The toxicities of CuO NPs, CuO bulk, and Cu2+ are different, but the 30-min half maximal effective concentration (EC50) of ZnO NPs indicate that the toxic effects of ZnO NPs, bulk ZnO particles and Zn2+ are similar [52,53,54].
Article The Toxic Effects and Mechanisms of CuO and ZnO Nanoparticles