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Solvent Extraction and Ion Exchange Volume 19, 2001 - Issue 3
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Original Articles

THERMODYNAMIC STUDY OF LIQUID-LIQUID EXTRACTION OF ARSENIC(V) BY NMPL FROM H2SO4 MEDIUM

M. Avila-Rodríguez Instituto de investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, Guanajuato, Gto., 36000, MéxicoCorrespondence[email protected]
,
J. A. Barrón-Zambrano Instituto de investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, Guanajuato, Gto., 36000, México
,
R. Navarro-Mendoza Instituto de investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, Guanajuato, Gto., 36000, México
&
T. I. Saucedo-Medina Instituto de investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, Guanajuato, Gto., 36000, México
Pages 457-472 | Received 19 Jan 2000, Published online: 15 Feb 2007
 
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Abstract

The results obtained from the extraction of As(V) by 1-(2,6-dimethylheptyl-4-oxy)-3 methyl-1-oxo-Δ3-phospholen (NMPL) are presented in this paper. The conditions of extraction as a function of the extractant and H2SO4 concentrations have been determined. The influence of the extraction of water and sulfuric acid in the extraction process of As(V) has been analyzed. A model of extraction based on the Sergievskii-Dannus' equation has been developed. This model considers the variation of activity coefficients in the aqueous phase and in the organic phase. Thanks to this model its has been possible to predict the theo- retical curves of distribution of H2O, H2SO4 and H3AsO4, in accord with the experimental data.

ACKNOWLEDGMENT

This study was financed by CONACYT as part of project 32244-E.

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