HI all,


I'm curious about sulfur isotope fractionation by Thiobacillus a sulfide
oxidizer.  The 1964 paper by Kaplan and Rittenberg reported a -20 permil
fractionation by Thiobacillus thiooxidans upon converting aqueous sulfide
to sulfate.  I haven't seen any more recent publications about this.  Such
a large fractionation would seem to imply that under circumstances where
these organisms are active, the isotopic signature of sulfide would be
heavier than the corresponding sulfate (not usually the case).  Has this
ever been observed?  Cheers, tco


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