Direct and Mn-Controlled Indirect Iron Oxidation by Leptothrix discophora SS-1 and Leptothrix cholodnii

Direct biotic and homogeneous abiotic Fe(II) oxidation rates as well as oxidation rates of Fe(II) with MnO X were determined in laboratory experiments and compared with biotic Mn(II) oxidation rates. In groundwaters and thermal installation waters, parameters for both Fe(II) oxidation steps were stu...

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Published inGeomicrobiology journal Vol. 32; no. 10; pp. 934 - 943
Main Authors Eggerichs, Tanja, Otte, Tobias, Opel, Oliver, Ruck, Wolfgang K. L.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 26.11.2015
Subjects
biogenic manganese oxides
biogeochemical cycling
iron-oxidizing bacteria
Leptothrix
manganese-oxidizing bacteria
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Summary:Direct biotic and homogeneous abiotic Fe(II) oxidation rates as well as oxidation rates of Fe(II) with MnO X were determined in laboratory experiments and compared with biotic Mn(II) oxidation rates. In groundwaters and thermal installation waters, parameters for both Fe(II) oxidation steps were studied and products of biotic and abiotic Fe(II) and Mn(II) oxidation were analyzed. Direct Fe(II) oxidation of active Leptothrix cholodnii cultures can reach first-order rates of up to 1.17 ± 0.90 h −1 . Second-order rates of Fe(II) oxidation with biogenic, Leptothrix-cholodnii- and Leptothrix-discophora-SS-1-originating MnO X lead to rates comparable with those as obtained with abiotic H + -birnessite.
ISSN:0149-0451
1521-0529
DOI:10.1080/01490451.2015.1039671