A critical review of thermodynamic data for inorganic tin species
A critical review of thermodynamic data for inorganic tin species
复制标题
DOI：
10.1016/s0016-7037(01)00645-7
复制
发表时间：
2001-09
影响因子：
5
通讯作者：
F. Séby;M. Potin-Gautier;E. Giffaut;O. Donard
中科院分区：
文献类型：
--
作者：
F. Séby;M. Potin-Gautier;E. Giffaut;O. Donard
为了给放射性废物深库中锡的迁移建模提供可靠的依据，对已发表的无机锡热力学数据的准确性进行了评估。研究了Sn（II）和Sn（IV）的水解、与卤素离子或其它无机物的络合以及沉淀反应。Guggenheim-Scatchard比相互作用理论用于将平衡常数校正为零离子强度。锡（II）在低浓度下可水解为SnOH+、Sn（OH）20和Sn（OH）3−。对于更高的锡水平，Sn 2（OH）22+和Sn（OH）42+多核物种是主要的。这些平衡在标准状态下的稳定常数进行了评价，从文献中提供的数据和建议值。锡（II）和卤素离子之间的络合反应是众所周知的，但形成的络合物物种仅存在于溶液中，当卤化物浓度> 10− 3 mol L− 1和pH值< 4时。在硫化物、硒化物或碲化物的存在下，亚锡离子形成非常稳定的固相。由于SnO 2（s）的溶解度非常低，文献中关于Sn（IV）水解、络合或沉淀反应的信息很少。
The accuracy of published inorganic tin thermodynamic data was evaluated to obtain a reliable basis for modeling Sn migration in a deep repository of radioactive waste. Hydrolysis, complexation with halide ions or other inorganic compounds, and precipitation reactions of Sn(II) and Sn(IV) were studied. The Guggenheim-Scatchard Specific Interaction Theory was used to correct equilibrium constant to zero ionic strength. Tin(II) can be hydrolysed into SnOH+, Sn(OH)20and Sn(OH)3−at low concentration. For higher tin levels, the Sn2(OH)22+and Sn(OH)42+polynuclear species are predominant. Stability constants of these equilibria at the standard state were evaluated from data available in the literature and recommended values are proposed. Complexation reactions between tin(II) and halide ions are well known, but the complex species formed are only present in solution when halide concentration is > 10−3mol L−1and at pH values < 4. In the presence of sulphides, selenides, or tellurides, the stannous ions form very stable solid phases. Because of the very low solubility of SnO2(s), little information is available in the literature about Sn(IV) hydrolysis, complexation, or precipitation reactions.