Table 1 Concentrations of heavy metals (mean ± SD, mg kg− 1) in roadside soil samples in the study areas.
Studied sites | Pb | Cr | Ni | Cd |
---|---|---|---|---|
commercial | 28.0 ± 11.8 | 21.6 ± 10.6 | 15.5 ± 5.3 | 6.3 ± 0.4 |
residential | 29.1 ± 8.6 | 22.1 ± 5.3 | 17.3 ± 7.4 | 6.4 ± 0.3 |
industrial | 31.4 ± 19.7 | 14.8 ± 8.9 | 11.3 ± 7.2 | 5.8 ± 3.0 |
rural | 11.1 ± 3.1 | 17.1 ± 3 | 17.3 ± 3 | 6.1 ± 0.2 |