Behaviors of americium in aqueous solutions containing iron.

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Abstract
The effect of iron on the colloidal behaviors of americium in near-neutral solutions was studied by applying the ultrafiltration method to americium (241Am) solutions, iron (59Fe) solutions and americium/iron mixed solutions. The concentration of americium was typically about 10−9M and that of iron 10−7M. Some properties of colloidal particles were deduced from the particle-size distributions. It was revealed that the colloidal americium particles may represent pseudo colloids, which behave together with iron true colloids. The proposed simple model, in which the iron true colloid is assumed to be a chain-like polymer composed of hydroxide, is able to describe the particle-size distribution of iron colloids observed in this work. It was also found that the adsorption of americium and iron on the vessel walls depends on the particle-size distributions.

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