Abstract
The equilibrium distribution of selenium in hydrochloric acid medium and with the chloride salt of tri‐iso‐octylamine (TIOA) in xylene was studied. Experimental data were analyzed graphically and numerically to determine the stoichiometry of the extraction species. It was found that the extraction reaction is endothermic (ΔH = +17.060 KJ/mol). Selenium was extracted by the reaction: The effect of extractant concentration, equilibration period, diluents, and diverse ion and stripping agents on the extraction of selenium were studied. The distribution constant and the thermodynamic parameters enthalpy (ΔH), entropy (ΔS), and free energy (ΔG) were evaluated.
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