one of the most studied areas. For instance, Rizzato et al. (8) found 695 Ilg/kg Zn and 758 Ilg/kg Fe in 6 BAL from normal
subjects. Sabbioni et al. (9) reported about 500 Ilg/kg Zn and Fe, and 200 Ilg/kg Cu in unexposed persons. Finally
SuI otto et al. (l0) give averages of 700 Ilg/kg Fe and 830 Ilg/kg Zn for a control group, also from Italy.