A Thiosulfate Shunt in the Sulfur Cycle of Marine Sediments

Details A Thiosulfate Shunt in the Sulfur Cycle of Marine Sediments A Thiosulfate Shunt in the Sulfur Cycle of Marine Sediments

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sci...249..152b&link_type=abstract

Science, Volume 249, Issue 4965, pp. 152-154

Computer Science

21

Scientific paper

The oxidation of sulfide, generated by bacterial sulfate reduction, is a key process in the biogeochemistry of marine sediments, yet the pathways and oxidants are poorly known. By the use of 35S-tracer studies of the S cycle in marine and freshwater sediments, a novel shunt function of thiosulfate (S_2O_32-) was identified. The S_2O_32- constituted 68 to 78 percent of the immediate HS^--oxidation products and was concurrently (i) reduced back to HS^-, (ii) oxidized to SO_42-, and (iii) disproportionated to HS^- + SO_42-. The small thiosulfate pool is thus involved in a dynamic HS^--S_2O_32- cycle in anoxic sediments. The disproportionation of thiosulfate may help account for the large difference in isotopic composition (34S/32S) of sulfate and sulfides in sediments and sedimentary rocks.

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