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Assessment of the thermodynamic behavior of neptunium in water and model groundwaters from 25 to 150/sup 0/C

Abstract

Standard molal Gibbs energy of formation and entropy data for simple neptunium solids and aqueous neptunium complexes with OH/sup -/, Cl/sup -/, F/sup -/, CO/sub 3//sup 2 -/, PO/sub 4//sup 3 -/, SO/sub 4//sup 2 -/ and Na/sup +/ have been critically reviewed. Selected values are used with estimated heat capacity values to derive self-consistent analytical expressions for the temperature dependence of the standard molal Gibbs energies of formation of the species from 25 to 150/sup 0/C. The Gibbs energies have been used to evaluate the effect of different concentrations of ligands on the solubility of neptunium solids as a function of temperature. Potential-pH diagrams are given for neptunium in pure water and in two model groundwaters. Important deficiencies in the available thermodynamic data for neptunium species are discussed. 90 references, 12 figures, 6 tables.
Authors:
Publication Date:
Mar 15, 1984
Product Type:
Technical Report
Report Number:
AECL-7817
Reference Number:
EDB-84-119127
Resource Relation:
Other Information: Portions are illegible in microfiche products. Work performed under the Canada/US Waste Management Information Exchange Agreement
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; NEPTUNIUM COMPLEXES; FORMATION FREE ENTHALPY; SPECIFIC HEAT; NEPTUNIUM COMPOUNDS; SOLUBILITY; AQUEOUS SOLUTIONS; CARBONATES; CATIONS; CHLORIDES; DATA COMPILATION; FLUORIDES; GROUND WATER; HIGH TEMPERATURE; HYDROXIDES; LIGANDS; MEDIUM TEMPERATURE; PH VALUE; PHOSPHATES; SODIUM COMPOUNDS; SULFATES; TEMPERATURE DEPENDENCE; WATER; ACTINIDE COMPLEXES; ACTINIDE COMPOUNDS; ALKALI METAL COMPOUNDS; CARBON COMPOUNDS; CHARGED PARTICLES; CHLORINE COMPOUNDS; COMPLEXES; DATA; DISPERSIONS; ENERGY; FLUORINE COMPOUNDS; FREE ENTHALPY; HALIDES; HALOGEN COMPOUNDS; HYDROGEN COMPOUNDS; INFORMATION; IONS; MIXTURES; NUMERICAL DATA; OXYGEN COMPOUNDS; PHOSPHORUS COMPOUNDS; PHYSICAL PROPERTIES; SOLUTIONS; SULFUR COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSURANIUM COMPLEXES; TRANSURANIUM COMPOUNDS; 400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials
OSTI ID:
7023336
Research Organizations:
Atomic Energy of Canada Ltd., Pinawa, Manitoba, Canada. Whiteshell Nuclear Research Establishment
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: TI84901537
Availability:
Also available from the Scientific Document Dist. Office, AECL, Chalk River, Ontario, Canada;
Submitting Site:
TIC
Size:
Pages: 62
Announcement Date:

Citation Formats

Lemire, R J. Assessment of the thermodynamic behavior of neptunium in water and model groundwaters from 25 to 150/sup 0/C. Canada: N. p., 1984. Web.
Lemire, R J. Assessment of the thermodynamic behavior of neptunium in water and model groundwaters from 25 to 150/sup 0/C. Canada.
Lemire, R J. 1984. "Assessment of the thermodynamic behavior of neptunium in water and model groundwaters from 25 to 150/sup 0/C." Canada.
@misc{etde_7023336,
title = {Assessment of the thermodynamic behavior of neptunium in water and model groundwaters from 25 to 150/sup 0/C}
author = {Lemire, R J}
abstractNote = {Standard molal Gibbs energy of formation and entropy data for simple neptunium solids and aqueous neptunium complexes with OH/sup -/, Cl/sup -/, F/sup -/, CO/sub 3//sup 2 -/, PO/sub 4//sup 3 -/, SO/sub 4//sup 2 -/ and Na/sup +/ have been critically reviewed. Selected values are used with estimated heat capacity values to derive self-consistent analytical expressions for the temperature dependence of the standard molal Gibbs energies of formation of the species from 25 to 150/sup 0/C. The Gibbs energies have been used to evaluate the effect of different concentrations of ligands on the solubility of neptunium solids as a function of temperature. Potential-pH diagrams are given for neptunium in pure water and in two model groundwaters. Important deficiencies in the available thermodynamic data for neptunium species are discussed. 90 references, 12 figures, 6 tables.}
place = {Canada}
year = {1984}
month = {Mar}
}