Enhanced bioaccumulation of cadmium in carp in the presence of titanium dioxide nanoparticles

In this study adsorption of Cd onto TiO 2 nanoparticles and natural sediment particles (SP) were studied and the facilitated transports of Cd into carp by TiO 2 nanoparticles and SP were assessed by bioaccumulation tests exposing carp ( Cyprinus carpio) to Cd contaminated water in the presence of TiO 2 and SP respectively. The results show that TiO 2 nanoparticles had a significantly stronger adsorption capacity for Cd than SP. The presence of SP did not have significant influence on the accumulation of Cd in carp during the 25 d of exposure. However, the presence of TiO 2 nanoparticles greatly enhanced the accumulation of Cd in carp. After 25 d of exposure Cd concentration in carp increased by 146%, and the value was 22.3 and 9.07 μg/g, respectively. And there is a positive correlation between Cd and TiO 2 concentration. Considerable Cd and TiO 2 accumulated in viscera and gills of the fish.