Thermodynamics and Complexation Reactions of Anionic Silicate Species Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Available Formats

Dublin Core: XML Dublin Core: JSON Dublin Core: Text Dublin Core: RDF/XML UNTL: XML Access METS: XML

Title

  • Main Title Thermodynamics and Complexation Reactions of Anionic Silicate Species

Creator

  • Author: Choppin, Gregory R.
    Creator Type: Personal
  • Author: Felmy, Andrew R.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of Environmental Management.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Environmental Management (EM) (United States)

Publisher

  • Name: Florida State University
    Place of Publication: United States
  • Name: Pacific Northwest National Laboratory (U.S.)
    Place of Publication: Richland, Washington
    Additional Info: Pacific Northwest National Lab., Richland, WA (United States)

Date

  • Creation: 2001-06-01

Language

  • English

Description

  • Content Description: Highly basic tank wastes contain several important radionuclides, including {sup 90}Sr, {sup 99}Tc, and {sup 60}Co as well as actinide elements (isotopes of U, Pu and Am). A fraction of these wastes are known to have leaked into the vadose zone at the Hanford Site. Upon entering the sediments in the vadose zone, such highly basic solutions dissolve concentrations of silica from the silica and aluminosilicate minerals present in subsurface. These dissolution reactions alter the chemical composition of the leaking solutions, transforming them from highly basic (as high as 2 M NaOH) solution into a pore solution with dissolved silica and significantly reduced pH. This moderately basic (pH 9 to 10), high-silica solution has the potential to complex radionuclides and promote migration through the subsurface. This path of radionuclide migration currently is not a recognized transport mode in the factors that are modeled for radionuclide transport through the vadose zone beneath leaking tanks. The goal of this project is to ascertain the free monosilicic acid concentration, and the degree of polymerization as a function of pH and total concentration of silicate ions, and to use this data to measure the interaction of radionuclides of Co(II), Sr(II), Nd(III), Eu(III), Am(III), U(VI) and Th(IV) with the ionic silicate.
  • Physical Description: 8 pages

Subject

  • Keyword: Chemical Composition
  • Keyword: Sediments
  • Keyword: Actinides
  • Keyword: Radionuclide Migration
  • STI Subject Categories: 37 Inorganic, Organic, Physical And Analytical Chemistry
  • Keyword: Dissolution
  • Keyword: Wastes
  • Keyword: Radioisotopes
  • Keyword: Thermodynamics
  • Keyword: Polymerization
  • Keyword: Transport
  • Keyword: Tanks
  • STI Subject Categories: 54 Environmental Sciences
  • Keyword: Silica
  • Keyword: Silicates

Source

  • Other Information: PBD: 1 Jun 2001

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: EMSP-70163--2001
  • Grant Number: FG07-99ER15023
  • DOI: 10.2172/833629
  • Office of Scientific & Technical Information Report Number: 833629
  • Archival Resource Key: ark:/67531/metadc787462
Back to Top of Screen