For an easy, home-made GC solution to the H2S/CO2 separation issue, to
handle samples of any size with any CO2/H2S ratio, that is clean and rapid,
consult:

Taylor, B.E. (2004)  Biogenic and thermogenic sulfate reduction in the
Sullivan Pb-Zn-Ag deposit, B.C.:  Evidence from micro-isotopic analysis of
carbonate and sulfide in bedded ores: Mayer, B. and Hutcheon, I. (eds),
Applications of Stable Isotope Techniques to Geological and Environmental
Problems, Chemical Geology, v. 204, p. 215-236.

This system is designed for off-line purification following a phosphoric
acid reaction that includes a very-efficient cryo-trapping technique.


Good-luck,

Bruce Taylor


Geological Survey of Canada
601 Booth Street
Ottawa, Ontario   CANADA   K1A 0E8

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Tel:  613-995-4673 (office); 613-992-4046 (lab)
        613-722-4845 (home)
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Personal URL
http://www.nrcan.gc.ca/gsc/mrd/bio/taylor_e.html
LSI Lab URL
http://www.nrcan.gc.ca/gsc/mrd/labs/lsilab_e.html