where Cn represents the mean metal concentrations in a specific
vegetable on fresh weight basis (mg kg_1), Dn indicated average
daily intake rate of a specific vegetable in a year, RfD represents safe
level of exposure by oral for lifetime, and Bw is the average body
weight (taken as 70 kg for adults). The dietary reference intakes
(DRI) of the elements were taken as RfD (FNB, 2004), except Cd and
Pb, for which the maximum allowed levels (ML) were considered
(EC, 2006).