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| Samples | C (wt%) | N (wt%) | O (wt%) | P (wt%) | Si (wt%) |
|---|---|---|---|---|---|
| EP-1 | 80.89 | 4.20 | 14.91 | 0 | 0 |
| EP-2 | 82.56 | 2.78 | 9.94 | 0 | 4.72 |
| EP-3 | 82.79 | 13.11 | 3.77 | 0.33 | 0 |
| EP-4 | 78.18 | 4.08 | 13.97 | 0.31 | 3.46 |
| EP-5 | 85.88 | 9.77 | 3.61 | 0.74 | 0 |
| EP-6 | 53.49 | 2.38 | 25.67 | 1.47 | 16.99 |
