Dear Kim,

with respect to the stable sulfur isotope analysis of hydrogen 
sulfide:
You just have to trap the gas quantitatively (!!!) in an aqueous 
solution of Cd-acetate (or Cd-formiate). You 
have to convert the CdS into Ag2S (addition of AgNO3 solution) and 
convert it into SO2 in the classical way for a double-inlet 
maschine (V2O5) or use it directly for combustion if you have a C-
irmMS system.

Cheers
Michael

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Dr. Michael E. Boettcher
Institute of Chemistry and 
Biology of the Marine Environment (ICBM)
Carl von Ossietzky University
P.O. Box 2503
D-26111 Oldenburg
FRG
Phone: (+49) 441-798-3403 (Isotope Lab.)
                     2534 (prediction central)
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