Hydrolysis of dioxouranium(Vl):: a calorimetric study in NaClaq and NaClO4aq, at 25 °C

被引：11
作者：
Crea, F [1 ]
De Stefano, C [1 ]
Pettignano, A [1 ]
Sammartano, S [1 ]
机构：
[1] Univ Messina, Dipartimento Chim Inorgan Chim Analit & Chim Fis, I-98166 Messina, Vill S Agata, Italy
来源：
THERMOCHIMICA ACTA | 2004年 / 414卷 / 02期
关键词：
calorimetry; hydrolysis of UO(2)(2+); reaction enthalpy; ionic strength dependence;
D O I：
10.1016/j.tca.2003.12.018
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
We report the results of a calorimetric study on the hydrolysis of UO(2)(2+) in different ionic media (NaClO(4aq), NaCl(aq)) at 25 degreesC. Experiments in NaCl were performed at different ionic strength, at I less than or equal to 1 mol l(-1). The species considered in both ionic media were UO(2)(OH)(+), (UO(2))(2)(OH)(2)(2+) and (UO(2))(3)(OH)(5)(+), and in addition (UO(2))(3)(OH)(4)(2+) and (UO(2))(3)(OH)(7)(-) in NaCl(aq). The dependence on ionic strength of enthalpy changes in NaCl(aq) was expressed by the simple linear equation DeltaH(pq) = DeltaH(pq)degrees + al(1/2) (a, empirical parameter). Comparison with literature findings is given and some recommended values are reported. (C) 2004 Elsevier B.V. All rights reserved.
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收藏
页码：185 / 189
页数：5
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