Table 3.
TCLP leaching contents of heavy metals in MFS and its biochars.
| Samples | TCLP contents (mg/kg) |
|||||
|---|---|---|---|---|---|---|
| Zn | Cr | Pb | Ni | Cu | Cd | |
| MFS | 43.61 ± 0.62 | 15.31 ± 0.33 | 3.93 ± 0.07 | 6.54 ± 0.21 | 2.58 ± 0.02 | 0.12 ± 0.01 |
| MC500 | 60.95 ± 0.26 | 14.19 ± 0.04 | 2.98 ± 0.07 | 4.98 ± 0.03 | 1.00 ± 0.01 | 0.15 ± 0.02 |
| MC600 | 52.29 ± 0.96 | 10.89 ± 0.19 | 2.90 ± 0.03 | 2.41 ± 0.01 | 0.65 ± 0.02 | 0.11 ± 0.02 |
| MC700 | 45.43 ± 0.38 | 9.48 ± 0.20 | 1.62 ± 0.02 | 1.06 ± 0.02 | 0.53 ± 0.01 | 0.06 ± 0.01 |
| MC800 | 17.40 ± 0.13 | 5.81 ± 0.02 | 1.04 ± 0.02 | 1.09 ± 0.02 | 0.48 ± 0.02 | ND |
| MC900 | 3.49 ± 0.16 | 4.93 ± 0.13 | 0.14 ± 0.01 | 0.89 ± 0.02 | 0.14 ± 0.00 | ND |
| Threshold valuesa | 5 | 5 | 5 | 5 | 5 | 1 |
a
From (EPA US, 1990).