An analytical method using silica gel chemically modified with 2-aminothiophenol for preconcentration of Cadmium, in a column system, and their sequential determination by flame atomic absorption spectrometry (FAAS), was developed. In this work, Cadmium was adsorbed onto silica gel chemically modified with 2-aminothiophenol and then was recovered by nitric acid. Solutions of cadmium were passed through a glass column packed with 100 mg of the sorbent material, at pH 5.0, and Cadmium was eluted with 2.0 M HNO3 at a flow rate of 2.0 ml min-1. The relative standard deviation (RSD) for eight replicate determinations at the 2.5 μg of Cadmium was ±0.94%. The calibration curve using the preconcentration system was linear from 0.01 to 4 μg mL-1 in final solution with a correlation coefficient of 0.9993. This method was successfully applied for determination of Cadmium in various samples.

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