Analytical Sciences

Determination by AAS of Some Trace Heavy Metal Ions in SomeNatural and Biological Samples after Their PreconcentrationUsing Newly Chemically Modified ChloromethylatedPolystyrene-PAN Ion-Exchanger

I. M. M. KENAWY, Ž€Û®. A. H. HAFEZ, M. A. AKL, and R. R. LASHEIN

Department of Chemistry, Faculty of Science, University of Mansoura, 35516, Mansoura, Egypt

The use of chemically modified chloromethylated polystyrene-PAN, CMPS-PAN ion-exchanger for the separation ofAu(III), Cd(II), Co(II), Cr(III), Cu(II), Fe(III), Mn(II), Ni(II), Pb(II), Pd(II) and Zn(II) from aqueous solution is described.After preconcentration, the heavy cations under investigation were determined using atomic absorption spectrometry(AAS). The distribution coefficient, K_d and the percentage concentration of the studied metal ions on the ion-exchangerat equilibrium, C_M,eqm, % are evaluated as a function of pH, mass of ion-exchanger and shaking time. The calculated K_dvalues for the investigated cations are in the range of 25 - 7.9 qÛ’0⁵ cm³ g^-1. The interfering effects of different foreignions were studied. The chelates formed between CMPS-PAN ion-exchanger and the investigated metal ions werecharacterized by FT-IR spectrometry, potentiometry and thermal analysis. The present method is simple and rapidlyapplicable for the microdetermination of eleven heavy metal ions at ppb levels. Analytical applications for thepreconcentration and separation using the modified CMPS-PAN ion-exchanger and the determination of the studied metalions in tap, Nile, waste and sea water samples, human urine, milk (synthetic and natural) and some ores were carried out.

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