Table 3.
Micro elemental analysis of the samples.
| Chemical Element |
BO | CA-24 | CA-BO2.5 | CA-BO5.0 | CA-BO7.5 | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Content (%) | σ | Content (%) | σ | Content (%) | σ | Content (%) | σ | Content (%) | σ | |
| Carbon (C) | 70.51 | 3.09 | 92.60 | 3.93 | 91.39 | 3.13 | 86.54 | 8.39 | 87.03 | 5.10 |
| Sulfur (S) | - | - | 3.80 | 0.15 | 3.36 | 0.26 | 3.08 | 1.60 | 3.58 | 0.64 |
| Oxygen (O) | 22.72 | 0.48 | 2.92 | 1.69 | 3.82 | 2.95 | 8.24 | 6.73 | 5.16 | 4.01 |
| Calcium (Ca) | 1.38 | 0.29 | - | - | 0.67 | 0.39 | - | - | - | - |
| Nitrogen (N) | - | - | 7.87 | 4.54 | - | - | 4.31 | 2.49 | 7.35 | 4.24 |
| Silicon (Si) | 3.29 | 3.25 | - | - | - | - | 1.62 | 0.96 | - | - |
| Potassium (K) | 1.89 | 0.53 | - | - | - | - | - | - | 3.51 | 2.03 |
| Phosphorus (P) | 0.61 | 0.35 | - | - | - | - | - | - | 1.22 | 0.70 |
Note: σ: standard deviation.