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Kinetic study of Ni(II) and Zn(II) complexation with a pyridylazo extractant by a centrifugal liquid membrane method by Yoki Yulizar; Akira Ohashi; Hirohisa Nagatani; Hitoshi Watarai is a Chemistry article available to read on EtoBox.

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The centrifugal liquid membrane method, which provides an ultra-thin two phase liquid membrane system in a rotating glass cell, was successfully applied for the kinetic study of the liquid-liquid extraction of nickel(II) and zinc(II) with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) in toluene. The initial extraction rate of the metal(II) complexes depended upon the concentrations of the metal(II) ion and ligand. The rate determining step was revealed as 1:1 chelate formation of Ni(II) or Zn(II) with 5-Br-PADAP adsorbed at the liquid-liquid interface. The interfacial complexation rate constants of Ni(II)-5-Br-PADAP and Zn(II)-5-Br-PADAP were determined as (4.1±0.1)×10 and (2.4±0.6)×10 3 M -1 s -1 at pH 6.50±0.02, respectively.

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Author

Yoki Yulizar; Akira Ohashi; Hirohisa Nagatani; Hitoshi Watarai

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)