Comparison of Models for the Prediction of the Electrical Conductivity of Electrolyte Solutions

Saman Naseri Boroujeni, Xiaodong Liang, Bjørn Maribo-Mogensen, Georgios M. Kontogeorgis*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

It has been almost one century since Onsager developed the limiting law of equivalent conductivity of electrolyte solutions. Thenceforth, many models have been developed; however, they have not been assessed thoroughly and systematically. This paper comprehensively investigates the accuracy and reliability of six equivalent conductivity models, namely, the Debye-Hückel-Onsager limiting law (DHOLL), extended law (DHOEE), smaller ion shell (DHOSiS), along with the simplified and full mean spherical approximation (MSA, MSA-Simple), and Quint-Viallard (QV). To this aim, we have prepared a database of experimental data for 126 electrolytes. The accuracy of the models is examined with the help of graphical methods and error analysis over a wide range of concentrations ([0, 18] mol/L) and temperatures ([0, 100]°C). Moreover, the origin of possible errors of models is inspected with a term-by-term analysis of relaxation and electrophoretic effects. It is shown that the absolute average deviation of models depends highly on the electrolyte type, and it is generally smaller for 1:1 salts, especially at low concentrations (less than 5%). The error evolution with concentration also reveals that MSA-Simple and DHOEE are more reliable over a wide range of concentration and electrolyte types. It is concluded that MSA-Simple predicts the equivalent conductivity at lower temperatures and the trend of versus T more satisfactorily than the other models.
Original languageEnglish
JournalIndustrial and Engineering Chemistry Research
Volume61
Issue number8
Pages (from-to)3168-3185
ISSN0888-5885
DOIs
Publication statusPublished - 2022

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