A thiosulfate shunt in the sulfur cycle of marine sediments
Journal Article
·
· Science (Washington, D.C.); (USA)
- Univ. of Aarhus (Denmark)
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 {sup 35}S-tracer studies of the S cycle in marine and freshwater sediments, a novel shunt function of thiosulfate (S{sub 2}O{sub 3}{sup 2{minus}}) was identified. The S{sub 2}O{sub 3}{sup 2{minus}} constituted 68 to 78% of the immediate HS{sup {minus}}-oxidation products and was concurrently reduced back to HS{sup {minus}}, oxidized to SO{sub 4}{sup 2{minus}}, and disproportionated to HS{sup {minus}} + SO{sub 4}{sup 2{minus}}. The small thiosulfate pool is thus involved in a dynamic HS{sup {minus}}-S{sub 2}O{sub 3}{sup 2{minus}} cycle in anoxic sediments. The disproportionation of thiosulfate may help account for the large difference in isotopic composition of sulfate and sulfides in sediments and sedimentary rocks.
- OSTI ID:
- 6369636
- Journal Information:
- Science (Washington, D.C.); (USA), Journal Name: Science (Washington, D.C.); (USA) Vol. 249:4965; ISSN SCIEA; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:370481
Related Subjects
54 ENVIRONMENTAL SCIENCES
540311 -- Environment
Aquatic-- Basic Studies-- Radiometric Techniques-- (1990-)
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ANOXIA
BACTERIA
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOGEOCHEMISTRY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DAYS LIVING RADIOISOTOPES
EVEN-ODD NUCLEI
FRESH WATER
GEOCHEMISTRY
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MICROORGANISMS
NUCLEI
OXYGEN COMPOUNDS
RADIOISOTOPES
REDOX REACTIONS
SEAS
SEDIMENTS
SULFATE-REDUCING BACTERIA
SULFATES
SULFIDES
SULFUR 35
SULFUR COMPOUNDS
SULFUR CYCLE
SULFUR ISOTOPES
SURFACE WATERS
THIOSULFATES
TRACER TECHNIQUES
WATER
WATER CHEMISTRY
540311 -- Environment
Aquatic-- Basic Studies-- Radiometric Techniques-- (1990-)
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ANOXIA
BACTERIA
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOGEOCHEMISTRY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DAYS LIVING RADIOISOTOPES
EVEN-ODD NUCLEI
FRESH WATER
GEOCHEMISTRY
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MICROORGANISMS
NUCLEI
OXYGEN COMPOUNDS
RADIOISOTOPES
REDOX REACTIONS
SEAS
SEDIMENTS
SULFATE-REDUCING BACTERIA
SULFATES
SULFIDES
SULFUR 35
SULFUR COMPOUNDS
SULFUR CYCLE
SULFUR ISOTOPES
SURFACE WATERS
THIOSULFATES
TRACER TECHNIQUES
WATER
WATER CHEMISTRY