Abstract
In this work, a method for on-line preconcentration and determination of zinc was developed. A miniglass column (35 × 3 mm) containing 70 mg of Dowex 1X8 resin modified with 1% (w/w) of zincon was coupled into the FI-FAAS system. During the extraction procedure, it was verified that the metal reacts with the complexing reagent in the pH range from 9.0 to 10.0. After optimization of parameters such as type and concentration of the eluent, buffer concentration, elution time, sample and buffer flow rate, mixing coil length, and effect of foreign ions, the FI-FAAS system presented an enrichment factor of 10 and at least 200 reutilizations of the column were possible. The detection limit was 0.67 μg L−1, and a relative standard deviation of 5% was obtained. The accuracy of the method was evaluated by using certified reference material, showing good accuracy. The proposed method was successfully applied for the determination of zinc in beverages.
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