Development of an Efficient Procedure for Determination of Copper, Zinc and Iron after Solid Phase Extraction on 3-(1-(1-H-Indol-3-yl)-3-phenylallyl)-1H-indole Loaded on Duolite XAD 761

A method for the simultaneous preconcentration of Cu(2+), Zn(2+) and Fe(3+) ions, in some food samples has been reported. The method is based on the adsorption of 3-(1-(1-H-indol-3-yl)-3-phenylallyl)-1H-indole (IPA I) loaded on Duolite XAD 761 The metal ions adsorbed on the modified solid phase resin are eluted using 6 mL of 4 mol L(-1) nitric acid. The influences of the analytical parameters including pH and amount of ligand and solid phase and type and amount of surfactant and sample volume on the metal ions recoveries were investigated The effects of matrix ions on the retentions of the analytes were also examined. The recoveries of analytes were generally higher than 95% with a RSD lower than 5%. The method has been successfully applied for these metals content evaluation in some real sample