Extraction of neodymium(III) at trace level with di(2-ethyl-hexyl)phosphoric acid in hexane

J. M. Sánchez; M. Hidalgo; V. Salvadó; M. Valiente

doi:10.1080/07366299908934623

Extraction of neodymium(III) at trace level with di(2-ethyl-hexyl)phosphoric acid in hexane

J. M. Sánchez, M. Hidalgo, V. Salvadó, M. Valiente

Department of Chemistry

Research output: Contribution to journal › Article › Research › peer-review

34 Citations (Scopus)

Abstract

The distribution of neodymium(III) between acidic aqueous nitrate solutions and organic solutions of di(2-ethyl-hexyl)phosphoric acid (D2EHPA) in hexane has been studied for different extractant and metal ratios at constant aqueous ionic strength 0.1 M (Na+, H+-NO3-). The distribution data have been evaluated by both graphical and numerical analysis, in order to determine the speciation in the organic phase. The results obtained suggest the formation of two complexes in the organic phase: NdA3·3HA, which is predominant when the extractant/metal ratio is higher than one, and NdA3, which is the main species when the ratio is equal to one. For lower concentrations of extractant it has been found that the possible formation of species at the interface creates difficulties in the modelling of the extraction process.

Original language	English
Pages (from-to)	455-474
Journal	Solvent Extraction and Ion Exchange
Volume	17
Issue number	3
DOIs	https://doi.org/10.1080/07366299908934623
Publication status	Published - 1 Jan 1999

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title = "Extraction of neodymium(III) at trace level with di(2-ethyl-hexyl)phosphoric acid in hexane",

abstract = "The distribution of neodymium(III) between acidic aqueous nitrate solutions and organic solutions of di(2-ethyl-hexyl)phosphoric acid (D2EHPA) in hexane has been studied for different extractant and metal ratios at constant aqueous ionic strength 0.1 M (Na+, H+-NO3-). The distribution data have been evaluated by both graphical and numerical analysis, in order to determine the speciation in the organic phase. The results obtained suggest the formation of two complexes in the organic phase: NdA3·3HA, which is predominant when the extractant/metal ratio is higher than one, and NdA3, which is the main species when the ratio is equal to one. For lower concentrations of extractant it has been found that the possible formation of species at the interface creates difficulties in the modelling of the extraction process.",

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T1 - Extraction of neodymium(III) at trace level with di(2-ethyl-hexyl)phosphoric acid in hexane

AU - Sánchez, J. M.

AU - Hidalgo, M.

AU - Salvadó, V.

AU - Valiente, M.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The distribution of neodymium(III) between acidic aqueous nitrate solutions and organic solutions of di(2-ethyl-hexyl)phosphoric acid (D2EHPA) in hexane has been studied for different extractant and metal ratios at constant aqueous ionic strength 0.1 M (Na+, H+-NO3-). The distribution data have been evaluated by both graphical and numerical analysis, in order to determine the speciation in the organic phase. The results obtained suggest the formation of two complexes in the organic phase: NdA3·3HA, which is predominant when the extractant/metal ratio is higher than one, and NdA3, which is the main species when the ratio is equal to one. For lower concentrations of extractant it has been found that the possible formation of species at the interface creates difficulties in the modelling of the extraction process.

AB - The distribution of neodymium(III) between acidic aqueous nitrate solutions and organic solutions of di(2-ethyl-hexyl)phosphoric acid (D2EHPA) in hexane has been studied for different extractant and metal ratios at constant aqueous ionic strength 0.1 M (Na+, H+-NO3-). The distribution data have been evaluated by both graphical and numerical analysis, in order to determine the speciation in the organic phase. The results obtained suggest the formation of two complexes in the organic phase: NdA3·3HA, which is predominant when the extractant/metal ratio is higher than one, and NdA3, which is the main species when the ratio is equal to one. For lower concentrations of extractant it has been found that the possible formation of species at the interface creates difficulties in the modelling of the extraction process.

U2 - 10.1080/07366299908934623

DO - 10.1080/07366299908934623

M3 - Article

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SP - 455

EP - 474

JO - Solvent Extraction and Ion Exchange

JF - Solvent Extraction and Ion Exchange

SN - 0736-6299

IS - 3

ER -

Extraction of neodymium(III) at trace level with di(2-ethyl-hexyl)phosphoric acid in hexane

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