Table 4 Elemental composition of solid fraction after steam explosion of untreated and preprocessed poplar biomasses
|  | Ba (µg/g) | Ca (µg/g) | Fe (µg/g) | K (µg/g) | Mg (µg/g) | Mn (µg/g) | Na (µg/g) | P (µg/g) | S (µg/g) | Zn (µg/g) | Si (µg/g) |
|---|---|---|---|---|---|---|---|---|---|---|---|
Untreated | 17.4 ± 0.3 | 2809 ± 263 | 24.0 ± 1.2 | 0.0 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 | 32.2 ± 2.6 | 0.0 ± 0.0 | 1865 ± 135 | 0.0 ± 0.0 | 46.5 ± 7.3 |
Neutral | 11.1 ± 0.1 | 1765 ± 64 | 19.6 ± 0.8 | 0.0 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 | 26.3 ± 0.3 | 0.0 ± 0.0 | 1326 ± 122 | 0.0 ± 0.0 | 33.7 ± 1.4 |
Acidic-neutral | 5.9 ± 0.2 | 1154 ± 23 | 24.6 ± 1.2 | 0.0 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 | 31.8 ± 0.5 | 0.0 ± 0.0 | 712 ± 33 | 0.0 ± 0.0 | 33.6 ± 2.2 |
Acidic | 7.1 ± 0.1 | 1244 ± 81 | 23.4 ± 1.9 | 0.0 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 | 30.4 ± 1.4 | 0.0 ± 0.0 | 772 ± 32 | 0.0 ± 0.0 | 46.3 ± 1.0 |