The concentrations of heavy metals were generally higher in
samples from Tahtay Wukro, which is located downstream of the
Shaba Tannery and receives effluents from the tannery and
effluents of Wukro town discharged into the river; Laelay Wukro
is located upstream of the Sheba Tannery. The results in Table 4 are
in agreement with previous studies on the uptake of heavy metals
in edible parts of vegetables grown with continuous wastewater
irrigation (Khan et al., 2007; Liu et al., 2005; Muchuweti et al.,
2006; Sharma et al., 2007)