Table 4.
Heavy metal concentrations in plants from mining and control areas. (Unit : μg g−1, DW).
| Site | Na) | Cd | Cu | Pb | Zn | |
|---|---|---|---|---|---|---|
| Corn grain | Mining area | 3 | 0.41±0.07b) | 8.95±4.12 | 0.41±0.11 | 40.7±10.3 |
| Control area | 1 | 0.15 | 1.60 | 0.18 | 20.0 | |
| Ratioc) | 2.7 | 5.6 | 2.3 | 2.1 | ||
|
| ||||||
| Jujube grain | Mining area | 6 | 0.47±0.02 | 9.17±0.72 | 1.19±0.04 | 22.5±2.80 |
| Control area | 2 | 0.44±0.01 | 8.43±0.09 | 0.10±0.02 | 18.0±0.40 | |
| Ratio | 1.1 | 1.1 | 1.9d) | 1.3d) | ||
|
| ||||||
| Perilla leaves | Mining area | 3 | 0.24±0.04 | 26.0±2.62 | 1.33±0.12 | 80.7±28.2 |
| Control area | 2 | 0.18±0.02 | 21.6±0.85 | 1.13±0.10 | 52.8±0.60 | |
| Ratio | 1.3 | 1.2 | 1.2 | 1.5 | ||
|
| ||||||
| Red pepper | Mining area | 6 | 0.34±0.05 | 25.5±5.86 | 1.22±0.28 | 32.2±3.29 |
| Control area | 4 | 0.27±0.02 | 8.45±0.62 | 0.38±0.07 | 28.1±0.56 | |
| Ratio | 1.3d) | 3.0d) | 32d) | 1.1d) | ||
|
| ||||||
| Soybean leaves | Mining area | 8 | 1.01±0.45 | 18.9±3.00 | 2.41±0.39 | 163±46.4 |
| Control area | 3 | 0.24±0.05 | 10.5±1.81 | 1.55±0.15 | 54.9±20.9 | |
| Ratio | 4.2d) | 1.8d) | 1.6d) | 3.0d) | ||
|
| ||||||
| Spring onion | Mining area | 4 | 1.88±0.35 | 26.4±4.58 | 4.23±1.16 | 256±79.5 |
| Control area | 4 | 0.77±0.10 | 18.3±1.72 | 3.02±0.18 | 47.4±13.6 | |
| Ratio | 24d) | 1.4 | 1.4 | 5.3d) | ||
a)
Number of samples
b)
Mean ± standard deviation
c)
Calculated by mean concentrations in plants grown in the mining area divided by that in the control area
d)
Significant difference in mean concentrations in plants sampled between in the mining area and control area at p < 0.05