Abstract
The sorption of microamounts of Eu spiked with 152,154Eu on the artificial stone, pottery, was studied at varoius conditions. Three kinds of pottery (red, black, and white), in addition to the raw material (potter’s clay) of the red kind, were tested. The pottery shows high sorption power with respect to the radiotracer depending on the kind of pottery. The uptake percentages gradually increase with the contact time, weight of pottery, or pH of the aqueous solution, attaining saturation at certain values. The amounts of Eu3+ required for the saturation are 7.38, 7.00, 5.93, and 1.64 (mmol Eu) (g pottery)−1 for raw, red, black, and white samples, respectively. This sequence is parallel to that of the uptake percentage, which is related to the surface area of each material. The sorption presumably occurs via adsorption and ion exchange. The results were applied to decontamination of low-level liquid radioactive waste by filtration through a pot of red pottery; the effluent was free from the radiotracer.
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