Table 3 OBDC content and reference value.
Heavy metal | Content value mg/kg | Background value, China mg/kg | Agricultural land standards mg/kg |
|---|---|---|---|
Cr | 62.3 | 79.0 | 200.0 |
Cu | 38.7 | 31.1 | 100.0 |
Pb | 65.9 | 30.9 | 120.0 |
Zn | 154.9 | 86.5 | 250.0 |
Mn | 240.4 | 657.0 | NA |
Ni | 61.1 | 32.6 | 100.0 |
Hg | 1.3 | 0.2 | 15.0 |
