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Fluoride levels in clay soil samples activated at different contact times.
| Samples | Mechanochemically Activated Time (min) | Fluoride Level (mg/L) | Fluoride Level (mg/g) |
|---|---|---|---|
| A | 5 | 0.0401 | 2.0 × 10−3 |
| B | 10 | 0.0610 | 3.05 × 10−3 |
| C | 20 | 0.0605 | 3.02 × 10−3 |
| D | 30 | 0.0638 | 3.19 × 10−3 |
| E | 40 | 0.0638 | 3.19 × 10−3 |
| F | 60 | 0.0703 | 3.51 × 10−3 |
