Redox Buffer Capacity in Water-Rock-Microbe Interaction Systems in Subsurface Environments

Amano, Yuki; Sasao, Eiji; Niizato, Tadafumi; Iwatsuki, Teruki

doi:10.1080/01490451.2011.604112

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…The dominant class in the saturated zone was Betaproteobacteria, which exhibited similar abundance in all three columns (11.0–12.6%). This finding further revealed that Betaproteobacteria appear to be widely adapted to natural subsurface environments (Amano, Sasao, Niizato, & Iwatsuki, 2012) and are highly resistant to rapid short‐term, cyclic, groundwater‐level oscillations. The other dominant classes included Gemmatimonadetes, Sub_group6, Deltaproteobacteria, Sphingobacteriia, Bacilli, and Clostridia across the vadose, oscillated, and saturated zones of three columns.…”

Section: Resultsmentioning

confidence: 82%

Response of soil bacterial community and geochemical parameters to cyclic groundwater‐level oscillations in laboratory columns

Xia

Cheng

Zhu

et al. 2020

Vadose Zone Journal

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Groundwater-level oscillations change geochemical conditions, C cycling processes, and bacterial community composition, and these changes may vary vertically with depth in a soil. In this study, soil column experiments were conducted to explore variations in soil bacterial community composition and its associated geochemical parameters to rapid short-term cyclic groundwater-level oscillations driven by natural fluctuations (NF) and rainfall infiltration (RI), and the results are compared with a quasistatic (QS) column. Water saturation patterns in vadose and oscillated zones, and O 2 level patterns, soil total organic C (TOC) removal rates, and soil bacterial community composition in vadose, oscillated, and saturated zones were evaluated. Results showed that water saturation and O 2 level oscillated with groundwater level in NF and RI columns. Total organic C removal rates in RI column were the highest across vadose (∼38.4%), oscillated (∼35.8%), and saturated (∼35.2%) zones. Deltaproteobacteria, which were significantly correlated with TOC removal (p < .05), were found in higher abundance in the vadose and oscillated zones of the RI column than in the QS and NF columns. Soil bacterial community structure was dynamic at the class level due to water saturation, O 2 level, and TOC removal. Total organic C removal was the driver to separate the distribution of bacterial community structure in the vadose and oscillated zones of the RI column from those of the QS and NF columns. This study suggests that RI induced rapid, short-term, cyclic, groundwater-level oscillations could significantly influence both the soil C cycle and bacterial community structure in the vadose and oscillated zones.

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Section: Resultsmentioning

confidence: 82%

Response of soil bacterial community and geochemical parameters to cyclic groundwater‐level oscillations in laboratory columns

Xia

Cheng

Zhu

et al. 2020

Vadose Zone Journal

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“…The redox buffering capacity in reduced environments is not limited to abiotic reactions. Microbial activity has also been demonstrated to play a significant role in redox buffering in sedimentary environments by scavenging oxidants . The effect of an influx of oxidants on reoxidation and remobilization of U in situ is not yet well understood.…”

Section: Introductionmentioning

confidence: 99%

“…Microbial activity has also been demonstrated to play a significant role in redox buffering in sedimentary environments by scavenging oxidants. 22 The effect of an influx of oxidants on reoxidation and remobilization of U in situ is not yet well understood. However, the prevailing hypothesis describes that an influx of oxidants (such as DO and nitrate) will oxidize reduced metals and radionuclides subsequently increasing U mobility.…”

Section: ■ Introductionmentioning

confidence: 99%

Uranium Retention in a Bioreduced Region of an Alluvial Aquifer Induced by the Influx of Dissolved Oxygen

Pan

Williams

Robbins

et al. 2018

Environ. Sci. Technol.

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Reduced zones in the subsurface represent biogeochemically active hotspots enriched in buried organic matter and reduced metals. Within a shallow alluvial aquifer located near Rifle, CO, reduced zones control the fate and transport of uranium (U). Though an influx of dissolved oxygen (DO) would be expected to mobilize U, we report U immobilization. Groundwater U concentrations decreased following delivery of DO (21.6 mg O/well/h). After 23 days of DO delivery, injection of oxygenated groundwater was paused and resulted in the rebound of groundwater U concentrations to preinjection levels. When DO delivery resumed (day 51), groundwater U concentrations again decreased. The injection was halted on day 82 again and resulted in a rebound of groundwater U concentrations. DO delivery rate was increased to 54 mg O/well/h (day 95) whereby groundwater U concentrations increased. Planktonic cell abundance remained stable throughout the experiment, but virus-to-microbial cell ratio increased 1.8-3.4-fold with initial DO delivery, indicative of microbial activity in response to DO injection. Together, these results indicate that the redox-buffering capacity of reduced sediments can prevent U mobilization, but could be overcome as delivery rate or oxidant concentration increases, mobilizing U.

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Potential for microbial H2 and metal transformations associated with novel bacteria and archaea in deep terrestrial subsurface sediments

et al. 2017

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Geological sequestration in deep underground repositories is the prevailing proposed route for radioactive waste disposal. After the disposal of radioactive waste in the subsurface, H2 may be produced by corrosion of steel and, ultimately, radionuclides will be exposed to the surrounding environment. To evaluate the potential for microbial activities to impact disposal systems, we explored the microbial community structure and metabolic functions of a sediment-hosted ecosystem at the Horonobe Underground Research Laboratory, Hokkaido, Japan. Overall, we found that the ecosystem hosted organisms from diverse lineages, including many from the phyla that lack isolated representatives. The majority of organisms can metabolize H2, often via oxidative [NiFe] hydrogenases or electron-bifurcating [FeFe] hydrogenases that enable ferredoxin-based pathways, including the ion motive Rnf complex. Many organisms implicated in H2 metabolism are also predicted to catalyze carbon, nitrogen, iron and sulfur transformations. Notably, iron-based metabolism is predicted in a novel lineage of Actinobacteria and in a putative methane-oxidizing ANME-2d archaeon. We infer an ecological model that links microorganisms to sediment-derived resources and predict potential impacts of microbial activity on H2 consumption and retardation of radionuclide migration.

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Redox Buffer Capacity in Water-Rock-Microbe Interaction Systems in Subsurface Environments

Cited by 4 publications

References 40 publications

Response of soil bacterial community and geochemical parameters to cyclic groundwater‐level oscillations in laboratory columns

Response of soil bacterial community and geochemical parameters to cyclic groundwater‐level oscillations in laboratory columns

Uranium Retention in a Bioreduced Region of an Alluvial Aquifer Induced by the Influx of Dissolved Oxygen

Potential for microbial H2 and metal transformations associated with novel bacteria and archaea in deep terrestrial subsurface sediments

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