Abiotic reductive immobilization of U(VI) by biogenic mackinawite

Harish Veeramani, Andreas C. Scheinost, Niven Monsegue, Nikolla P. Qafoku, Ravi Kukkadapu, Matt Newville, Antonio Lanzirotti, Amy Pruden, Mitsuhiro Murayama, Michael F. Hochella

Research output: Contribution to journalArticlepeer-review

106 Citations (Scopus)


During subsurface bioremediation of uranium-contaminated sites, indigenous metal and sulfate-reducing bacteria may utilize a variety of electron acceptors, including ferric iron and sulfate that could lead to the formation of various biogenic minerals in situ. Sulfides, as well as structural and adsorbed Fe(II) associated with biogenic Fe(II)-sulfide phases, can potentially catalyze abiotic U(VI) reduction via direct electron transfer processes. In the present work, the propensity of biogenic mackinawite (Fe1+xS, x = 0 to 0.11) to reduce U(VI) abiotically was investigated. The biogenic mackinawite produced by Shewanella putrefaciens strain CN32 was characterized by employing a suite of analytical techniques including TEM, SEM, XAS, and Mössbauer analyses. Nanoscale and bulk analyses (microscopic and spectroscopic techniques, respectively) of biogenic mackinawite after exposure to U(VI) indicate the formation of nanoparticulate UO2. This study suggests the relevance of sulfide-bearing biogenic minerals in mediating abiotic U(VI) reduction, an alternative pathway in addition to direct enzymatic U(VI) reduction.

Original languageEnglish
Pages (from-to)2361-2369
Number of pages9
JournalEnvironmental Science and Technology
Issue number5
Publication statusPublished - Mar 5 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry


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