Skip to Main content Skip to Navigation
Journal articles

SOLVENT EXTRACTION OF NICKEL(II) BY 2-ETHYLHEXANAL OXIME FROM VARIOUS AQUEOUS SOLUTIONS

Abstract : The extraction of nickel(II) from various aqueous solutions by 2-ethylhexanal oxime (EHO) in dodecane has been studied as a function of total concentrations of extractant, metal and salts and of the equilibrium pH. In the absence of salts, as well as in the presence of ammonium and sodium nitrates, the extracted complex, is: Ni(EHO)(5)(H2O). In the complexing chloride medium, two different species exist, depending on acidity: for pH lower than 4, Ni(EHO)(3) Cl-2(H2O) and pH above 4, Ni(EHO)(4)Cl(H2O). 2-ethylhexanal oxime forms multimers. In dodecane The knowledge of these association degrees is very important when EHO is used as an extracting reagent. The EHO aggregation numbers have been determined by the VPO method (Vapour Pressure Osmometry) at three temperatures (24, 29 and 34 degreesC) in a wide concentration range (0.03-0.77 mol.kg(-1)). EHO forms monomers, dimers and trimers. The formation constants of these aggregates have been estimated by numerical analysis.
Document type :
Journal articles
Complete list of metadatas

https://hal-centralesupelec.archives-ouvertes.fr/hal-01255159
Contributor : Catherine Kruch <>
Submitted on : Wednesday, January 13, 2016 - 11:36:22 AM
Last modification on : Wednesday, July 1, 2020 - 4:30:04 PM

Identifiers

Collections

Citation

A. Buch, D. Pareau, M. Stambouli, Geoffroy Durand. SOLVENT EXTRACTION OF NICKEL(II) BY 2-ETHYLHEXANAL OXIME FROM VARIOUS AQUEOUS SOLUTIONS. Solvent Extraction and Ion Exchange, Taylor & Francis, 2001, 19 (2), pp.277-299. ⟨10.1081/SEI-100102696⟩. ⟨hal-01255159⟩

Share

Metrics

Record views

140