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Science 23 December 1994:
Vol. 266. no. 5193, pp. 1973 - 1975
DOI: 10.1126/science.11540246
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Articles

Science, Vol 266, Issue 5193, 1973-1975
Copyright © 1994 by American Association for the Advancement of Science

articles

The production of 34S-depleted sulfide during bacterial disproportionation of elemental sulfur

DE Canfield and B Thamdrup

Max Planck Institute for Marine Microbiology, Bremen, Germany.

Bacteria that disproportionate elemental sulfur fractionate sulfur isotopes such that sulfate is enriched in sulfur-34 by 12.6 to 15.3 per mil and sulfide is depleted in sulfur-34 by 7.3 to 8.6 per mil. Through a repeated cycle of sulfide oxidation to S0 and subsequent disproportionation, these bacteria can deplete sedimentary sulfides in sulfur-34. A prediction, borne out by observation, is that more extensive sulfide oxidation will lead to sulfides that are more depleted in sulfur-34. Thus, the oxidative part of the sulfur cycle creates circumstances by which sulfides become more depleted in sulfur-34 than would be possible with sulfate-reducing bacteria alone.


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