube,
together with a few grains of sulfix. The tube is sealed and placed in
an oven at 480 C. during several hours. It is a bit time-consuming,
but the material works very well.
We are currently
working on some carbonate samples containing a relatively
high S content. Thus the CO2 we extracted through phosporic
acid digestion ends up with a very annoying S contamination,
which was confirmed by the mass scan of the sample. At this moment,
the exact nature of the contaminant hasn't been identified,
presumably H2S or SO2. We have already
tried several purification methods, including
cryogenic separation, reacting with silver wire, GC
separation etc. So far, the results are
not satisfactory. I wonder whether anyone can give me
some more hints on this problem. (The sample size we are dealing
with is usually around 60 micromoles.)
Any suggestions and comments from you
will be highly appreciated.
Centre for Isotope Research, University of Groningen.
Centrum voor IsotopenOnderzoek (CIO), Rijksuniversiteit Groningen
Nijenborgh 4, 9747 AG Groningen, Netherlands
tel +31-50-3634716 fax +31-50-3634738