Characterization and Utilization of Tannin Extract for the Selective Adsorption of Ni (II) Ions from Water

Table 5

Analytical values of TGAN before and after Ni (II) adsorption.

Samples	BOD	COD	AAS (mg/L)
Before adsorption	90.78	245	0.57
After adsorption	3.25	9.05	0.29