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Environmental Impact of Solution pH on the Formation and Migration of Iron Colloids in Deep Subsurface Energy Systems

Numerous  subsurface processes can promote fluid-rock interactions that can lead to the formation of small colloidal particles that are suspected to migrate through the...

December 1, 2023
Exposure of carbonate-rich rock to aqueous solution resulted in Fe mobilization and precipitation with trace metals such as Cr and Ni and the dislodgement of inert colloids such as silica.
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Characterization of Natural Ferrihydrite Nano-Colloids from a Redox-Active Floodplain

Colloids can transport nutrients, contaminants, and organic matter throughout watersheds. Their persistence, reactivity and heterogeneous compositions renders them key contributors to biogeochemical reactions. We...

June 30, 2023
illustration of a ferrhydrite
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Groundwater Quality: Microbial "Halos" Spread through Floodplain Aquifers

Floodplain groundwater is a critical resource for human activities and ecosystems. It is however increasingly threatened by climate change. While the impact of climate...

October 1, 2022
Floodplain Aquifer
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Export of Organic Carbon from Reduced fine-grained Zones Governs Biogeochemical Reactivity in Aquifer

The chemical composition of groundwater is determined by complex chemical and biological processes occurring in the aquifer. An important factor in this regard are...

January 24, 2022
Schematic illustration of the export of microorganisms and organic carbon substrates from a fine-grained into the coarse-grained zone of an aquifer.
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Soil Organic Matter Controls Pb Release During Redox Cycles In Floodplain Soils

Soil organic matter controls Pb release during redox cycles in floodplain soils   Lead released from mineral phases during hydrologic redox cycles is retained...
April 26, 2021
Low and high water diagram of Pb-POM
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Spatial and Compositional Heterogeneities Control Zn Retention Mechanisms in a Simulated Aquifer

  Export of carbon from organic-enriched lenses stimulates reducing conditions in oxic sandy aquifers, promoting redox cycling in high-flow zones. The Science Aquifers contain...
February 11, 2021
Fine-grained clay sediments rich in organic matter reduced iron and sulfur
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Hexavalent Uranium Storage Mechanisms In Wet-Dry Cycled Sediments At Contaminated DOE Sites In The Western U.S.

  Noël, V.; Boye, K.; Kukkadapu, R. K.; Li, Q.; Bargar, J. R. Uranium storage mechanisms in wet-dry redox cycled sediments. Water Research.  Water...
November 20, 2020
Process model of each drought cycle
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Microbial Communities In Floodplain Soils Remain Unchanged Throughout Seasonal Redox And Water Table Flux

  Fine-grained sediments appear to host distinct microbial groups that are stimulated through water table rise and fall throughout the season The Science Microbial...
August 14, 2020
Spring wet season to summer dry season graph
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Diverse Ammonia-Oxidizing Archaea Dominate Subsurface Nitrifying Communities In Semi-Arid Floodplains

  Ammonia oxidation may be driven by archaea rather than bacteria within the riparian subsurface The Science Subsurface microbial communities mediate key biogeochemical transformations...
June 13, 2020
AOA clusters across sites