Factors affecting interaction of radioiodide and iodate species with soil

The uptake of radioiodide and iodate species by soil dried at 100 degrees C (particle size of less than 0.25 mm) was studied in laboratory batch experiments for three major groups of variables: (i) experimental conditions (ambient temperature, liquid-to-solid ratio and contact time), (ii) solid phase conditions (grain size and washing treatment), and (iii) liquid phase conditions (pH, and concentrations of electrolytes and carrier). Effects of the presence of soluble and insoluble organic matter were also investigated in relation to radioiodine uptake by the soil. Plural uptake mechanisms were considered for iodide species, while a simple anion exchange process for iodate.