Amberlite XAD-7 resin impregnated with 2-(1-(4-chlorophenyl)-4,5-diphenyl-1H-imidazol-2yl)-4-nitrophenol for enrichment of metal ions

The Amberlite XAD-7 resin modification was carried out by loading 2-(1-(4-chlorophenyl)-4,5-diphenyl-1H-imidazol-2yl)-4-nitrophenol (CPDPINP). Subsequently, this new sorbent was applied for the enrichment of metal ions such as Cu2+, Ni2+, Co2+ Zn2+ and Pb2+ ions. The effect of various parameters on their sorption and following recoveries was studied in column procedure. The preconcentrated ions were eluted by appropriate eluent and their contents were quantified by FAAS. This method has preconcentration factor of 150 and enrichment factor in the range of 20.8–29.1. At optimum values of all variables, the proposed method has linear calibration graphs in the range of 0.01 up to 0.29 μg mL−1 with detection limit (3SDb/m, n = 15) between 1.6 and 2.6 ng mL−1. This protocol is usable for successful analysis of Cu2+, Ni2+, Co2+ Zn2+ and Pb2+ ions in different matrices with reasonable recoveries (>93%) and acceptable relative standard deviation (<4.7%).