Publication Details

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Title (Primary) Sulfur and oxygen isotope fractionation during bacterial sulfur disproportionation under anaerobic haloalkaline conditions
Author Poser, A.; Vogt, C.; Knöller, K.; Sorokin, D.Y.; Finster, K.W.; Richnow, H.-H.;
Journal Geomicrobiology Journal
Year 2016
Department ISOBIO; CATHYD;
Volume 33
Issue 10
Language englisch;
POF III (all) T41;
Keywords Soda lakes, sulfate formation, sulfide formation
UFZ wide themes RU3;
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.
ID 18122
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=18122
Poser, A., Vogt, C., Knöller, K., Sorokin, D.Y., Finster, K.W., Richnow, H.-H. (2016):
Sulfur and oxygen isotope fractionation during bacterial sulfur disproportionation under anaerobic haloalkaline conditions
Geomicrobiol. J. 33 (10), 934 - 941