Investigations on the Uncertainties of Solubilities of Salts in Solid-Liquid Phase Equilibria of Water–Salt Systems: Taking the Ternary System LiCl–MgCl2–H2O as an Example

IF 2 3区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY
Xiang Zhang, Shi-Hua Sang*, Hu Chen, Lan-Rong Zhao, Xiao Zhang and Xiao-Feng Guo, 
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Abstract

More and more studies of phase equilibria focus on the accuracy of the solubility data. Consequently, in this work, the uncertainties of Cl and Mg2+ content in equilibrium solution were calculated in steps by using the Guide to the Expression of Uncertainty in Measurement (GUM) method on the basis of experimental studies. The uncertainty components that may be introduced during the experiment were investigated and calculated, and then, the synthetic standard uncertainty was obtained. The major factors that introduce uncertainty during the experiment are the sampling volume, temperature variations, capacity tolerances of the glassware, etc. According to the uncertainty model established in this work, the uncertainties of the solubilities of salts LiCl and MgCl2 in the ternary system LiCl–MgCl2–H2O were calculated, respectively. The results indicated that the maximum uncertainty of the solubility of LiCl does not exceed ±0.41 and the minimum uncertainty is not less than ±0.17 in mass percent. Moreover, the maximum uncertainty of the solubility of MgCl2 does not exceed ±0.29 in mass percent. As a result, the solubility diagrams with uncertainties of the ternary system LiCl–MgCl2–H2O were plotted in detail. This GUM method can also be widely used to evaluate thermodynamically relevant measurements in solution.

Abstract Image

水-盐体系固-液平衡中盐溶解度的不确定性研究——以三元体系LiCl-MgCl2-H2O为例
相平衡的研究越来越关注溶解度数据的准确性。因此,本文在实验研究的基础上,采用测量不确定度表达指南(GUM)方法,分步骤计算了平衡溶液中Cl -和Mg2+含量的不确定度。对实验中可能引入的不确定度分量进行了研究和计算,得到了综合标准不确定度。在实验中引入不确定性的主要因素是取样体积、温度变化、玻璃器皿的容差等。根据所建立的不确定度模型,分别计算了LiCl - MgCl2 - h2o三元体系中LiCl和MgCl2盐溶解度的不确定度。结果表明,LiCl溶解度的最大不确定度不超过±0.41,最小不确定度不小于±0.17。此外,MgCl2溶解度的最大不确定度不超过±0.29质量百分比。得到了LiCl-MgCl2-H2O三元体系的溶解度不确定度图。该方法也可广泛用于溶液中热力学相关测量的评价。
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来源期刊
Journal of Chemical & Engineering Data
Journal of Chemical & Engineering Data 工程技术-工程:化工
CiteScore
5.20
自引率
19.20%
发文量
324
审稿时长
2.2 months
期刊介绍: The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.
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