Table 1.
Statistic characteristics of HM concentrations and pH in the soil.
| pH | Cd (gm/kg) |
Hg (gm/kg) |
As (gm/kg) | Pb (gm/kg) |
Cr (gm/kg) |
Cu (gm/kg) |
Zn (gm/kg) |
Ni (gm/kg) |
Soil organic matter (g/kg) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Max | 8.46 | 6.25 | 2.35 | 1209.95 | 843.00 | 376.00 | 355.00 | 2455.00 | 161.00 | 188.66 |
| Mini | 4.54 | 0.11 | 0.02 | 2.23 | 5.58 | 75.50 | 12.10 | 47.00 | 10.00 | 8.79 |
| mean | 6.48 | 0.64 | 0.24 | 53.40 | 73.01 | 159.40 | 99.51 | 267.14 | 59.78 | 45.63 |
| CV | 0.14 | 1.05 | 1.26 | 2.29 | 1.66 | 0.30 | 0.56 | 1.34 | 0.40 | 0.62 |
| abackground value | – | 0.66 | 0.11 | 20.00 | 35.20 | 95.90 | 32.00 | 99.50 | 39.10 | |
| bRisk screening value (GB 15618-2018) | ≤5.50 | 0.30 | 1.30 | 40.00 | 70.00 | 150.00 | 50.00 | 200.00 | 60.00 | |
| 5.5–6.50 | 0.30 | 1.80 | 40.00 | 90.00 | 150.00 | 50.00 | 200.00 | 70.00 | ||
| 6.5–7.50 | 0.30 | 2.40 | 30.00 | 120.00 | 150.00 | 100.00 | 250.00 | 100.00 | ||
| >7.50 | 0.60 | 3.40 | 25.00 | 170.00 | 200.00 | 100.00 | 300.00 | 190.00 |
a
BV means background values of heavy metal (loid)s in the soil of Guizhou Province, which were obtained from CNEMC (1990) [45].
b
The National Environmental Quality Standards for soil in China (GB15618-2018).