Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of Fe<sup>III</sup>-Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam)

Głodowska, Martyna; Stopelli, Emiliano; Schneider, M.; Lightfoot, Alexandra; Rathi, Bhasker; Straub, Daniel; Patzner, Monique; Duyen, Vu Thi; Berg, Michael; Kleindienst, Sara; Kappler, Andreas

doi:10.1021/acs.est.9b07183

Cited by 64 publications

(33 citation statements)

References 77 publications

(171 reference statements)

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“…Fe(III)-reducing bacteria such as Geobacter, however, require bioavailable carbon (C) for their activity 11,12 . Previous studies focused on the identity and source of organic compounds used for microbial As mobilization [13][14][15][16] ; however, the role of methane (CH 4 ) remained unexplored. Here we investigated whether CH 4 , which is abundant in these aquifers, can also be a potential energy source and drive microbially mediated Fe(III)-mineral reduction leading to As mobilization.…”

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confidence: 99%

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Straub

Jetten

Głodowska

et al. 2020

Commun Earth Environ

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Arsenic groundwater contamination threatens the health of millions of people worldwide, particularly in South and Southeast Asia. In most cases, the release of arsenic from sediment was caused by microbial reductive dissolution of arsenic-bearing iron(III) minerals with organic carbon being used as microbial electron donor. Although in many arsenic-contaminated aquifers high concentrations of methane were observed, its role in arsenic mobilization is unknown. Here, using microcosms experiments and hydrogeochemical and microbial community analyses, we demonstrate that methane functions as electron donor for methanotrophs, triggering the reductive dissolution of arsenic-bearing iron(III) minerals, increasing the abundance of genes related to methane oxidation, and ultimately mobilizing arsenic into the water. Our findings provide evidence for a methane-mediated mechanism for arsenic mobilization that is distinct from previously described pathways. Taking this together with the common presence of methane in arsenic-contaminated aquifers, we suggest that this methane-driven arsenic mobilization may contribute to arsenic contamination of groundwater on a global scale.

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confidence: 99%

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Straub

Jetten

Głodowska

et al. 2020

Commun Earth Environ

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“…Enrichment of Geobacter and some of the sulfate-reducing taxa may reflect use of acetate as the electron donor in our aqueous media. Previous sediment bioreactor studies that also observed enrichment of Geobacter when acetate was provided include Lentini et al (2012), Kirk et al (2013), Hori et al (2015, and Glodowska et al (2020). Similarly, the genera Desulfobacca, Desulfobacter, and Desulfobacterium contain species capable of oxidizing acetate (Brandis-Heep et al, 1983;Oude Elferink et al, 1999;Schauder et al, 1986).…”

Section: Potential Roles Of Microbial Populationsmentioning

confidence: 86%

Influences of pH and substrate supply on the ratio of iron to sulfate reduction

et al. 2021

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Iron reduction and sulfate reduction often occur simultaneously in anoxic systems, and where that is the case, the molar ratio between the reactions (i.e., Fe/SO 4 2− reduced) influences their impact on water quality and carbon storage. Previous research has shown that pH and the supply of electron donors and acceptors affect that ratio, but it is unclear how their influences compare and affect one another. This study examines impacts of pH and the supply of acetate, sulfate, and goethite on the ratio of iron to sulfate reduction in semi-continuous sediment bioreactors. We examined which parameter had the greatest impact on that ratio and whether the parameter influences depended on the state of each other. Results show that pH had a greater influence than acetate supply on the ratio of iron to sulfate reduction, and that the impact of acetate supply on the ratio depended on pH. In acidic reactors (pH 6.0 media), the ratio of iron to sulfate reduction decreased from 3:1 to 2:1 as acetate supply increased (0-1 mM). In alkaline reactors (pH 7.5 media), iron and sulfate were reduced in equal proportions, regardless of acetate supply. Secondly, a comparison of experiments with and without sulfate shows that the extent of iron reduction was greater if sulfate reduction was occurring and that the effect was larger in alkaline reactors than acidic reactors. Thus, the influence of sulfate supply on iron reduction extent also depended on pH and suggests that iron reduction grows more dependent on sulfate reduction as pH increases. Our results compare well to trends in groundwater geochemistry and provide further evidence that pH is a major control on iron and sulfate reduction in systems with crystalline (oxyhydr)oxides. pH not only affects the ratio between the reactions but also the influences of other parameters on that ratio.

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“…After incubation, Eh of CD, CS, and YT slurries declined to −207.4, −249.2, and −267.2 mV, respectively, and became metastable afterward (Figure S1a), as previously reported. 36 The decline was shorter than that occurring under in situ conditions, 37 probably because grinding and sieving soil samples altered their bioavailable carbon sources and microbial communities. Both the pH and Eh were metastable during redox cycles (Figure S1b−d).…”

Section: Methodsmentioning

confidence: 98%

Active Iron Phases Regulate the Abiotic Transformation of Organic Carbon during Redox Fluctuation Cycles of Paddy Soil

Chen

et al. 2021

Environ. Sci. Technol.

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Iron (Fe) phases are tightly linked to the preservation rather than the loss of organic carbon (OC) in soil; however, during redox fluctuations, OC may be lost due to Fe phase-mediated abiotic processes. This study examined the role of Fe phases in driving hydroxyl radical (•OH) formation and OC transformation during redox cycles in paddy soils. Chemical probes, sequential extraction, and Mössbauer analyses showed that the active Fe species, such as exchangeable and surface-bound Fe and Fe in low-crystalline minerals (e.g., green rust-like Fe phases), predominantly regulated •OH formation during redox cycles. The •OH oxidation strongly induced the oxidative transformation of OC, which accounted for 15.1–30.8% of CO2 production during oxygenation. Microbial processes contributed 7.3–12.1% of CO2 production, as estimated by chemical quenching and γ-irradiation experiments. After five redox cycles, 30.1–71.9% of the OC associated with active Fe species was released, whereas 5.2–7.1% was stabilized by high-crystalline Fe phases due to the irreversible transformation of these active Fe species during redox cycles. Collectively, our findings might unveil the under-appreciated role of active Fe phases in driving more loss than conservation of OC in soil redox fluctuation events.

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Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of Fe^III-Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam)

Abstract: A. (2020). Role of in situ natural organic matter in mobilizing as during microbial reduction of FeIII-mineral-bearing aquifer sediments from Hanoi (Vietnam). Environmental Science and Technology.

Cited by 64 publications

References 77 publications

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Influences of pH and substrate supply on the ratio of iron to sulfate reduction

Active Iron Phases Regulate the Abiotic Transformation of Organic Carbon during Redox Fluctuation Cycles of Paddy Soil

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Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of FeIII-Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam)

Abstract: A. (2020). Role of in situ natural organic matter in mobilizing as during microbial reduction of FeIII-mineral-bearing aquifer sediments from Hanoi (Vietnam). Environmental Science and Technology.

Cited by 64 publications

References 77 publications

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Influences of pH and substrate supply on the ratio of iron to sulfate reduction

Active Iron Phases Regulate the Abiotic Transformation of Organic Carbon during Redox Fluctuation Cycles of Paddy Soil

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Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of Fe^III-Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam)