Print Email Facebook Twitter Sulfur and Oxygen Isotope Fractionation During Bacterial Sulfur Disproportionation Under Anaerobic Haloalkaline Conditions Title Sulfur and Oxygen Isotope Fractionation During Bacterial Sulfur Disproportionation Under Anaerobic Haloalkaline Conditions Author Poser, Alexander (Helmholtz Centre for Environmental Research - UFZ) Vogt, Carsten (Helmholtz Centre for Environmental Research - UFZ) Knöller, Kay (Helmholtz Centre for Environmental Research - UFZ) Sorokin, Dimitry Y. (TU Delft BT/Environmental Biotechnology; Russian Academy of Sciences) Finster, Kai W. (Aarhus University) Richnow, Hans H. (Helmholtz Centre for Environmental Research - UFZ) Date 2016-11-25 Abstract 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‰ to −1‰ for sulfide (34ϵ), +3.6‰ to +4.7‰ for sulfate (34ϵ), and +3.5‰ to +7.7‰ for oxygen in sulfate (18ϵ). 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. Subject Soda lakessulfate formationsulfide formation To reference this document use: http://resolver.tudelft.nl/uuid:7de8a985-67d7-4c66-8210-38029dc3eb23 DOI https://doi.org/10.1080/01490451.2015.1128993 Embargo date 2017-01-12 ISSN 0149-0451 Source Geomicrobiology Journal: an international journal of geomicrobiology and microbial biogeochemistry, 33 (10), 934-941 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2016 Alexander Poser, Carsten Vogt, Kay Knöller, Dimitry Y. Sorokin, Kai W. Finster, Hans H. Richnow Files PDF 9365286_Sulfur_and_oxygen ... J_2016.pdf 386.18 KB Close viewer /islandora/object/uuid:7de8a985-67d7-4c66-8210-38029dc3eb23/datastream/OBJ/view