Research Highlights

Research

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
Research

FeS Nanoclusters Can Mobilize Fe And S From Sediment To The Groundwater

    The Science Nanometer to micrometer sized mineral particles (often associated with organic carbon and often referred to as colloids) that remain suspended...
May 5, 2020
Graph showing the times of sulfidation
Research

Calcium-Uranyl-Carbonato Species Kinetically Limit U(VI) Reduction By Fe(II) And Result In U(V)-Bearing Ferrihydrite

Uranium (U) solubility determines the dissolved concentrations and thus its threat to water quality. It is therefore essential to understand the controls on U...

April 21, 2020
Dissolving calcium-carbonato-U(VI) species
Research

Redox Interfaces Can Produce Toxic Arsenic Levels In Groundwater From Low Arsenic-Abundance Sediments

  Sulfate-rich groundwater promote formation of thioarsenates at fine-coarse sediment interfaces and increases arsenic solubility The Science Groundwater contamination by As from natural and...
February 18, 2020
Sulfate chart of groundwater from oxic to anoxic
Research

Exported Organic Carbon Promotes Reducing Conditions And Redox Cycling In Oxic Aquifers Export Of Carbon From Organic-Enriched Lenses Stimulates...

Aquifers contain abundant organic-enriched, fine-grained, and sulfidic lenses. While it is widely understood that these heterogeneities are important sources of organic carbon, Fe(II), and...

February 18, 2020
Organic-enriched lenses export particulate/colloidal organic C into the surrounding aquifer
Research

Complexation By Organic Matter Controls Uranium Mobility In Anoxic Sediments

  Bone, S.E.; Cliff, J.; Weaver, K.; Takacs, C.J.; Roycroft, S.; Fendorf, S.; Bargar, J.R. Uranium complexation by organic matter and clay minerals in...
December 30, 2019
Reduced sediment high U(IV) content
Research

A Simplified Way To Predict The Function Of Microbial Communities

  This pioneering study offers an easier approach to study how microbes work and could help scientists advance models of the cycling of elements...
May 4, 2018
Particle floating from different areas
Research

Iron And Sulfur Cycling In NRZs Controlled By Sediment Textural And Hydrology

  https://doi.org/10.1016/j.scitotenv.2017.01.109 Detailed characterization of the molecular structures of Fe and S, on depth-resolved field samples from floodplain sediments, were performed using x-ray absorption...
December 15, 2017
Chart to the solute exchange from low to high
Research

A Regional Model For Uranium Redox And Mobility

  Subtitle: Redox variable sediments mediate uranium mobility in the upper Colorado River Basin. The Science               ...
December 15, 2017
Anoxic organic enriched sediments.