Figure 5From: Synergistic effect of co-exposure to carbon black and Fe2O3 nanoparticles on oxidative stress in cultured lung epithelial cells The mass of dissolved Fe2+ and Fe3+ ions normalized to carbon black mass as a function of time when the carbon-black/Fe 2 O 3 particles was incubated in 0.75 M H 2 SO 4 (100 mL) at 40°C for different times.Back to article page