Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 95: Issue 2
Complexation of neptunium(V) with fluoride in aqueous solutions at elevated temperatures
Authors:
G. Tian Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

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L. Rao Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

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Y. Xia Pacific Northwest National Laboratory Richland WA 99352 USA

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J. Friese Pacific Northwest National Laboratory Richland WA 99352 USA

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Pages:
415–419
Online Publication Date:
12 Mar 2009
Publication Date:
01 Feb 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9248-z
Keywords:
complexation; fluoride; neptunium; temperature effect
Restricted access

Abstract  

Complexation of neptunium(V) with fluoride in aqueous solutions at elevated temperatures was studied by spectrophotometry and microcalorimetry. Two successive complexes, NpO2F(aq) and NpO2F2−, were identified by spectrophotometry in the temperature range of 10–70°C. Thermodynamic parameters, including the equilibrium constants and enthalpy of complexation between Np(V) and fluoride at 10–70°C were determined. Results show that the complexation of Np(V) with fluoride is endothermic and that the complexation is enhanced by the increase in temperature — a two-fold increase in the stability constants of NpO2F(aq) and more than five-fold increase in the stability constants of NpO2F2− as the temperature is increased from 10 to 70°C.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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