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

Table 3

¹H-NMR spectral data of 4-ASAUF terpolymer.

Nature of protons assigned	Expected chemical shift (δ) ppm	Observed chemical shift (δ) ppm of copolymer
1H, phenolic –OH (S)	3.5–9	4.7
1H, Ar–H (S)	6.5–9	7.5 and 8.1
2H, Ar–NH2 (S)	3.2–6	3.8
1H, Ar–COOH (S)	10–13	8.2
1H, CH2–NH–C=O (S)	5–8	7.1 and 7.2
2H, Ar–CH2–NH in Urea moiety (S)	2.5–3.5	3.9
2H, NH–CH2 (S)	1.5–3.5	2.70

S: stand for singlet.