Table 3.
Heavy metal concentrations in surface soils and their physical and chemical properties.
| Mine dump (Na)=36) | Uncultivated (N=6) | Household garden (N=30) | Control (N=18) | |
|---|---|---|---|---|
| Cd (mg/kg) | 4.4±3.6b) | 1.8±0.5 | 1.8±0.9 | 0.9±0.4 |
| Cu (mg/kg) | 1,953±1,811 | 183±92 | 269±299 | 29±9 |
| Pb (mg/kg) | 1,028±616 | 63±26 | 84±54 | 18±3 |
| Zn (mg/kg) | 419±462 | 136±30 | 175±68 | 97±14 |
|
| ||||
| pH | 4.1±0.7 | 5.3±0.8 | 5.6±0.9 | 5.6±0.5 |
| LOI (%) | 3.2±1.4 | 7.9±0.9 | 7.7±1.7 | 6.6±1.0 |
| CEC (meq/100g) | 11.4±3.4 | 17.5±1.9 | 23.2±10.5 | 30.1±14.7 |
| Sand (%) | 86±7 | 66±2 | 70±6 | 65±4 |
| Silt (%) | 8±3 | 22±1 | 20±5 | 23±6 |
| Clay (%) | 6±4 | 12±1 | 10±4 | 12±4 |
a)
Number of samples;
b)
Mean ± standard deviation