Publicação: Determination of cadmium in river water samples by flame AAS after on-line preconcentration in mini-column packed with 2-aminothiazole-modified silica gel
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A rapid and sensitive method was developed to determine trace levels of Cd2+ ions in an aqueous medium by flame atomic absorption spectrometry, using on-line preconcentration in a mini-column packed with 100 mg of 2-aminothiazol modified silica gel (SiAT). The Cd2+ ions were sorbed at pH 5.0. The preconcentrated Cd2+ ions were directly eluted from the column to the spectrometer's nebulizer-burner system using 100 μL of 2 mol L-1 hydrochloric acid. A retention efficiency of over 95% was achieved. The enrichment factor (calculated as the ratio of slopes of the calibration graphs) obtained with preconcentrations in a mini-column packed with SiAT (A = -1.3 × 10-3 + 1.8 × 10-3 [Cd2+]) and without preconcentrations (A = 4 × 10-5 + 3.5 × 10-3[Cd2+]), was 51 and the detection limit calculated was 0.38 μg L-1. The preconcentration procedure was applied to determine trace levels of Cd in river water samples. The optimum preconcentration conditions are discussed herein.
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2 aminothiazole derivative, cadmium, hydrochloric acid, river water, silica gel, adsorption, aqueous solution, atomic absorption spectrometry, calibration, combustion, concentration (parameters), elution, flame atomic absorption spectrometry, nebulizer, online system, pH, sensitivity and specificity, water sampling, Cadmium, Calibration, Hydrochloric Acid, Hydrogen-Ion Concentration, Ions, Models, Chemical, Silicon Dioxide, Spectrophotometry, Spectrophotometry, Atomic, Spectrophotometry, Infrared, Thiazoles, Time Factors, Water
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Analytical Sciences, v. 20, n. 7, p. 1029-1032, 2004.
