SOLVENT IMPREGNATED RESINS CONTAINING DI(2-ETHYL-HEXYL)PHOSPHORIC ACID.II. STUDY OF THE DISTRIBUTION EQUILIBRIA OF Zn(II), Cu(II) AND Cd(II).
- 1 March 1994
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 12 (2), 371-391
- https://doi.org/10.1080/07366299408918215
Abstract
The extraction of Zn(II), Cu(II) and Cd(II) from nitrate solutions at 0.1 M ionic strength by impregnated resins containing di(2-ethylhexyl)phosphoric acid has been studied at 25 °C. The distribution coefficient was determined as a function of both pH and extractant concentration in the resin phase. The data were analyzed graphically using the slope analysis method, and numerically using the program LETAGROP-DISTR. The composition of the extracted species in the resin phase has been determined. Analysis of the results showed that the extraction of these metal ions can be explained assuming the formation of metal complexes in the resin phase with a general composition ML2(HL) q where q takes different values depending on the metal. An extraction reaction is proposed and the extraction constants of these species are given. Finally, a comparison between the extraction of Zn(II), Cu(II) and Cd(II) by di(2-ethylhexyl)phosphoric acid into Amberlite XAD2 and the extraction using organic solvents has been made.Keywords
This publication has 6 references indexed in Scilit:
- Liquid-solid extraction of gold(III) from aqueous chloride solutions by macroporous resins impregnated with triisobutyl phosphine sulfide (Cyanex 471)Reactive Polymers, 1992
- SOLVENT EXTRACTION OF ZINC(II) BY ORGANOPHOSPHORUS ACIDS COMPOUNDS FROM PERCHLORATE SOLUTIONS.Solvent Extraction and Ion Exchange, 1992
- Solvent Extraction, Membranes, and Ion Exchange in Hydrometallurgical Dilute Metals SeparationSeparation Science and Technology, 1987
- The extraction of zinc(II) from sulphate and perchlorate solutions by di(2-ethylhexyl)phosphoric acid dissolved in Isopar-HHydrometallurgy, 1984
- High-speed Computers as a Supplement to Graphical Methods. 12. Application of LETAGROP to Data for Liquid-liquid Distribution Equilibria.Acta Chemica Scandinavica, 1971
- Determination of the equivalence point in potentiometric titrations. Part IIThe Analyst, 1952