Effect of Reduced Sulfur Species on Chemolithoautotrophic Pyrite Oxidation with Nitrate
journal contribution
posted on 2018-11-27, 09:09 authored by Ruiwen Yan, Andreas Kappler, E. Marie Muehe, Klaus-Holger Knorr, Marcus A. Horn, Alexander Poser, Regina Lohmayer, Stefan Peiffer<p>We compared the response at neutral pH of some denitrifiers to different electron donors such as reduced sulfur (pyrite, S(0), and marcasite) and reduced Fe. Chemolithoautotrophic oxidation of pyrite with nitrate as electron acceptor was not possible when the pyrite was in a pure crystalline form, whereas oxidation of synthesized FeS<sub>2</sub> of low crystallinity and of S(0) with nitrate as electron acceptor was possible. Neither nitrite nor sulfate was formed when Fe(II)-oxidizing strain <i>Acidovorax</i> sp. BoFeN1 was tested. Microbial reduction of nitrate appears to be induced via S oxidation but not via Fe oxidation.</p>
Funding
This work was funded by the research group FOR 580 of the German Research Foundation (DFG) “Electron Transfer Processes in Anoxic Aquifers.”
History
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