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

Technical Report · Mon Feb 01 04:00:00 EST 1999

DOI:https://doi.org/10.2172/334197· OSTI ID:334197

Paviet-Hartmann, P; Lin, M R; Runde, W H

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.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 334197
• Report Number(s): LA-UR--99-708; CONF-981104--; ON: DE99002201
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
40 CHEMISTRY
COMPLEXOMETRY
CONCENTRATION RATIO
ELECTROLYTES
EXPERIMENTAL DATA
RADIOACTIVE WASTE DISPOSAL
SODIUM CHLORIDES
SODIUM PERCHLORATES
SPECTROPHOTOMETRY
URANIUM CHLORIDES