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Volumetric Properties of Aqueous NaCl−MgCl2−H2O and KCl−MgCl2−H2O Solutions and Their Correlation with the Pitzer Model

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Abstract

The densities of aqueous solutions NaCl–MgCl2–H2O and KCl–MgCl2–H2O have been measured by vibrating-tube densimetry at 5 K intervals over the temperature range of 288 ≤ T/K ≤ 323 at atmospheric pressure. An experimental study was carried out for four total ionic strengths, for which the ionic strength fraction of MgCl2 was 0.2, 0.4, 0.6 and 0.8. The ion interaction approach developed by Pitzer was used to correlate the volumetric properties of aqueous mixtures. The mixing parameters of the Pitzer model were obtained by the least squares method. The calculated results are in good agreement with the experimental and literature data. The volume of mixing at constant ionic strength and at 298.15 K was calculated.

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Acknowledgements

Financial support from the National Key R&D Program of China (2017YFC0602801), the Natural Science Foundation of Qinghai Province (2017−ZJ−704) and the International Partnership Program of the Chinese Academy of Sciences (122363KYSB20190033) is acknowledged.

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Authors and Affiliations

  1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, People’s Republic of China

    Xiuzhen Ma, Bin Hu, Wu Li & Yaping Dong

  2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, 810008, People’s Republic of China

    Xiuzhen Ma, Bin Hu & Wu Li

  3. Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining, 810008, People’s Republic of China

    Yaping Dong

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  1. Xiuzhen Ma
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  2. Bin Hu
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Correspondence to Bin Hu.

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Ma, X., Hu, B., Li, W. et al. Volumetric Properties of Aqueous NaCl−MgCl2−H2O and KCl−MgCl2−H2O Solutions and Their Correlation with the Pitzer Model. J Solution Chem 49, 1339–1348 (2020). https://doi.org/10.1007/s10953-020-01004-z

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