TY - JOUR
T1 - Kinetic study of Ni(II) and Zn(II) complexation with a pyridylazo extractant by a centrifugal liquid membrane method
AU - Yulizar, Yoki
AU - Ohashi, Akira
AU - Nagatani, Hirohisa
AU - Watarai, Hitoshi
N1 - Funding Information:
This study was financially supported by a grant-in-aid for Scientific Research (B) from the Ministry of Education, Science, Sports and Culture, Japan (No. 10440222) and for JSPS Fellows (2308).
PY - 2000/8/15
Y1 - 2000/8/15
N2 - 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) x 10 and (2.4 ± 0.6) x 103 M-1 s-1 at pH 6.50 ± 0.02, respectively. (C) 2000 Elsevier Science B.V.
AB - 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) x 10 and (2.4 ± 0.6) x 103 M-1 s-1 at pH 6.50 ± 0.02, respectively. (C) 2000 Elsevier Science B.V.
KW - 5-Br-PADAP
KW - Centrifugal liquid membrane method
KW - Extraction kinetics
KW - Interfacial complexation
KW - Liquid-liquid extraction
UR - http://www.scopus.com/inward/record.url?scp=0034663929&partnerID=8YFLogxK
U2 - 10.1016/S0003-2670(00)00970-3
DO - 10.1016/S0003-2670(00)00970-3
M3 - Article
AN - SCOPUS:0034663929
SN - 0003-2670
VL - 419
SP - 107
EP - 114
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1
ER -