Comment on The Nonlinear Decrement in Static Permittivity of Electrolytes in High-Polarity Solvents

In a recent article [J. Solution Chem. 50, 105 (2021)], Le and Tran discussed the nonlinear decrement of static permittivity of electrolyte solutions described by the Langevin function and its role in predicting activity coefficients using the extended Debye-Huckel (EDH) theory [Shilov I.Yu., Lyashchenko A.K. J. Phys. Chem. B 119, 10087 (2015)]. In this comment, we consider the mathematical description of permittivity concentration dependence, rebut some statements made by Le and Tran and provide an example of employing the Langevin function in the EDH theory.

Automated summary

The article discusses the nonlinear decrement of static permittivity of electrolyte solutions and the use of the Langevin function in the EDH theory. It also rebuts some statements made by Le and Tran.