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Elemental composition of rice husk biochar from EDS.
| Samples of biochar prepared at | Elements composition (%wt) | |||||
|---|---|---|---|---|---|---|
| C | O | Si | K | P | Ca | |
| 400°C | 74.62 | 22.02 | 2.94 | 0.42 | — | — |
| 500°C | 77.44 | 16.54 | 5.39 | 0.63 | — | — |
| 600°C | 78.41 | 13.71 | 6.95 | 0.92 | — | — |
| After use | 62.20 | 18.90 | 16.92 | — | 1.11 | 0.86 |
