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Solid Phase Extraction Of Trace Amounts Cu, Fe And Pb As Bis(2-Hydroxyphenylamino) Glyoxime Complexes On Naphthalene Adsorbent And Flame Atomic Absorption Determination

Mansour Jahangiri, Ali Moghimi

A simultaneous preconcentration method was developed for determination of trace amounts of Cu, Fe and Pb by atomic absorption spectrometry. The method is based on the retention of their bis(2-hydroxy phenyl amino)glyoxime(oxime I) complexes by naphthalene methyltrioctyl ammonium chloride adsorbent in a column. The adsorbed metal complexes were eluted from the column with nitric acid and Cu, Fe and Pb were determined by flame atomic absorption spectrometry. Several parameters such as pH of the sample solution, ligand concentration, volume of the sample and the amount of methyltrioctyl ammonium chloride loaded on naphthalene were evaluated. The effect of diverse ions on the preconcentration was also investigated. A preconcentration factor of up to 100 or more can easily be achieved depending on the volume of the sample taken. The calibration graphs were obtained in the range of 5-40, 10-100 and 10-200ng ml-1 for Cu, Fe and Pb in the initial solution, respectively, when using 500ml of the solution. The detection limit based on three standard deviations of the blank was 2.2, 3.1, and 4.2ng ml-1 for Cu, Fe and Pb, respectively. The relative standard deviations (R.S.D.) of 1.1-2.7% for Cu, 2.2-3.6% for Fe and 12- 2.9% for Pb were obtained. The method was applied to the determination of Cu, Fe and Pb in river and wastewater samples.