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Preconcentration and determination of copper(II) using octadecyl silica membrane disksmodified by 1,2-bis (salicylideneamino) ethane and flame atomic absorption spectrometry

Ali Moghimi

A simple and reproducible method for the rapid extraction and determination of trace amounts of copper(II) ions using octadecyl-bonded silica membrane disks modified by 1,2- bis(salicylideneamino)ethane (SALET) and atomic absorption spectrometry is presented. The method is based on complex formation on the surface of the ENVI-18 DISKTM disks followed by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution is efficient and quantitative. The effect of potential interfering ions, pH, ligand amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break-through volume was found to about 1000mL providing a preconcentration factor of 400. Themaximumcapacity of the diskswas found to be 465± 5 µg for Cu2+.The limit of detection of the proposed method is 7ng per 1000mL.The method was applied to the extraction and recovery of copper in different water samples.