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Published on: October 15, 2015
Microbial sulfate reduction at low pH in sediments of an acidic lake in Argentina
Matthias Koschorreck1, Katrin Wendt-Potthoff, Walter Geller
1Department of Inland Water Research, UFZ Centre for Environmental Research, Leipzig-Halle GmbH, Brückstrasse 3a, D-39114 Magdeburg, Germany. koschorreck@gm.ufz.de
Abstract:
We measured sulfate reduction in the acidic (pH < or = 3) sediment of an Argentinean lake influenced by volcanism. Sulfate reduction rates of 2.04 mmol m(-2) d(-1) were determined with a 35SO4(2-) core injection method and confirmed by batch incubations and from H2S measurements in the sediment. H2S production stopped when iron reduction was stimulated by addition of ferric iron. The results suggest that sulfate reduction at pH values around 3 is possible and can probably be used in biotechnological strategies if competing microbial processes are inhibited and electron donors are highly available.
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