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| Sample | Alkali metal | Content of alkali metal | |
|---|---|---|---|
| mg g−1 | mmol g−1 | ||
| TIG-5 mL-LiOH | Li | 58.2 | 8.36 |
| TIG-15 mL-NaOH | 127.5 | 18.35 | |
| TIG-5 mL-NaOH | Na | 134.1 | 5.61 |
| TIG-15 mL-NaOH | 179.3 | 7.54 | |
| TIG-5 mL-KOH | K | 136.6 | 3.42 |
| TIG-15 mL-KOH | 151.8 | 3.89 | |
