A Simple Two-Parameter Correlation Model for Aqueous Electrolyte Solutions across a Wide Range of Temperatures
A Simple Two-Parameter Correlation Model for Aqueous Electrolyte Solutions across a Wide Range of Temperatures
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DOI：
10.1021/je800483q
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发表时间：
2009-02-01
期刊：
影响因子：
--
通讯作者：
Wang, Xidong
中科院分区：
文献类型：
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作者：
Ge, Xinlei;Wang, Xidong
本文采用一个简单的双参数模型，对水溶液在273.15 ~ 523.15 K温度范围内的热力学性质进行了关联。该模型是基于改进的三特征参数相关（TCPC）模型。两个参数，B，最接近的距离，和S，溶剂化参数，分别表示离子和离子-分子之间的相互作用。结果表明，该方法能较好地关联单一电解质溶液的活度系数和渗透系数。得到了许多电解质的两个特征参数的集合。我们还获得了这些电解质的温度依赖性参数。在超过70%的情况下，电解质需要六到八个参数。与Pitzer模型相比，该模型也具有较好的性能。
In this paper, we focused on the correlation of the thermodynamic properties of aqueous solutions across a temperature range from (273.15 to 523.15) K by a simple two-parameter model. This model is based on the modified three-characteristic-parameter correlation (TCPC) model. The two parameters, b, distance of closest approach, and S, solvation parameter, represent the interactions between ions and ions-molecules, respectively. The results show that it can adequately correlate the activity coefficient and osmotic coefficient of the single electrolyte solutions. The set of two characteristic parameters for many electrolytes was obtained. We also obtained the temperature-dependent parameters for these electrolytes. In over 70 % of the cases, six to eight parameters are necessary for an electrolyte. Compared with the Pitzer model, our model also represented a good performance.