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

The effect of different solid soil components of calcareous soils on t he retention of SeO3 has been investigated by a batch technique and se lective extraction method. The sorption and desorption isotherms of Se O3 on the untreated calcareous soil and the three treated soils were d etermined at 20 degrees C, pH 7.8+/-0.2 and in the presence of 0.001 M CaCl2. It was found that all isotherms are linear, the sorption-desor ption hysteresis for untreated soil and treated soils is obvious and t he retention of SeO3 in calcareous soil is mainly attributed to the ox ides.