Research Article
Leaching of Fluoride from Biotite Mica in Soil: Implications for Fluoride in Shallow Groundwater
Table 4
Leachable ionic concentrations of treated highly weathered biotite: after one month and six months.
| Ions | Medium | Citric acid | Nitric acid | Distilled water | 1st month | 6th month | 1st month | 6th month | 1st month | 6th month |
| Fā | 1980 | 9000 | 2700 | 5750 | 300 | 3150 | K+ | 1091 | 1216 | 1277 | 390 | 68 | 65 | Fe2+ | 2008 | 5320 | 1031 | 1262 | 9 | 29 | Mg2+ | 170 | 613 | 225 | 369 | 75 | 73 | Na+ | 157 | 295 | 181 | 274 | 132 | 213 |
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