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

Alexander Poser, Carsten Vogt, Kay Knöller, D. Sorokin, Kai W. Finster, Hans H. Richnow

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
59 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)934-941
Number of pages8
JournalGeomicrobiology Journal: an international journal of geomicrobiology and microbial biogeochemistry
Volume33
Issue number10
DOIs
Publication statusPublished - 25 Nov 2016

Keywords

  • Soda lakes
  • sulfate formation
  • sulfide formation

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