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Solvent Extraction of Zinc(II) in Several Aqueous Chloride Media by Trilaurylammonium Chloride in Toluene

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Abstract

The study of the chemical equilibria involved in the solvent extraction of ZnCl2 by trilaurylammonium chloride (TLAHCL) in toluene has been carried out at three different aqueous chloride concentrations, I (I=1.0, 2.0 and 3.0 mol dm−3). The experimental data, obtained by measurement of the metal distribution as a function of the extractant concentration, have been treated using numerical methods. The extraction process is explained by the following extraction reactions: Zn2++2Cl−+2TLAHCI(org) ⇌ ZnCl2(TLAHCI)2(org),K2; Zn2++2Cl−+3TLAHCI(org) ⇌ ZnCl2(TLAHCL)3(org), K3; 3Zn2++6Cl−+6TLAHCI(org) ⇌ Zn3Cl6(TLAHCI)6(org), K6. The species formed in the organic phase seems to be independent of the aqueous chloride concentration, while the values of the extraction constants are different for each chloride concentration (I=1.0, log K2=4.38, log K3=6.06, log K6=15.1; I=2.0, log K2=4.51; logK3=6.17, log K6=14.9; I=3.0, log K2=4.37, log K3=5.81). The values obtained were correlated using the specific-interaction theory.

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Authors and Affiliations

  1. Dept. de Química. Col.legi Universitari de Girona, Universidad Autónoma de Barcelona, Girona, Spain

    Amalia Masana

  2. Dept. de Química. Química Analítica, Universidad Autónoma de Barcelona, Barcelona, Spain

    Manuel Valiente

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  1. Amalia Masana
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  2. Manuel Valiente
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Masana, A., Valiente, M. Solvent Extraction of Zinc(II) in Several Aqueous Chloride Media by Trilaurylammonium Chloride in Toluene. ANAL. SCI. 4, 63–68 (1988). https://doi.org/10.2116/analsci.4.63

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  • DOI: https://doi.org/10.2116/analsci.4.63

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