Table 2 Chemical properties and heavy metal concentration of coal mine waste and coal ash
From: In situ reclamation of closed coal mine waste in Korea using coal ash
Chemical properties | Coal mine waste | Coal ash |
|---|---|---|
pH (1:5) | 3.1 ± 0.05 | 10.6 ± 0.36 |
Organic matter (g kg−1) | 1.6 ± 0.06 | 5.9 ± 0.062 |
Avail P2O5 (mg kg−1) | 4.2 ± 0.78 | 241.3 ± 16. |
CEC (cmol(+) kg−1) | 12.86 ± 0.06 | 21.9 ± 0.13 |
Heavy metal concentration (aqua regia, mg kg−1) | ||
As | 217 ± 15.8 | 13.3 ± 0.39 |
Cd | 1.66 ± 0.12 | 0.21 ± 0.01 |
Cu | 4.83 ± 0.43 | 24.8 ± 0.48 |
Pb | 83.8 ± 8.18 | 18.3 ± 0.19 |
Zn | 24.3 ± 3.05 | 140 ± 1.09 |
Ni | 12.5 ± 0.57 | 20.9 ± 0.06 |