Leaching of Fluoride from Biotite Mica in Soil: Implications for Fluoride in Shallow Groundwater

Table 3

Leachable ionic concentrations of treated fresh 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
F^−	1980	9000	450	2900	150	2600
K^+	1677	4521	2634	4236	378	460
Fe^2+	1000	5215	2007	2400	27	71
Mg^2+	239	756	276	346	53	36
Na^+	130	230	130	271	63	98