Spectrophotometric and Calorimetric Studies of Np(V) Complexation with Sulfate at 10-70oC Metadata

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Title

  • Main Title Spectrophotometric and Calorimetric Studies of Np(V) Complexation with Sulfate at 10-70oC

Creator

  • Author: Rao, Linfeng
    Creator Type: Personal
  • Author: Tian, Guoxin
    Creator Type: Personal
  • Author: Xia, Yuanxian
    Creator Type: Personal
  • Author: Friese, Judah I.
    Creator Type: Personal

Contributor

  • Sponsor: Lawrence Berkeley National Laboratory. Chemical Sciences Division.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Berkeley National Laboratory
    Place of Publication: Berkeley, California
    Additional Info: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States)

Date

  • Creation: 2008-06-16

Language

  • English

Description

  • Content Description: Sulfate, one of the inorganic constituents in the groundwater of nuclear waste repository, could affect the migration of radioactive materials by forming complexes. Spectrophotometric and microcalorimetric titrations were performed to identify the Np(V)/sulfate complex and determine the equilibrium constants and enthalpy of complexation at 10-70 C. Results show that the complexation of Np(V) with sulfate is weak but slightly enhanced by the increase in temperature. The complexation is endothermic and becomes more endothermic with the increase in temperature. The enhanced complexation at elevated temperatures is due to the increasingly larger entropy of complexation that exceeds the increase in enthalpy, suggesting that the complexation of Np(V) with sulfate is entropy-driven.

Subject

  • STI Subject Categories: 11
  • Keyword: Radioactive Wastes
  • Keyword: Sulfates
  • Keyword: Radioactive Materials
  • Keyword: Enthalpy
  • Keyword: Entropy

Source

  • Journal Name: Journal of Thermal Analysis and Calorimetry

Collection

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

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: LBNL-421E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 961592
  • Archival Resource Key: ark:/67531/metadc928484
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