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Kai Finster

Sulfur and Oxygen Isotope Fractionation During Bacterial Sulfur Disproportionation Under Anaerobic Haloalkaline Conditions

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  • Alexander Poser, UFZ Helmholtz Ctr Environm Res, Helmholtz Association, UFZ Helmholtz Center for Environmental Research, Dept Isotope Biogeochem
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  • Carsten Vogt, UFZ Helmholtz Ctr Environm Res, Helmholtz Association, UFZ Helmholtz Center for Environmental Research, Dept Isotope Biogeochem
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  • Kay Knoeller, UFZ Helmholtz Ctr Environm Res, Helmholtz Association, UFZ Helmholtz Center for Environmental Research, Dept Catchment Hydrol
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  • Dimitry Y. Sorokin, Delft Univ Technol, Delft University of Technology, Dept Biotechnol
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  • Kai W. Finster
  • Hans-H. Richnow, UFZ Helmholtz Ctr Environm Res, Helmholtz Association, UFZ Helmholtz Center for Environmental Research, Dept Isotope Biogeochem

Sulfur and oxygen isotope fractionation of elemental sulfur disproportionation at anaerobic haloalkaline conditions was evaluated for the first time. Isotope enrichment factors of the strains Desulfurivibrio alkaliphilus and Dethiobacter alkaliphilus growing at pH 9 or 10 were -0.9 parts per thousand to -1 parts per thousand for sulfide (E-34), +3.6 parts per thousand to +4.7 parts per thousand for sulfate (E-34), and +3.5 parts per thousand to +7.7 parts per thousand for oxygen in sulfate (E-18). These values are significantly smaller compared to previously published values of sulfur disproportionators at neutral pH. We propose that this discrepancy is caused by masking effects due to preferential formation of polysulfides at high pH leading to accelerated internal sulfur turnover rates, but cannot rule out distinct isotope effects due to specific enzymatic disproportionation reactions under haloalkaline conditions. The results imply that the microbial sulfur cycle in haloalkaline environments is characterized by specific stable sulfur and oxygen isotope patterns.

OriginalsprogEngelsk
TidsskriftGeomicrobiology Journal
Vol/bind33
Nummer10
Sider (fra-til)934-941
Antal sider8
ISSN0149-0451
DOI
StatusUdgivet - 2016

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