Table 2. Elemental analysis (μg l−1) from water samples (n = 3) in each treatment (mean ± s.e.m.).
| Element | Leach test (μg l−1) from each coal treatment |
||||
|---|---|---|---|---|---|
| Control (0 mg l−1) | Low (38 mg l−1) | Moderate (73 mg l−1) | Medium (202 mg l−1) | High (275 mg l−1) | |
| Arsenic (As) | 1.2 ± 0.1 | 1.4 ± 0.1 | 1.5 ± 0.1* | 1.4 ± 0.1 | 1.4 ± 0.0 |
| Cadmium (Cd) | 0.1 ± 0.0 | 0.1 ± 0.0 | 0.1 ± 0.0 | 0.0 ± 0.0 | 0.1 ± 0.0 |
| Cobalt (Co) | 0.0 ± 0.0 | 0.1 ± 0.0* | 0.1 ± 0.0* | 0.2 ± 0.0* | 0.1 ± 0.0* |
| Copper (Cu) | 0.3 ± 0.1 | 0.5 ± 0.1 | 0.5 ± 0.1 | 0.5 ± 0.1 | 0.5 ± 0.3 |
| Lead (Pb) | 0.0 ± 0.0 | 0.1 ± 0.0 | 0.1 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 |
| Manganese (Mn) | 0.3 ± 0.1 | 0.3 ± 0.1 | 0.4 ± 0.1 | 0.6 ± 0.1 | 0.6 ± 0.2 |
| Molybdenum (Mo) | 11.3 ± 0.2 | 11.0 ± 0.5 | 11.4 ± 0.5 | 12.0 ± 0.2 | 12.1 ± 0.1 |
| Nickel (Ni) | 0.5 ± 0.1 | 1.1 ± 0.2 | 1.8 ± 0.4 | 2.9 ± 0.8* | 2.6 ± 0.5 |
| Zinc (Zn) | 2.1±0.7 | 2.9 ± 1.1 | 3.0 ± 0.9 | 2.5 ± 0.3 | 2.9 ± 0.8 |
Coal treatments where levels were significantly different from the control treatment (ANOVA, one-way analysis of variance) are depicted with a*.