Discussion on the thermodynamic calculation by distribution constant in Journal of Contaminant Hydrology 243 (2021) 103906

Abstract

This comment discussed the calculation of thermodynamic parameters about the paper published in Journal of Contaminant Hydrology 243 (2021) 103906. Despite the paper's novelty and innovation, the distribution constant (K_d) with a dimension of L/mg is not the standard equilibrium constant (K^o), therefore, it cannot be used to calculate the thermodynamic parameters. By analyzing the incorrect results and providing the reasonable method for calculating the thermodynamic parameters，this comment is helpful to understand the calculation principle of thermodynamic parameters by the distribution constant and avoid the misuse of incorrect formulas.

Keywords: Adsorption; Distribution constant; The standard equilibrium constant; Thermodynamic calculation.