Table 4. Solution pH, Total Organic Carbon (TOC), and Metal Ion Concentration of the Collected Samples before and after Adsorption.

	sample 1		sample 2
parameter	before adsorption	after adsorption	before adsorption	after adsorption
pH	7.62	8.05	7.76	8.14
TOC (mg/L)	5.30	4.88	5.62	4.30
K+ (mg/L)	6.74	6.35	6.83	6.16
Na+ (mg/L)	47.1	37.2	45.7	39.4
Ca2+ (mg/L)	43.5	43.1	39.1	38.9
Mg2+ (mg/L)	10.0	9.97	9.68	9.54
Fe3+ (mg/L)	0.02	0	0.03	0
Cu2+ (mg/L)	0	0	0	0
Al3+ (mg/L)	0.30	0.25	0.29	0.28