Analusis 28, 324-329 (2000)
DOI: 10.1051/analusis:2000122

Synergistic extraction of some divalent metal cations with 3-phenyl-4-benzoylisoxazol-5-one and P=O donor ligands in chloroform

K. Torkestani, G.J. Goetz-Grandmont and J.-P. Brunette

Laboratoire de Chimie Analytique et Minérale,Unité Mixte Université Louis Pasteur, CNRS N° 7512, E.C.P.M., 25, rue Becquerel, 67087 Strasbourg Cedex 02, France

(Received January 14, 2000; revised May 23, 2000; accepted May 30, 2000.)

Abstract
The synergistic extraction of some divalent cations (Cd, Cu, Mn and Zn) in chloroform, with 3-phenyl-4-benzoylisoxazol-5-one (HPBI) in the presence of various synergistic agents: trioctylphosphine oxide (TOPO), octyl(phenyl) (N,N-diisobutylcarbamoylmethyl)phosphine oxide (CMPO) and bis(diphenylphosphinyl)methane (BDPPM) has been studied. It is compared with the extraction in toluene. Due to various factors (e.g. extractant-diluent or extractant-synergist interactions), the stoichiometry of the extracted species, the selectivity and the magnitude of the synergism depend on the diluent and on the synergist. In chloroform, the extraction with HPBI and TOPO follows the order Cu > Zn > Mn > Cd (Mn > Zn in toluene). In chloroform, the synergistic extraction of cadmium follows the order BDPPM > CMPO > TOPO (TOPO > CMPO in toluene). The formation constants of Cd(PBI)⁺ and Cd(PBI)₂ in aqueous medium have been evaluated.

Key words: 3-Phenyl-4-benzoylisoxazol-5-one -- cadmium -- diluent effect -- liquid-liquid extraction -- synergism.


© EDP Sciences, Wiley-VCH 2000