1969 Volume 42 Issue 10 Pages 2797-2800
The adsorption of cobaltous ions on fine glass beads was measured for dilute aqueous 60CoCl2 solutions with pH values from 2 to 10 and with concentrations from 10−6 to 10−10 mol/l. The amount of the adsorption of cobaltous ions on glass showed a maximum at pH near 9, and it was zero at both ends of the pH region for all the initial concentrations studied. This fact is considered to confirm the theory of radiocolloid formation by the so-called adsorption method. The mechanism of radiocolloid formation was further discussed in detail. The formation of radiocolloids was explained by the adsorption of cobaltous ions on foreign particles, while the formation of insoluble cobaltous hydroxide was ruled out. It was estimated from these measurements that a very minute amount of foreign particles is sufficient to adsorb cobaltous ions and to change a large franction of the solute to radiocolloid. It was emphasized that such an estimation can be made only by the measurement of the adsorption, expressed by the unit of mol/cm2 as in the case of the present experiment, instead of the conventional unit of cpm/g or percent adsoiption.
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