Solubility and Extraction of Metal Ions in Inorganic Acid–Potassium Bis(alkylpolyoxyethylene)phosphate–Water Systems

• Published in: Russian Journal of Physical Chemistry A Vol. 97; no. 2; pp. 357 - 361
• Main Authors: Denisova, S. A., Svezhov, D. A., Elokhov, A. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-02-2023; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Halides; Inorganic acids; Metal halides; Physical Chemistry; Physical Chemistry of Solutions; Potassium; Salting; Sulfuric acid; Thallium; Titration; salting-out; liquid extraction; halide acid complexes; anionic surfactants
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024423020048

The boundaries of the segregation region in sulfuric (nitric, chloric, hydrochloric) acid–potassium bis(alkylpolyoxyethylene) phosphate–water systems at 25°С have been determined by isothermal titration. The salting-out ability of the inorganic acid was found to increase with a decrease in the absolute value of the Gibbs energy of anion hydration. Based on the obtained diagrams, the optimum parameters of extraction were determined, and tendencies in the distribution of some metal ions in the sulfuric acid–potassium bis(alkylpolyoxyethylene) phosphate–water system were studied. Conditions for quantitative extraction of thallium(III) in the presence of alkali metal halides were found.