Impact of biostimulated redox processes on metal dynamics in an iron-rich creek soil of a former uranium mining area

Environmental Science & Technology
Eva-Maria BurkhardtKirsten Küsel

Abstract

Understanding the dynamics of metals and radionuclides in soil environments is necessary for evaluating risks to pristine sites. An iron-rich creek soil of a former uranium-mining district (Ronneburg, Germany) showed high porewater concentrations of heavy metals and radionuclides. Thus, this study aims to (i) evaluate metal dynamics during terminal electron accepting processes (TEAPs) and (ii) characterize active microbial populations in biostimulated soil microcosms using a stable isotope probing (SIP) approach. In biostimulated soil slurries, concentrations of soluble Co, Ni, Zn, As, and unexpectedly U increased during Fe(III)-reduction. This suggests that there was a release of sorbed metals and As during reductive dissolution of Fe(III)-oxides. Subsequent sulfate-reduction was concurrent with a decrease of U, Co, Ni, and Zn concentrations. The relative contribution of U(IV) in the solid phase changed from 18.5 to 88.7% after incubation. The active Fe(III)-reducing population was dominated by delta-Proteobacteria (Geobacter) in (13)C-ethanol amended microcosms. A more diverse community was present in (13)C-lactate amended microcosms including taxa related to Acidobacteria, Firmicutes, delta-Proteobacteria, and beta-Proteobac...Continue Reading

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Citations

Sep 17, 2013·The Journal of Microbiology·Nurul H KhanDarren R Korber
Apr 7, 2010·Applied and Environmental Microbiology·Jana SitteKirsten Küsel
Mar 8, 2011·Applied and Environmental Microbiology·Eva-Maria BurkhardtKirsten Küsel
Jul 1, 2015·Environmental Science and Pollution Research International·Jana SitteKirsten Küsel
May 25, 2011·Journal of Microbiological Methods·Romy ChakrabortyTamas Torok
Oct 21, 2014·Environmental Science & Technology·Valerie K StuckerJames F Ranville
Feb 18, 2018·Applied and Environmental Microbiology·Adam C MumfordIsabelle M Cozzarelli
May 17, 2015·Applied and Environmental Microbiology·Michael P ThorgersenMichael W W Adams
Dec 7, 2019·Environmental Science and Pollution Research International·Xiang FeiWeili Zhou
Nov 8, 2020·Applied and Environmental Microbiology·Toshiyuki Ueki
Jul 22, 2019·Environment International·Chenchen QuQiaoyun Huang
Jan 14, 2011·Environmental Science & Technology·Lee J KerkhofLora R McGuinness
Nov 11, 2014·Environmental Science & Technology·Lyndsay D TroyerThomas Borch
Feb 5, 2013·Environmental Science & Technology·Harish VeeramaniMichael F Hochella
Oct 22, 2020·Environmental Science & Technology·Arindam MalakarChittaranjan Ray

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