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Preconcentration and Determination of Cd(II) Using Octadecyl Silica Membrane Disks modified Cyanex 272 and Flame Atomic Absorption Spectrometry

Ali Moghimi

A novel and selective method for the fast determination of trace amounts of Cd(II)in water samples has been developed. The procedure is based on the selective formation of Cd(II) bis(2,4,4-trimethylpentyl)phosphinic complexes at different pH in the presence of acetate as an enhancement agent of Cd(II) signals followed by elution with organic eluents and determination by atomic absorption spectrometry. The maximum capacity of the employed disks was found to be 4713g for Cd(II). The detection limit of the proposed method is 105ng.L-1 for Cd(II). The effect of potential interfering ions, 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 500. The proposed method was successfully applied for determination of Cd(II) in different water samples.