Extraction of manganese(II), iron(II), cobalt(II), nickel(II), copper(II), zinc(II), and cadmium(II) into 1,2-dichloroethane with 4,7-diphenyl-1, 10-phenanthroline and perchlorate.
The extraction of the ion-association complexes formed by Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)-4,7-diphenyl-1, 10-phenanthroline (BP) chelates and perchlorate ions into 1,2-dichloroethane has been investigated. Extraction equilibrium for Mn(II), Cu(II), Zn(II) and Cd(II) is reached within 1 hr, but equilibration for Fe(II), Co(II) and Ni(II) is very slow; the equilibration rate depends on the structure of the chelating agent, the nature of the organic solvent, and pH. In the extraction equilibrium of Co(II) the rate-determining step seems to be the complexation of hydrated Co(II) by BP in the aqueous phase.
Honjo
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Department of Chemistry, Faculty of Science, Kanazawa University, Kanazawa, Ishikawa 920, Japan.
Okazaki
A
A
Terada
K
K
Kiba
T
T