Figure 6From: Comparative absorption, distribution, and excretion of titanium dioxide and zinc oxide nanoparticles after repeated oral administration Excretion of nanoparticles after 13 weeks of consecutive oral administration. The concentrations of Ti in urine (A) and feces (C) were measured using an ICP-MS for TiO2 treatment groups. The concentrations of Zn in urine (B) and feces (D) were measured using an ICP-MS for ZnO treatment groups. Values are mean ± S.D. and n = 11. Significance versus vehicle control: * p < 0.05.Back to article page