James Szecsody

Experimental Investigation of Sr-90 Subsurface Contamination Sequestration in Hanford 100N Area Sediments by Surface Infiltration of an Apatite Solution

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Szecsody

Project type

Large-Scale EMSL Research

Strontium-90 (Sr-90) discharge from past-practice liquid waste disposal sites in the Hanford 100N area have resulted in Sr-90 release to groundwater, Columbia River, and biota on the Columbia River…

Characterization of Iron Sulfide Mineral Phases Associated with the Reductive Sequestration of Technetium

Lead Institution

Oregon Health & Science University

Principal Investigator

Paul Tratnyek

Project type

Large-Scale EMSL Research

Under reducing conditions, TcO4- is readily reduced to TcIV, which forms highly insoluble oxides such as TcO2-nH2O, but (re)oxidation of TcIV oxides can lead to remobilization. Under sulfidogenic…

Radioactive Contaminants Characterization

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Synthesis of radioactive components of nuclear weapons generated abundant contaminant components, which were purposefully or accidentally disseminated into the terrestrial environment. This project…

Intermediate Flow Cells (PNNL SCOPE #28662)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Tom Resch

Project type

Exploratory Research

I need the ion chromatograph for analysis of solutions of an intermediate-scale flow cell bio-stimulation experiment. The experiment used porous sand media with lenticular shaped inclusions of…

Influence of Flow on Abiotic and Biotic Reactivity of CL--20 (hexaanitrohexaazaiso-wurtzitane) (PNNL Scope # 42095)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Szecsody

Project type

Exploratory Research

Mechanistic studies of surface bound natural FeII , or surface bound biogenically or chemically reduced Fe on the degradation kinetics of CL-20 (hexaanitrohexaazaiso-wurtzitane) are being conducted…

Lab Studies of Phytoremediation & Apatite Sequestration (PNNL Scope #46524

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Szecsody

Project type

Exploratory Research

Need IC analysis on some samples

Intermediate-scale experiments to investigate subsurface flow and transport of an apataite solution in support of Sr-90 sequestration at the Hanford 100N Area

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Szecsody

Project type

Exploratory Research

The attached proposal has recently been funded after an extensive peer review. The unique capabilities of the Subsurface Flow and Transport Experimental Laboratory in the EMSL are needed to complete…

Use of NMR Microscopy to examine the dynamic sub-pore-scale structure of biofilms under growth conditions

Lead Institution

Oregon State University

Principal Investigator

Brian Wood

Project type

Capability Research

We propose to continue our investigation of the use of NMR microscopy for resolving the sub-pore-scale structure of multiphase porous media. These results will provide crucial proof-of-principal…

Formation of Apatite in Hanford Vadose Zone Sediments by Gaseous Injection of Phosphorus Compounds

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Mark Rockhold

Project type

Exploratory Research

Large regions of strontium-90 and technetium-99 contamination exist in the unsaturated zone at Hanford at depths that are impractical for excavation. No active remediation options have been developed…

EMSL Science Overview

James Szecsody

Projects

Experimental Investigation of Sr-90 Subsurface Contamination Sequestration in Hanford 100N Area Sediments by Surface Infiltration of an Apatite Solution

Characterization of Iron Sulfide Mineral Phases Associated with the Reductive Sequestration of Technetium

Radioactive Contaminants Characterization

Intermediate Flow Cells (PNNL SCOPE #28662)

Influence of Flow on Abiotic and Biotic Reactivity of CL--20 (hexaanitrohexaazaiso-wurtzitane) (PNNL Scope # 42095)

Lab Studies of Phytoremediation & Apatite Sequestration (PNNL Scope #46524

Intermediate-scale experiments to investigate subsurface flow and transport of an apataite solution in support of Sr-90 sequestration at the Hanford 100N Area

Use of NMR Microscopy to examine the dynamic sub-pore-scale structure of biofilms under growth conditions

Formation of Apatite in Hanford Vadose Zone Sediments by Gaseous Injection of Phosphorus Compounds