Anaerobic, nitrate-dependent oxidation of pyrite nanoparticles by thiobacillus denitrificans

Julian Bosch, Keun Young Lee, Guntram Jordan, Kyoung Woong Kim, Rainer U. Meckenstock

Research output: Contribution to journalArticlepeer-review

131 Scopus citations

Abstract

Pyrite is a key mineral in the global biogeochemical cycles of sulfur and iron, yet its anaerobic microbial oxidation has eluded geochemists and microbiologists for decades. Recent reports indicated that anaerobic oxidation of pyrite is occurring, but the mechanism remains unclear. Here, we provide evidence for the capability of Thiobacillus denitrif icans to anaerobically oxidize a putatively nanosized pyrite particle fraction with nitrate as electron acceptor. Nanosized pyrite was readily oxidized to ferric iron and sulfate with a rate of 10.1 μM h -1. The mass balance of pyrite oxidation and nitrate reduction revealed a closed recovery of the electrons. This substantiates a further "missing lithotrophy" in the global cycles of sulfur and iron and emphasizes the high reactivity of nanominerals in the environment.

Original languageEnglish
Pages (from-to)2095-2101
Number of pages7
JournalEnvironmental Science and Technology
Volume46
Issue number4
DOIs
StatePublished - 21 Feb 2012
Externally publishedYes

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