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Chelating Resin Based on Silica Gel for Solid-Phase Extraction Coupled with Flame
Atomic Absorption Spectrometric Determination of Nickel and Cadmium

Chelating resins offer a fast, accurate and simple method for separation and preconcentration of metal
ions at low concentrations prior to their determination by an instrumental method. Silica gel-based
chelating resin with chemically immobilized aurintricarboxylic acid was synthesized, characterized
and used to determine Ni(II) and Cd(II) at trace levels, coupled with their analysis by flame atomic
absorption spectrometer. The resin had sorption capacities of 0.21 mmol g-1 and 0.10 mmol g-1 for
Ni(II) and Cd(II), respectively. The analytical detection limit (N = 20) was 1.70 μg L-1 for Ni(II) and
1.90 μg L-1 for Cd(II). The proposed method was useful for the quantitative determination of Ni(II)
and Cd(II) in some commercial and water samples.