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Acta Chim. Slov. 2010, 57, 222–229 Scientific paper
Amberlite XAD-4 Impregnated With a New Pentadentate Schiff base: a Chelating Collector for Separation and Preconcentration of Trace Amounts of Gallium (III) and Indium (III)
Kamal Saberyan,1,* Ehsan Zolfonoun,1 Mojtaba Shamsipur2 and Masoud Salavati-Niasari3
1
Chemistry Research Department, Nuclear Science Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran
2 3
Department of Chemistry, Razi University, Kermanshah, Iran
Department of Chemistry, Faculty of Science, University of Kashan, Kashan, Iran * Corresponding author: E-mail: ksaberyan@mail.nrcam.org Tel.: +98 261 4411100; Fax: +98 261 4464056
Received: 16-08-2009
Abstract
A new solid-phase extraction method for separation and preconcentration of trace amounts of Ga(III) and In(III) in biological and water samples is proposed. The procedure is based on the adsorption of Ga(III) and In(III) ions on a column of Amberlite XAD-4 resin loaded with newly-synthesized pentadentate naphthol-derivative Schiff base 1-{[(6-{[(E)-1(2-hydroxy-1-naphthyl)methylidene]amino}-2-pyridyl)imino]methyl}-2-naphthol (HMPN) prior to their determination by flame atomic absorption spectrometry (FAAS). The optimum pH values for quantitative sorption of Ga(III) and In(III) are 4.5–6.0 and 4.5–8.0, respectively, and their desorptions can be achieved by using 5 mL of 0.5 M HNO3. The sorption capacities of the resin for Ga(III) and In(III) were 1.27 and 1.45 mg g–1, respectively. The enrichment factor for preconcentration of Ga(III) and In(III) was found to be 200. The precision of the method, evaluated as the relative standard deviation obtained by analyzing a series of ten replicates, was below 3% for both elements. The proposed procedure was applied to the analysis of synthetic seawater, natural waters, wastewater and human blood serum using flame AAS. Keywords: Solid phase extraction; Amberlite XAD-4; gallium(III); indium(III); Schiff base

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