SORPTION AND DESORPTION OF RADIOIODINE ON CALCAREOUS SOIL AND ITS SOLID COMPONENTS

The effect of different solid components of calcareous soil on the ret ention of I was investigated by a batch technique and selective extrac tion method, and the effect of gamma-irradiation was also investigated . The sorption and desorption isotherms of I on the one untreated, thr ee treated soils and the calcareous soil irradiated with gamma-rays we re determined at 30 degrees C, pH 8.1+/-0.2 and in the presence of 1.0 x10(-4)M or 0.67x10(-5)M CaCl2. It was found that the sorption-desorpt ion hysteresis on the calcareous soil actually occurs on the same time scale, that iodine can be easily transported in the calcareous soil a nd that the exceptionally high contribution of organic matter to the i odine sorption is demonstrated.