In this study, translocation factor (TF) and bioconcentration factor
(BCF) were calculated using the ratio of Pb concentration in roots and
shoots [TF = Cshoot / Croot] and the ratio of PbHCl concentration in soils
and shoots [BCF = Cshoot / Csoil], respectively (Bu-Olayan and Thomas,
2009). To obtain Pb concentration in shoots the values found for leaves
and for stems were multiplied by the total biomass of each organ and
they were added to each, finding the total mass of Pb in aerial organs.
Then, this result was divided by the total mass of the aerial organs
(stems plus leaves)