Spectrophotometric investigation of U(VI) chloride complexation in the NaCl/NaClO{sub 4} system

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The option of a nuclear waste disposal in deep salt formations such as Gorleben in Germany, and the WIPP (Waste Isolation Pilot Plant) in southeastern New Mexico, US has generated, over the last ten years, interests in thermodynamic data of radioactive trace elements in concentrated electrolyte solutions. Furthermore, post closure radioactive release scenarios from geologic salt formation, such as the WIPP include hydrologic transport of radionuclides through a chloride saturated aquifer. Consequently, the understanding of actinide solution chemistry in brines is essential for modeling requiring accurate knowledge of the interaction between AnO{sub 2}{sup 2+} and chloride ions. The goal is ... continued below

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38 p.

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Paviet-Hartmann, P.; Lin, M.R. & Runde, W.H. February 1, 1999.

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Description

The option of a nuclear waste disposal in deep salt formations such as Gorleben in Germany, and the WIPP (Waste Isolation Pilot Plant) in southeastern New Mexico, US has generated, over the last ten years, interests in thermodynamic data of radioactive trace elements in concentrated electrolyte solutions. Furthermore, post closure radioactive release scenarios from geologic salt formation, such as the WIPP include hydrologic transport of radionuclides through a chloride saturated aquifer. Consequently, the understanding of actinide solution chemistry in brines is essential for modeling requiring accurate knowledge of the interaction between AnO{sub 2}{sup 2+} and chloride ions. The goal is to develop models capable of predicting their behavior in natural multicomponent brines of high concentration. Complexation constants of two U(VI) chloride species, UO{sub 2}Cl{sup +} and UO{sub 2}Cl{sub 2}{sup 0}, have been intensively studied for about 40 years using different methods. However, large uncertainties reflect the general difficulty in determining accurate stability constants of weak complexes. In order to model the behavior of U(VI) in brines, the authors studied the formation of its chloride complexes by UV-Vis spectroscopy as a function of the NaCl concentration at 25 C.

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38 p.

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INIS; OSTI as DE99002201

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  • Fall meeting of the Materials Research Society, Boston, MA (United States), 30 Nov - 4 Dec 1998

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  • Other: DE99002201
  • Report No.: LA-UR--99-708
  • Report No.: CONF-981104--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/334197 | External Link
  • Office of Scientific & Technical Information Report Number: 334197
  • Archival Resource Key: ark:/67531/metadc687827

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 1:52 p.m.

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Paviet-Hartmann, P.; Lin, M.R. & Runde, W.H. Spectrophotometric investigation of U(VI) chloride complexation in the NaCl/NaClO{sub 4} system, report, February 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc687827/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.