Spectrophotometric Investigation of U(VI) Chloride Complexation in the NaCl/NaClO{sub 4} System

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Post closure radioactive release scenarios from geologic salt formation, such as the WIPP (Waste Isolation Pilot Plant)(USA) 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. 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 ... continued below

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8 p.

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Paviet-Hartmann, P.; Lin, M.R. & Runde, W.H. November 30, 1998.

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Post closure radioactive release scenarios from geologic salt formation, such as the WIPP (Waste Isolation Pilot Plant)(USA) 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. 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, we studied the formation of its chloride complexes by UV-Vis spectroscopy as a function of the NaCl concentration at 25 C. The experiments were performed at constant ionic strength by varying the concentration ratio of NaCl and NaClO{sub 4}. Deconvolution resulted in single component absorption spectra for UO{sub 2}Cl{sup +} and UO{sub 2}Cl{sub 2}{sup 0}. The apparent stability constants of UO{sub 2}Cl{sup +} and UO{sub 2}Cl{sub 2}{sup 0} are at different ionic strengths and the experimental data are used to parameterize using the SIT approach.

Physical Description

8 p.

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INIS; OSTI as DE00762285

Medium: P; Size: 8 pages

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  • Materials Research Society, Boston, MA (US), 11/30/1998--12/04/1998

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  • Report No.: LA-UR-98-4787
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 762285
  • Archival Resource Key: ark:/67531/metadc724450

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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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  • November 30, 1998

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 11, 2017, 7:06 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, article, November 30, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc724450/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.