Concentrations of heavy metals (Cu, Pb, Zn, Ni, Cd) in cassava grown on farmlands along highways
in Owerri, was investigated. Cassava leaves and root samples were harvested from cassava farms
along three major roads with high traffic density and another rural road that served as control
location. Standard laboratory procedures to determine the concentration of these metals were
adopted using Atomic Absorption Spectrophotometer. The metal concentrations in mg/kg in cassava
root showed high levels of Cu (6.29±0.0346), Zn (8.49±2.243), Pb (0.5267±0.3156) and Cd
(0.1167±0.0833). The concentrations of the heavy metals in the cassava leaves were of the order: Zn
> Cu >Pb> Ni > Cd. Soil plant transfer factor values for all the metals in all the sites indicated
medium accumulation. Heavy metal concentrations in soil showed significant correlation with
concentrations in cassava root with no significant statistical differences in bioaccumulation of heavy
metals in different parts of cassava. The overall results showed evidence of some heavy metal
pollution on the soils and cassava plant.
