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Thomas Wietsma

Institution
Environmental Molecular Sciences Laboratory
ORCID
ORCID logo 0000-0002-7580-4711

Projects

X-Ray Computed Tomography of Sediment Samples

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Danielle Saunders
Project type
Contracted Time
We propose to use X-ray computed tomography (XCT) to generate 3-D images of sediment cores to aid in describing the physical characteristics of the subsurface. Intact core sediments (e.g., from the…

X-Ray Computed Tomography of Sediment Samples

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Michelle Valenta Snyder
We propose to use X-ray computed tomography (XCT) to generate 3-D images of sediment cores to aid in describing the physical characteristics of the subsurface. Intact core sediments (e.g., from the…

Demonstration of the Capability of Mobility-Controlled-Flooding Technology to Overcome Heterogeneity Induced Bypassing in Subsurface Remediation (PNNL LDRD #90001
Overcoming Heterogeneity Induced Bypassing)

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Lirong Zhong
Project type
Exploratory Research
Introduction Heterogeneity induces bypassing of low-permeability zones in subsurface fluid flooding operations for remediation purposes. The contaminant in the bypassed areas is therefore…

X Ray Tomography of Intact Hanford Cores

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Adam Mangel
We propose to use XCT to generate 3-D images of sediment cores to aid in describing the physical characteristics of the subsurface. Intact core from the Hanford Central Plateau require sediment…

Development of a Microfluidics Flow and Transport Laboratory

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Mart Oostrom
Project type
Large-Scale EMSL Research
The Environmental Spectroscopy and Biogeochemistry (ESB) Facility, in collaboration with the University of Illinois at Champaign/Urbana, proposes to develop a microfluidics capability to investigate…

Remediation & Closure Science Project/ Subsurface Science Tasks (Zachara/Freshly, EM-closure, PNNL Scope #47040). [was aka S & T Road Mapping for Needs From All Sources (PNNL Scope #30998)].

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
John Zachara
Project type
Exploratory Research
Hanford Remediation and Closure Science Project The Hanford Site Groundwater Protection Program, formerly the Groundwater/ Vadose Zone Integration Project, was established in 1997 to develop the…

Effect of NAPL Dissolution on NAPL-Water Interfacial Area

Lead Institution
Swiss Federal Institute of Technology
Principal Investigator
Martin Schroth
Project type
Exploratory Research
The release of nonaqueous-phase liquids (NAPL) into soils and aquifers is a widespread and serious environmental problem. The typically low solubilities of NAPL cause them to dissolve slowly; thus…

Chlorinated Methane Hydrolysis Rates

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
James Amonette
Project type
Large-Scale EMSL Research
The purpose of the work proposed here is to develop accurate physical chemical data for the hydrolysis rates of carbon tetrachloride (CT) and chloroform (CF) under conditions (temperature, pH,…

High-throughput rhizosphere biosensor development

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Joshua Elmore
The development of robust quantitative in situ bacterial biosensors that report on inter-organismal rhizosphere signaling, soil conditions, and plant health remains a pivotal goal for the research…

Chemistry of Aerosols in Mexico City: MILAGRO 2006 study.

Lead Institution
Lawrence Berkeley National Laboratory
Principal Investigator
Mary Gilles
Project type
Large-Scale EMSL Research
The MILAGRO (Megacity Initiative: Local and Global Research Observations) Campaign in Mexico City 2006 was a collaborative effort with the DOE Atmospheric Science Program, the NSF MIRAGE-Mex field…

X-Ray Computed Tomography of Sediment Samples

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Michelle Valenta Snyder
We propose to use X-ray computed tomography (XCT) to generate 3-D images of sediment cores to aid in describing the physical characteristics of the subsurface. Intact core sediments (e.g., from the…

Protein Interactions and Interfaces

Lead Institution
Rutgers University
Principal Investigator
Gaetano Montelione
Project type
Large-Scale EMSL Research
All proteins interact with other molecules: ligands, metals, membranes, surfaces or other proteins. Such interactions are intrinsic to protein function. We propose to leverage our successful program…

1000 Soils Research Campaign

Lead Institution
Environmental Molecular Sciences Laboratory
Principal Investigator
Nancy Hess
Project type
MONet
To more fully understand the cycling of carbon, carbon-based nutrients and key elements from the molecular to basin scale across variations in soil chemistry, the Environmental Molecular Sciences…

Experimental and Theoretical Studies of Reaction Pathways for the Breakdown of Chlorinated Hydrocarbon Molecules by Metal and Metal Oxide Nanoparticles(including PNNL Scope # 42184/44076, Baer/Amonette/Tratnyek Nano-Fe BES/EMSP project)

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
James Amonette
Project type
Large-Scale EMSL Research
Metal and metal-oxide nanoparticles have been shown to have high reactivity towards a variety of chemical species, including chlorinated hydrocarbons and reducible oxyanions that frequently…

Chrome Volatility

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Gary Maupin
Project type
Exploratory Research
Determine the volalitility of Cr in Fuel Cell Systems

Micromodel Pore-Scale Displacement Studies of Brine and Supercritical CO2

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Mart Oostrom
Project type
Exploratory Research
Supercritical carbon dioxide (scCO2) sequestration in deep saline aquifers or reservoirs is, to a large extent, affected by porous medium properties, fluid properties, and interfacial interactions…

An Integrated Approach to Quantifying the Coupled Biotic and Abiotic Mechanism, Rates and Long-Term Performance of Phosphate Barriers for In Situ Immobilization of Uranium

Lead Institution
Pacific Northwest National Laboratory
Principal Investigator
Dawn Wellman
Project type
Large-Scale EMSL Research
Operations related to nuclear energy and weapons production have resulted in numerous areas, worldwide, exhibiting surface and subsurface uranium contamination of geologic media. Within the United…

Rhizosphere processes at molecular to core scale

Lead Institution
Environmental Molecular Sciences Laboratory
Principal Investigator
Nancy Hess
The amount of C in soil far exceeds the C content of atmosphere as well as the amount C stored above ground as plant biomass. The C fluxes between atmosphere and biomass are huge, many orders of…

Desiccation of Porous Media to Limit Contaminant Migration

Lead Institution
Auburn University
Principal Investigator
Jacob Dane
Project type
Large-Scale EMSL Research
The primary attribute of soil desiccation is the removal of excess moisture from the subsurface, thereby reducing potential downward migration of water and contaminant solutes within the vadose zone…