Fig. 2From: Kinetics and dissolution of intratracheally administered nickel oxide nanomaterials in ratsConcentration of dissolved Ni ions in the artificial fluids for four types of NiO. Ultrapure water, saline, hydrogen peroxide (H2O2) solutions (10 and 200 μM), artificial lysosomal fluid, and Gamble’s solution (artificial interstitium fluid) were used as the artificial fluids. The broken line indicates the Ni concentrations (both particle and ion) in the suspension. a NiO A. b NiO B. c NiO C. d NiO DBack to article page