Anoxie transformations of radiolabeled hydrogen sulfide in marine and freshwater sediments

Details Anoxie transformations of radiolabeled hydrogen sulfide in marine and freshwater sediments Anoxie transformations of radiolabeled hydrogen sulfide in marine and freshwater sediments

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2425e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 6, pp.2425-2435

Physics

6

Scientific paper

Radiolabeled hydrogen sulfide (H 35 S - ) was used to trace the anoxic sulfur transformations in marine and freshwater sediment slurries. Time course studies consistently showed a rapid 35 S 2 O 3 - formation and a progressive accumulation of 35 SO 4 - and thus indicated an anoxic sulfide oxidation to sulfate. Thiosulfate was partly turned over by oxidation or disproportionation and was found to be an intermediate in the 35 SO 4 - formation. The results demonstrate that oxidative and reductive sulfur cycling may occur simultaneously in marine and freshwater sediments. When added as exogenous oxidant, nitrate (NO 3 - ) stimulated the anoxic sulfide oxidation to sulfate. Ferric iron, added in the form of lepidocrocite ( -FeOOH), caused the precipitation of iron sulfides and only partial sulfide oxidation to pyrite and elemental sulfur.

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