Sharon Bone

Redox controls on uranium mobility: the role of natural organic matter transformations

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

John Bargar

Project type

Special Science

Natural organic matter (NOM) profoundly influences the cycles of metals in the subsurface in its role as electron donor for bacteria and as a complexing agent. In the proposed work, we investigate…

Impact of natural organic matter on U speciation and mobility in groundwater

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

John Bargar

Project type

Exploratory Research

Uranium (U) contamination of aquifers is a persistent problem at DOE legacy ore processing sites and, contrary to initial predictions, many plumes are not attenuating with natural groundwater…

Biogeochemical controls exerted by organic-rich sediments on carbon cycling and uranium mobility

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

John Bargar

Project type

Large-Scale EMSL Research

Floodplains are hydrologically and biogeochemically dynamic environments that store extensive quantities of carbon, host diverse ecosystems, and serve as interfaces for nutrient and contaminant…

Role of Ca in Organic Matter Preservation

Lead Institution

Stanford Linear Accelerator Center

Principal Investigator

Sharon Bone

Project type

Large-Scale EMSL Research

Calcium can play a major role in the preservation of carbon in the subsurface due to its ability to participate in cation bridging. Ca2+ can link together two negatively charged moieties, such as two…

A Colloid is Born: Understanding iron-rich colloid genesis and transformation for improved watershed biogeochemical models

Lead Institution

Stanford Linear Accelerator Center

Principal Investigator

Kristin Boye

Project type

Large-Scale EMSL Research

Interfaces between subsurface layers of floodplains are ‘hot spots’ for thriving biogeochemical activity and exchange, owing to distinct compositional and permeability/porosity differences between…

Machine Learning Assisted Classification of Ca-Organic Matter Complexation Using X-ray Spectroscopies

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Niranjan Govind

Project type

Exploratory Research

Soils and sediments host large stores of organic carbon, which can be released to the atmosphere upon mineralization. Ca has the potential to play a key role in preventing mineralization of this…

EMSL Science Overview

Sharon Bone

Projects

Redox controls on uranium mobility: the role of natural organic matter transformations

Impact of natural organic matter on U speciation and mobility in groundwater

Biogeochemical controls exerted by organic-rich sediments on carbon cycling and uranium mobility

Role of Ca in Organic Matter Preservation

A Colloid is Born: Understanding iron-rich colloid genesis and transformation for improved watershed biogeochemical models

Machine Learning Assisted Classification of Ca-Organic Matter Complexation Using X-ray Spectroscopies