Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction

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dc.contributor.author Kulkarni, Harshad V.
dc.contributor.author Mladenov, Natalie
dc.contributor.author McKnight, Diane M.
dc.contributor.author Zheng, Yan
dc.contributor.author Kirk, Matthew F.
dc.contributor.author Nemergut, Diana R.
dc.date.accessioned 2017-11-09T17:33:22Z
dc.date.available 2017-11-09T17:33:22Z
dc.identifier.uri http://hdl.handle.net/2097/38185
dc.description Citation: Harshad V. Kulkarni, Natalie Mladenov, Diane M. McKnight, Yan Zheng, Matthew F. Kirk, Diana R. Nemergut, Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction, In Science of The Total Environment, 615, 1390-1395, https://doi.org/10.1016/j.scitotenv.2017.09.164
dc.description.abstract It was demonstrated more than two decades ago that microorganisms use humic substances, including fulvic acid (FA), as electron shuttles during iron (Fe) reduction in anaerobic soils and sediments. The relevance of this mechanism for the acceleration of Fe(III) reduction in arsenic-laden groundwater environments is gaining wider attention. Here we provide new evidence that dissolved FAs isolated from sediment-influenced surface water and groundwater in the Bengal Basin were capable of electron shuttling between Geobacter metallireducens and Fe(III). Moreover, all four Bangladesh sediment-derived dissolved FAs investigated in this study had higher electron accepting capacity (176 to 245 μmol/g) compared to aquatic FAs, such as Suwanee River Fulvic Acid (67 μmol/g). Our direct evidence that Bangladesh FAs are capable of intermediate electron transfer to Fe(III) supports other studies that implicate electron shuttling by sediment-derived aqueous humics to enhance Fe reduction and, in turn, As mobility. Overall, the finding of greater electron accepting capacity by dissolved FAs from groundwater and other sediment-influenced environments advances our understanding of mechanisms that control Fe reduction under conditions where electron transfer is the rate limiting step.
dc.relation.uri https://doi.org/10.1016/j.scitotenv.2017.09.164
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject Iron
dc.subject Arsenic
dc.subject Organic matter
dc.subject Bacteria
dc.subject Fulvic acid
dc.subject Groundwater
dc.title Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction
dc.type Article
dc.date.published 2018
dc.citation.doi 10.1016/j.scitotenv.2017.09.164
dc.citation.epage 1395
dc.citation.issn 0048-9697
dc.citation.jtitle Science of The Total Environment
dc.citation.spage 1390
dc.citation.volume 615
dc.description.embargo 2019-10-17
dc.contributor.authoreid harshad
dc.contributor.authoreid mfkirk
dc.contributor.kstate Kulkarni, Harshad V.
dc.contributor.kstate Kirk, Matthew F.

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Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) Except where otherwise noted, the use of this item is bound by the following: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

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