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dc.contributor.authorFritzsche, Andreasen_UK
dc.contributor.authorBosch, Julianen_UK
dc.contributor.authorSander, Michaelen_UK
dc.contributor.authorSchroeder, Christianen_UK
dc.contributor.authorByrne, James Men_UK
dc.contributor.authorRitschel, Thomasen_UK
dc.contributor.authorJoshi, Prachien_UK
dc.contributor.authorMaisch, Markusen_UK
dc.contributor.authorMeckenstock, Rainer Uen_UK
dc.contributor.authorKappler, Andreasen_UK
dc.contributor.authorTotsche, Kai Uen_UK
dc.description.abstractMicrobial reduction of Fe(III) minerals is a prominent process in redoximorphic soils and is strongly affected by organic matter (OM). We herein determined the rate and extent of microbial reduction of ferrihydrite (Fh) with either adsorbed or coprecipitated OM by Geobacter sulfurreducens. We focused on OM-mediated effects on electron uptake and alterations in Fh crystallinity. The OM was obtained from anoxic soil columns (effluent OM, efOM) and included –unlike water-extractable OM– compounds released by microbial activity under anoxic conditions. We found that organic molecules in efOM had generally no or only very low electron- accepting capacity and were incorporated into the Fh aggregates when coprecipitated with Fh. Compared to OM-free Fh, adsorption of efOM to Fh decelerated the microbial Fe(III) reduction by passivating the Fh surface towards electron uptake. In contrast, coprecipitation of Fh with efOM accelerated the microbial reduction, likely because efOM disrupted the Fh structure as noted by Mössbauer spectroscopy. Additionally, adsorbed and co-precipitated efOM resulted in a more sustained Fe(III) reduction, potentially because efOM could have effectively scavenged biogenic Fe(II) and prevented the passivation of the Fh surface by adsorbed Fe(II). Fe(III)-OM coprecipitates forming at anoxic-oxic interfaces are thus likely readily reducible by Fe(III)- reducing bacteria in redoximorphic soils.en_UK
dc.publisherAmerican Chemical Societyen_UK
dc.relationFritzsche A, Bosch J, Sander M, Schroeder C, Byrne JM, Ritschel T, Joshi P, Maisch M, Meckenstock RU, Kappler A & Totsche KU (2021) Organic matter from redoximorphic soils accelerates and sustains microbial Fe(III) reduction. Environmental Science and Technology, 55 (15), pp. 10821-10831.
dc.rightsThis item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
dc.subjectMössbauer spectroscopyen_UK
dc.subjectmediated electrochemical reductionen_UK
dc.subjectelectron-accepting capacityen_UK
dc.subjectiron oxideen_UK
dc.subjectdissolved organic matteren_UK
dc.titleOrganic matter from redoximorphic soils accelerates and sustains microbial Fe(III) reductionen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreason[es-2021-01183k.R3_Proof_hi.pdf] Publisher requires embargo of 12 months after publication.en_UK
dc.citation.jtitleEnvironmental Science and Technologyen_UK
dc.type.statusNA - Not Applicable (or Unknown)en_UK
dc.type.statusAM - Accepted Manuscripten_UK
dc.contributor.affiliationFriedrich Schiller University of Jenaen_UK
dc.contributor.affiliationGerman Research Center for Environmental Healthen_UK
dc.contributor.affiliationETH Zurichen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationUniversity of Bristolen_UK
dc.contributor.affiliationFriedrich Schiller University of Jenaen_UK
dc.contributor.affiliationUniversity of Tuebingen (Eberhard Karls)en_UK
dc.contributor.affiliationUniversity of Tuebingen (Eberhard Karls)en_UK
dc.contributor.affiliationGerman Research Center for Environmental Healthen_UK
dc.contributor.affiliationUniversity of Tuebingen (Eberhard Karls)en_UK
dc.contributor.affiliationFriedrich Schiller University of Jenaen_UK
rioxxterms.apcnot requireden_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorFritzsche, Andreas|en_UK
local.rioxx.authorBosch, Julian|en_UK
local.rioxx.authorSander, Michael|en_UK
local.rioxx.authorSchroeder, Christian|0000-0002-7935-6039en_UK
local.rioxx.authorByrne, James M|en_UK
local.rioxx.authorRitschel, Thomas|en_UK
local.rioxx.authorJoshi, Prachi|en_UK
local.rioxx.authorMaisch, Markus|en_UK
local.rioxx.authorMeckenstock, Rainer U|en_UK
local.rioxx.authorKappler, Andreas|en_UK
local.rioxx.authorTotsche, Kai U|en_UK
local.rioxx.projectInternal Project|University of Stirling|
Appears in Collections:Biological and Environmental Sciences Journal Articles

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