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Title (Primary) Stable sulfur and oxygen isotope fractionation of anoxic sulfide oxidation by two different enzymatic pathways
Author Poser, A.; Vogt, C.; Knöller, K.; Ahlheim, J.; Weiss, H.; Kleinsteuber, S.; Richnow, H.-H.;
Journal Environmental Science & Technology
Year 2014
Department ISOBIO; UMB; WANA; GWS; CATHYD;
Volume 48
Issue 16
Language englisch;
POF III (all) T41;
UFZ wide themes RU3;
Abstract The microbial oxidation of sulfide is a key reaction of the microbial sulfur cycle, recycling sulfur in its most reduced valence state back to more oxidized forms usable as electron acceptors. Under anoxic conditions, nitrate is a preferential electron acceptor for this process. Two enzymatic pathways have been proposed for sulfide oxidation under nitrate reducing conditions, the sulfide:quinone oxidoreductase (SQR) pathway and the Sox (sulfur oxidation) system. In experiments with the model strains Thiobacillus denitrificans and Sulfurimonas denitrificans, both pathways resulted in a similar small sulfur and oxygen isotope fractionation of −2.4 to −3.6‰ for 34S and −2.4 to −3.4‰ for 18O. A similar pattern was detected during the oxidation of sulfide in a column percolated with sulfidic, nitrate amended groundwater. In experiments with 18O-labeled water, a strong oxygen isotope fractionation was observed for T. denitrificans and S. denitrificans, indicating a preferential incorporation of 18O-depleted oxygen released as water by nitrate reduction to nitrogen. The study indicates that nitrate-dependent sulfide oxidation might be monitored in the environment by analysis of 18O-depleted sulfate.
ID 15217
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15217
Poser, A., Vogt, C., Knöller, K., Ahlheim, J., Weiss, H., Kleinsteuber, S., Richnow, H.-H. (2014):
Stable sulfur and oxygen isotope fractionation of anoxic sulfide oxidation by two different enzymatic pathways
Environ. Sci. Technol. 48 (16), 9094 - 9102