Radoiodide sorption to sedimnt minerals

摘要

Laboratory studies were conducted to quantify and understand the processes by which iodide (I~-) sorbs to minerals found in subsurface arid sediments. Little or no I~- sorbed to montmorillonite (K_d chemical bounds -0.42 +-0.08 mL/g), quzrtz (k_dchemical bounds 0.04+-0.02mL/g), vermiculite (K_dchemical bounds 0.56+-0.21 mL/g), calcite (k_dchemical bounds 0.04+-0.01 mL/g), goethite (K_d chemical bounds 0.10+-0.03 mL/g), or chlorite (K_dchemical bounds -0.22+-0.06 mL/g). A significant amount of I~- sorbed to illite (K_d chemical bounds 15.14+-2.84 mL/g).). Upon treating the iodide-laden illite with dissolved F~-, Cl~-, Br~-, or ~(127)I~-, desorption (or isotopic exchange in the case of ~(127)I) removed, respectively, 43+-3