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Dear Weifu, 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. Good luck. Anita >Hi, Everyone > > 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. > >Regards >Weifu -- Anita Aerts-Bijma 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 http://www.rug.nl/cio