Effect of stirring on the ion-association extraction of copper and zinc 4,7-diphenyl-1,10-phenanthroline complexes.
The effect of high-speed stirring on the extraction of 4,7-diphenyl-1,10-phenanthroline (L) complexes into chloroform was examined for the copper(II)/perchlorate, copper(II)/chloride and zinc(II)/perchlorate systems. A significant reversible decrease in the organic phase concentration in all the systems was caused by stirring, but most evidently in the copper/perchlorate system, where the effect depended on the stirring rate, concentration of L, and metal-ion concentration. The phenomena are primarily explained in terms of an interfacial adsorption of the extracted complex, according to the Langmuir adsorption isotherm.
Watarai
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Department of Chemistry, Faculty of Education, Akita University, Akita 010, Japan.