Critical concentration of ‘unbound’ cadmium in the rabbit renal cortex

Critical concentration of ‘unbound’ cadmium in the rabbit renal cortex was around 13 μg Cd/g, which was far lower than the critical concentration of ‘total’ cadmium in the renal cortex, 200–300 μg Cd/g, and a little lower than the critical concentration of non-MT-Cd in the renal cortex, 35–60 μg Cd/g, respectively. The above result may suggest that it is necessary to identify the chemical form of ‘active’ cadmium in the renal cortex.