title: Solid phase extraction of zinc(II) using a PVC-based polymer inclusion membrane with di(2-ethylhexyl)phosphoric acid (D2EHPA) as the carrier.
abstract: A polymer inclusion membrane (PIM) is reported consisting of 45% (m/m) di(2-ethylhexyl)phosphoric acid (D2EHPA) immobilized in poly(vinyl chloride) (PVC) for use as a solid phase absorbent for selectively extracting Zn(II) from aqueous solutions in the presence of Cd(II), Co(II), Cu(II), Ni(II) and Fe(II). Interference from Fe(III) in the sample is eliminated by precipitation with orthophosphate prior to the extraction of Zn(II). Studies using a dual compartment transport cell have shown that the Zn(II) flux (2.58 x 10(-6)mol m(-2)s(-1)) is comparable to that observed for supported liquid membranes. The stoichiometry of the extracted complex is shown to be ZnR(2).HR, where R is the D2EHPA anion.
authors.affiliation: School of Chemistry, The University of Melbourne, Victoria 3010, Australia. s.kolev@unimelb.edu.au
authors.forename: Spas D
authors.initials: SD
authors.lastname: Kolev
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Baba
authors.forename: Robert W
authors.initials: RW
authors.lastname: Cattrall
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Tasaki
authors.forename: Natalie
authors.initials: N
authors.lastname: Pereira
authors.forename: Jilska M
authors.initials: JM
authors.lastname: Perera
authors.forename: Geoffrey W
authors.initials: GW
authors.lastname: Stevens
mesh_terms: D008567:Membranes, Artificial; D010755:Organophosphates; D010756:Phosphoric Acids; D011143:Polyvinyl Chloride; D052616:Solid Phase Extraction; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D008567:Membranes, Artificial; D010755:Organophosphates; D010756:Phosphoric Acids; C007377:di-2-(ethylhexyl)phosphoric acid; D011143:Polyvinyl Chloride; D015032:Zinc