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A calorimetric study of the hydrolysis and peroxide complex formation of the uranyl(VI) ion
KTH, School of Chemical Science and Engineering (CHE), Chemistry.
2014 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 43, no 6, 2378-2383 p.Article in journal (Refereed) Published
Abstract [en]

The enthalpies of reaction for the formation of uranyl(VI) hydroxide {[(UO2)(2)(OH)(2)](2+), [(UO2)(3)(OH)(4)](2+), [(UO2)(3)(OH)(5)](+), [(UO2)(3)(OH)(6)]((aq)), [(UO2)(3)(OH)(7)](-), [(UO2)(3)(OH)(8)](2-), [(UO2)(OH)(3)](-), [(UO2)(OH)(4)](2-)} and peroxide complexes {[UO2(O-2)(OH)](-) and [(UO2)(2)(O-2)(2)(OH)](-)} have been determined from calorimetric titrations at 25 degrees C in a 0.100 M tetramethyl ammonium nitrate ionic medium. The hydroxide data have been used to test the consistency of the extensive thermodynamic database published by the Nuclear Energy Agency (I. Grenthe, J. Fuger, R. J. M. Konings, R. J. Lemire, A. B. Mueller, C. Nguyen-Trung and H. Wanner, Chemical Thermodynamics of Uranium, North-Holland, Amsterdam, 1992 and R. Guillaumont, T. Fanghanel, J. Fuger, I. Grenthe, V. Neck, D. J. Palmer and M. R. Rand, Update on the Chemical Thermodynamics of Uranium, Neptunium, Plutonium, Americium and Technetium, Elsevier, Amsterdam, 2003). A brief discussion is given about a possible structural relationship between the trinuclear complexes [(UO2)(3)(OH)(n)](6-n), n = 4-8.

Place, publisher, year, edition, pages
2014. Vol. 43, no 6, 2378-2383 p.
Keyword [en]
Uranium(VI), 25-Degrees-C, Temperatures, Acid
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-141306DOI: 10.1039/c3dt52922cISI: 000329928700009ScopusID: 2-s2.0-84892580233OAI: diva2:696529

QC 20140214

Available from: 2014-02-14 Created: 2014-02-13 Last updated: 2014-02-14Bibliographically approved

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