Defluoridation with Locally Produced Thai Bone Char

Table 6

Ion concentrations in the groundwater samples.

Number	Concentration (mg/L)
	F^−	Cl^−
Site 1	16.27	20.20	0.95	22.60	<0.1
Site 2	13.60	32.40	0.77	25.80	<0.1
Site 3	18.77	50.10	2.20	215.00	0.43
Site 4	10.57	68.90	1.20	184.00	<0.1
Site 5	13.80	59.50	1.40	194.00	<0.1
Site 6	10.93	127.00	3.30	3.63	<0.1
Syn.	3.9	—	—	—	—