Dear Isogeochemists,

I am seeking information on two matters.


The first is Re: del 13C analysis of carbonate samples containing pyrrhotite.
I am interested in finding out how people scrub hydrogen sulfide gas from
carbonate
samples.  The gas comes from pyrrhotite contamination in the carbonate which
produces
hydrogen sulfide when reacted with orthophosphoric acid.  Lead acetate has
been suggested.

The second matter is Re: del 34S analysis of hydrogen sulfide gas.
Has anyone done analyses of this type and does anyone have any suggestions
regards conversion of hydrogen sulfide to the sulfate or the sulfide?

Any suggestions on procedure or papers to get would be appreciated.

Thanks.

Kim.


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Kim Baublys
Stable Isotope Geochemistry Laboratory
Department of Earth Sciences
University of Queensland  4072
Australia