Fig. 6

Effect of polydispersity on DG-model output. Comparison of DG-predicted fraction of mass deposited (f _D) or exposure concentrations (mg ml⁻¹ in bottom 10 μm of well) from 0 to 24 h for mean d _H (Table 1) and volume size distribution from DLS (Additional file 1: Figure S3) for a, CeO₂, b, TiO₂, c, Fe₂O₃ and d, SiO₂ ENMs (C ₀ = 0.1 mg ml⁻¹, column height = 3 mm, reflective boundary condition (no binding))