Table 2 Heavy metal concentrations in the edible part of lettuce of different treatments (S: control; SB: soil amended with B38; SC: soil amended with corn straw-derived biochar; SCB: soil amended with corn straw-derived biochar and B38; SP: soil amended with pig manure-derived biochar; SPB: soil amended with pig manure-derived biochar and B38) (n = 3).
heavy metal | Cd | Cr | Hg | Pb | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
concentration(mg kg−1) | reduction (%) | Limita(mg kg−1) | concentration(mg kg−1) | reduction (%) | Limita(mg kg−1) | concentration(mg kg−1) | reduction (%) | Limita(mg kg−1) | concentration(mg kg−1) | reduction (%) | Limit a(mg kg−1) | |
S | 0.52 ± 0.03 | — | 0.2 | 4.42 ± 0.05 | — | 0.5 | 0.79 ± 0.02 | — | 0.01 | 5.33 ± 0.04 | — | 0.3 |
SB | 0.40 ± 0.01 | 23.08 | 3.75 ± 0.07 | 15.16 | 0.40 ± 0.02 | 49.37 | 4.14 ± 0.22 | 22.33 | ||||
SC | 0.32 ± 0.02 | 37.96 | 3.18 ± 0.11 | 27.82 | 0.59 ± 0.01 | 25.96 | 0.89 ± 0.03 | 83.26 | ||||
SCB | 0.16 ± 0.01 | 68.64 | 2.62 ± 0.15 | 40.69 | 0.41 ± 0.03 | 48.94 | 0.33 ± 0.01 | 93.73 | ||||
SP | 0.17 ± 0.04 | 67.39 | 2.25 ± 0.41 | 49.04 | 0.34 ± 0.01 | 57.68 | 0.27 ± 0.03 | 94.90 | ||||
SPB | 0.06 ± 0.01 | 87.65 | 1.33 ± 0.01 | 69.95 | 0.15 ± 0.02 | 80.66 | 0.21 ± 0.01 | 96.06 | ||||
