Microbial sulfate reduction at low pH in sediments of an acidic lake in Argentina.
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.
Koschorreck
Matthias
M
Department of Inland Water Research, UFZ Centre for Environmental Research, Leipzig-Halle GmbH, Brückstrasse 3a, D-39114 Magdeburg, Germany. koschorreck@gm.ufz.de
Wendt-Potthoff
Katrin
K
Geller
Walter
W
D001118:Argentina; D001673:Biodegradation, Environmental; D019015:Geologic Sediments / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D013431:Sulfates / Q000378:metabolism*; D016999:Sulfur-Reducing Bacteria / Q000502:physiology*; D018707:Volcanic Eruptions; D014871:Water Microbiology
D013431:Sulfates; D006862:Hydrogen Sulfide