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A Thiosulfate Shunt in the Sulfur Cycle of Marine Sediments
Abstract
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 35 S-tracer studies of the S cycle in marine and freshwater sediments, a novel shunt function of thiosulfate (S 2 O 3 2- ) was identified. The S 2 O 3 2- constituted 68 to 78 percent of the immediate HS - -oxidation products and was concurrently (i) reduced back to HS - , (ii) oxidized to SO 4 2- , and (iii) disproportionated to HS - + SO 4 2- . The small thiosulfate pool is thus involved in a dynamic HS - - S 2 O 3 2- cycle in anoxic sediments. The disproportionation of thiosulfate may help account for the large difference in isotopic composition ( 34 S/ 32 S) of sulfate and sulfides in sediments and sedimentary rocks.
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Arndt, S., Jørgensen, B. B., LaRowe, D. E., Middelburg, J. J., Pancost, R. D., & Regnier, P. (2013) · Earth-Science Reviews · doi:10.1016/j.earscirev.2013.02.008 · Cited by 1,040
Self-citationProducts and distinguishing criteria of bacterial and thermochemical sulfate reduction
Machel, H. G., Krouse, H. R., & Sassen, R. (1995) · Applied Geochemistry · doi:10.1016/0883-2927(95)00008-8 · Cited by 890
Canfield, D. E., & Teske, A. (1996) · Nature · doi:10.1038/382127a0 · Cited by 869
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Och, L. M., & Shields-Zhou, G. A. (2012) · Earth-Science Reviews · doi:10.1016/j.earscirev.2011.09.004 · Cited by 646
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Metadata
- Authors
- Jørgensen, B. B.
- Venue
- Science
- Published
- 1990-07-13
- Volume
- 249
- Issue
- 4965
- Pages
- 152-154
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2147521920
- Cited by
- 488
- References
- 0
- FWCI
- 14.80
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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