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Title: THERMODYNAMICS OF NEPTUNIUM(V) FLOURIDE AND SULFATE AT ELEVATED TEMPERATURES

Abstract

Complexation of neptunium(V) with fluoride and sulfate at elevated, temperatures was studied by microcalorimetry. Thermodynamic parameters, including the equilibrium constants and enthalpy of protonation of fluoride and sulfate, and the enthalpy of complexation between Np(V) and fluoride and sulfate at 25-70 C were determined. Results show that the complexation of Np(V) with fluoride and sulfate is endothermic and that the complexation is enhanced by the increase in temperature--a threefold increase in the stability constants of NpO{sub 2}F(aq) and NpO{sub 2}SO{sub 4}{sup -} as the temperature is increased from 25 to 70 C.

Authors:
; ; ;
Publication Date:
Research Org.:
Yucca Mountain Project, Las Vegas, NV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
886039
Report Number(s):
NA
MOL.20060427.0175, DC#47079; TRN: US0603929
DOE Contract Number:  
NA
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; NEPTUNIUM FLUORIDES; NEPTUNIUM SULFATES; ENTHALPY; STABILITY; THERMODYNAMIC PROPERTIES; NEPTUNIUM COMPLEXES; NEPTUNIUM OXIDES

Citation Formats

Rao, L, Tian, G, Xia, Y, and Friese, J I. THERMODYNAMICS OF NEPTUNIUM(V) FLOURIDE AND SULFATE AT ELEVATED TEMPERATURES. United States: N. p., 2006. Web. doi:10.2172/886039.
Rao, L, Tian, G, Xia, Y, & Friese, J I. THERMODYNAMICS OF NEPTUNIUM(V) FLOURIDE AND SULFATE AT ELEVATED TEMPERATURES. United States. https://doi.org/10.2172/886039
Rao, L, Tian, G, Xia, Y, and Friese, J I. 2006. "THERMODYNAMICS OF NEPTUNIUM(V) FLOURIDE AND SULFATE AT ELEVATED TEMPERATURES". United States. https://doi.org/10.2172/886039. https://www.osti.gov/servlets/purl/886039.
@article{osti_886039,
title = {THERMODYNAMICS OF NEPTUNIUM(V) FLOURIDE AND SULFATE AT ELEVATED TEMPERATURES},
author = {Rao, L and Tian, G and Xia, Y and Friese, J I},
abstractNote = {Complexation of neptunium(V) with fluoride and sulfate at elevated, temperatures was studied by microcalorimetry. Thermodynamic parameters, including the equilibrium constants and enthalpy of protonation of fluoride and sulfate, and the enthalpy of complexation between Np(V) and fluoride and sulfate at 25-70 C were determined. Results show that the complexation of Np(V) with fluoride and sulfate is endothermic and that the complexation is enhanced by the increase in temperature--a threefold increase in the stability constants of NpO{sub 2}F(aq) and NpO{sub 2}SO{sub 4}{sup -} as the temperature is increased from 25 to 70 C.},
doi = {10.2172/886039},
url = {https://www.osti.gov/biblio/886039}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2006},
month = {Mon Mar 06 00:00:00 EST 2006}
}