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

Table 6

Distribution ratio D^a of various metal ions^b as function of the pH by 4-ASAUF terpolymer resin.

Metal ion	pH	Distribution ratio of metal ion at different pH
		1.5	2	2.5	3	3.5	4	5	6	6.5
Fe^3+	2.5	62.35	98.50	188.55	398.0	—	—	—	—	—
Cu^2+	4.5	—	—	42.50	45.75	50.38	85.54	148.26	620.30	1026.32
Hg^2+	4.5	—	—	28.37	71.36	82.54	296.77	352.68	389.45	542.34
Cd^2+	5	—	—	142.24	155.42	211.21	266.42	333.84	441.45	616.42
Co^2+	5	—	—	22.22	31.32	54.33	69.79	116.45	242.23	322.88
Zn^2+	5	—	—	22.30	38.82	47.80	73.74	122.70	236.63	292.75
Ni^2+	5	—	—	0.68	17.83	52.33	109.42	266.42	548.36	1025.3
Pb^2+	6	—	—	13.65	21.40	27.16	36.26	55.16	124.70	232.42

aD = weight (in mg) of metal ions taken up by 1 g of terpolymer/weight (in mg) of metal ions present in 1 mL of solution.
^b[M(NO₃)₂] = 0.1 mol/L; volume = 2 ml; NaNO₃ = 1.0 mol/L; and volume = 25 mL, time 24 h (equilibrium state) at room temperature.