SORPTION OF RADIOIODINE ON ORGANIC-RICH SOIL, CLAY-MINERALS AND ALUMINA

Batch method was used in investigate the sorption behavior of radioiodine on organic rich soil alumina, chlorite-illite clay mixture and bentonite. I-131 was used as tracer. The grain sizes of the samples used were all below 38 mum. A rather slow kinetics was observed for the adsorption of radioiodine on organic rich soil. The distribution ratio increased with increasing solution/solid (V/m) ratio, and the contact time. The pH of the synthetic groundwater did not change the distribution ratio appreciably. The soil biomass however, showed a striking effect on the adsorption of radioiodine. Among the clay minerals, the highest distribution ratio value was found for chlorite-illite clay mixture. All the values were however well below those of the organic rich soil. The sorption data were fined to Freundlich and Dubinin-Radushkevich type isotherms. Mean energies of adsorption, as well as the affinity ratios of the sorption sites to iodine and chlorine were calculated.