Removal of Toxic Metal Ions from Water Using Chelating Terpolymer Resin as a Function of Different Concentration Time and pH

Table 5

Comparison of the rates of metal (M) ions^a uptake by 4-ASAUF terpolymer resin.

Metal ion	pH	Percentage of metal ion uptake^b at different times (h)
		1	2	3	4	5	6	7
Fe^3+	2.5	46	72	97	—	—	—	—
Cu^2+	4.5	12	32	46.5	62.5	93	—	—
Hg^2+	4.5	16	29	44	62	85	—	—
Cd^2+	5	13	22.5	35.5	56	76	95	—
Co^2+	5	14	32.5	47	71.5	87	—	—
Zn^2+	5	4.5	27	42	62	71	—	—
Ni^2+	5	5	19.5	42	71.5	88	—	—
Pb^2+	6	6	18.5	38.5	72	77.5	89	—

a[M(NO₃)₂] = 0.1 mol/L; volume = 2 mL; NaNO₃ = 1.0 mol/L; and volume = 25 mL, room temperature.
^bMetal ion uptake = (amount of metal ion absorbed × 100)/amount of metal ion absorbed at equilibrium.