Element content (%) | Mean value ± SD |
Carbon (C) | 39.4 ± 1.6 |
Oxygen (O) | 48.46 ± 3.10 |
Calcium (Ca) | 4.85 ± 0.13 |
Potassium (K) | 3.84 ± 1.22 |
Magnesium (Mg) | 0.88 ± 0.05 |
Sulfur (S) | 0.27 ± 0.03 |
Phosphorus (P) | 0.22 ± 0.03 |