• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Hydrolysis of plutonium(VI) at variable temperatures (283-343 K)
【24h】

Hydrolysis of plutonium(VI) at variable temperatures (283-343 K)

机译：可变温度（283-343 K）下of的水解

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The hydrolysis of Pu ~(VI) was studied at variable temperatures (283-343 K) by potentiometry, microcalorimetry, and spectrophotometry. Three hydrolysis reactions, mPuO_2~(2+)+nH_2O=(PuO _2)_m(OH)_n (2m-n) ++nH~+), in which (n,m)=(1,1), (2,2), and (5,3), were invoked to describe the potentiometric and calorimetric data. The equilibrium constants (*β_(n,m)) were determined by potentiometry at 283, 298, 313, 328, and 343 K. As the temperature was increased from 283 to 343 K,*β_(1,1), *β_(2,2), and*β_(5,3), increased by 1, 1.5, and 4 orders of magnitude, respectively. The enhancement of hydrolysis at elevated temperatures is mainly due to the significant increase of the degree of ionization of water as the temperature increases. Measurements by microcalorimetry indicate that the three hydrolysis reactions are all endothermic at 298.15 K, with enthalpies of (35.0±3.4) kJ mol ~(-1), (65.4±1.0) kJ mol~(-1), and (127.7±1.7) kJ mol~(-1) for ΔH_(1,1), ΔH_(2,2), and ΔH_(5,3), respectively. The hydrolysis constants at infinite dilution have been obtained with the Specific Ion Interaction approach. The applicability of three approaches for estimating the equilibrium constants at different temperatures, including the constant enthalpy approach, the DQUANT equation, and the Ryzhenko-Bryzgalin model, were evaluated with the data from this work.
机译：通过电位法，微量量热法和分光光度法研究了在可变温度（283-343 K）下对Pu〜（VI）的水解作用。三种水解反应，mPuO_2〜（2 +）+ nH_2O =（PuO _2）_m（OH）_n（2m-n）++ nH〜+），其中（n，m] = [1,1），（2 ，（2）和（5，3）被用来描述电位和量热数据。平衡常数（*β_（n，m））通过电位计在283、298、313、328和343 K下确定。随着温度从283 K升高到343 K，*β_（1,1），*β_ （2,2）和*β_（5,3）分别增加了1、1.5和4个数量级。高温下水解的增强主要是由于水的离子化程度随温度升高而显着增加。微量热法测量表明，三个水解反应均在298.15 K下发生吸热，焓为（35.0±3.4）kJ mol〜（-1），（65.4±1.0）kJ mol〜（-1）和（127.7±1.7） ）kJ mol〜（-1）分别表示ΔH_（1,1），ΔH_（2,2）和ΔH_（5,3）。通过特定离子相互作用方法获得了无限稀释时的水解常数。这项工作的数据评估了三种方法在不同温度下估算平衡常数的适用性，包括恒定焓法，DQUANT方程和Ryzhenko-Bryzgalin模型。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号