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

Table 5

Pearson correlation matrix for biotite treated with acids and distilled water.

Medium		F^−	K^+	Fe^2+	Na^+	Mg^2+
Citric	F^−	1
	K^+	0.414	1
	Fe^2+	0.544	0.565	1
	Na^+	0.580	0.009	0.352	1
	Mg^2+	0.777	0.530	0.582	0.460	1
HNO3	F^−	1
	K^+	−0.222	1
	Fe^2+	−0.478	0.584	1
	Na^+	0.294	−0.260	−0.536	1
	Mg^2+	−0.221	−0.146	0.033	0.137	1
Water	F^−	1
	K^+	0.259	1
	Fe^2+	0.043	−0.054	1
	Na^+	0.538	−0.145	0.104	1
	Mg^2+	0.042	−0.214	−0.027	0.157	1