Fig. 5. ¹⁴C-sucrose permeability (A) and arsenic species permeability (B), transfer of thio-DMA^V (C and E) and arsenite (D and F) across the intestinal Caco-2 barrier model after apical (a) incubation and transfer of thio-DMA^V (G) and arsenite (H) after incubation on both sides simultaneously. Displayed are arsenic concentrations in the acceptor (basolateral (b)) compartment [μM] (C and D) and percentage arsenic permeability (normalized to initial incubated concentration (2.5 μM)) (E, F, G and H). Because of the volume differences in the apical (0.5 mL) and basolateral (1 mL) compartments a correction factor of two for the transfer has to be considered. The data represent mean values of at least 3 independent determinations, +/±SD.