Abstract
Abstract The adsorption of copper(II) on a hydrous oxide colloid of iron formed by base hydrolysis in the presence of the adsorbate metal has been studied in two ways. Filtration-AAS of equilibrated solutions yielded data which fit well to a single variant adsorption isotherm even at high adsorbate metal concentration thus precluding the need for multivariant fitting. These same colloidal species were kinetically analyzed by reaction of copper with the chromophore reagent EHTTT (a = 13700 Mࢤ1 cmࢤ1 at 434 nm) which revealed the presence of three components, other than the very labile “free” species. Kinetic differentiation of thermodynamically similar sites may result from diffusion control of metal ion release.
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