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Actinide (III) solubility in WIPP Brine: data summary and recommendations

Description: The solubility of actinides in the +3 oxidation state is an important input into the Waste Isolation Pilot Plant (WIPP) performance assessment (PA) models that calculate potential actinide release from the WIPP repository. In this context, the solubility of neodymium(III) was determined as a function of pH, carbonate concentration, and WIPP brine composition. Additionally, we conducted a literature review on the solubility of +3 actinides under WIPP-related conditions. Neodymium(III) was used a… more
Date: September 1, 2009
Creator: Borkowski, Marian; Lucchini, Jean-Francois; Richmann, Michael K. & Reed, Donald T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CSSX Radiolytic H2 Generation ("Thermolysis") -- Final Report

Description: The purpose of this work was to determine the radiolytic hydrogen gas yield of irradiated CSSX solvent at several temperatures. The active ingredient of this solvent is calix[4]arene-bis-(t-octylbenzo) crown-6, a calixarene crown ether used for cesium complexation. The solvent also contains 1-(2,2,3,3-tetrafluoropropoxy)-3-(4-sec-butylphenoxy)-2-propanol, a fluorinated alcoholic solvent modifer used to improve the solubility of the calixarene and its cesium complex in the Isopar L diluent. Isop… more
Date: January 1, 2009
Creator: Mincher, Bruce J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fate of Contaminants in Contact with West Valley Grouts

Description: The objective of the work described here is to determine to what extent a variety of contaminants, including fission products, actinides, and RCRA elements are sequestered by the two grout formulations. The conceptual model for this study is as follows: a large mass of grout having been poured into a high-level waste tank is in the process of aging and weathering for thousands of years. The waste remaining in the tank will contain radionuclides and other contaminants, much of which will adhere … more
Date: July 1, 2009
Creator: Fuhrmann,M. & Gillow, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Implementation of equilibrium aqueous speciation and solubility (EQ3 type) calculations into Cantera for electrolyte solutions.

Description: In this report, we summarize our work on developing a production level capability for modeling brine thermodynamic properties using the open-source code Cantera. This implementation into Cantera allows for the application of chemical thermodynamics to describe the interactions between a solid and an electrolyte solution at chemical equilibrium. The formulations to evaluate the thermodynamic properties of electrolytes are based on Pitzer's model to calculate molality-based activity coefficients … more
Date: June 1, 2009
Creator: Moffat, Harry K. & Jove-Colon, Carlos F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Interdiffusion in Diffusion Couples: U-Mo v. Al and Al-Si

Description: Interdiffusion and microstructural development in the U-Mo-Al system was examined using solid-tosolid diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. pure Al, annealed at 600°C for 24 hours. The influence of Si alloying addition (up to 5 wt.%) in Al on the interdiffusion microstructural development was also examined using solid-to-solid diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. pure Al, Al-2wt.%Si, and Al-5wt.%Si annealed at 550°C up to 20… more
Date: November 1, 2009
Creator: Keiser, D. D. Jr.; Perez, E.; Yao, B. & Sohn, Y. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stability of uranium incorporated into Fe(hydr)oxides under fluctuating redox conditions

Description: Reaction pathways resulting in uranium bearing solids that are stable (i.e., having limited solubility) under both aerobic and anaerobic conditions will limit dissolved concentrations and migration of this toxin. Here we examine the sorption mechanism and propensity for release of uranium reacted with Fe (hydr)oxides under cyclic oxidizing and reducing conditions. Upon reaction of ferrihydrite with Fe(II) under conditions where aqueous Ca-UO{sub 2}-CO{sub 3} species predominate (3 mM Ca and 3.8… more
Date: April 1, 2009
Creator: Stewart, B.D.; Nico, P.S. & Fendorf, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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