Conference information: Abstracts, 15th Iranian Chemistry Congress

Abstract: During the last few decades aluminum and its distribution in the environment has been the subject of interest of many scientists. The concentrations of its dissolved species in most natural waters are below the μg L-1 level due to its relatively low solubility. A variety of analytical techniques including atomic absorption spectrometry [1], inductively coupled plasma-atomic emission spectrometry (ICP-AES) and spectrofluorimetry have been used for the determination of Al(III) in environmental samples [2]. However, trace determination of aluminum by these techniques required a separation/enrichment step prior to analysis. The widely used techniques for the separation and preconcentration of aluminum include liquid–liquid extraction [3], ion exchange [4], solid-phase extraction (SPE) [5] and cloud point extraction (CPE) [6]. In this study a new Al(III)-imprinted polymer (IIP) has been synthesized by using styrene and ethyleneglycoldimethacrylate (EGDMA) as a monomer and cross linker respectively, in the presence of Al(III)-8-hydroxyquinoline (oxine) complex. The imprinted Al(III) ions were completely removed by leaching the IIP with HCl (50% v/v) and characterized by FT-IR and SEM. The maximum sorption capacity for Al(III) ions was found to be 3.11 mg g-1 at pH 7.0. Variables affecting the IIP solid phase extraction were optimized by univariable methods. A sample volume of 400 mL resulted in preconcentration factor 194. Precision (n=7) at 125 μg L-1 level were 3.42. With preconcentration of 400 mL of sample detection limit of 1.6 μg L-1 was determined. The method was applied to the determination of aluminum in various samples. The accuracy was assessed through recovery experiments, independent analysis by furnace atomic absorption and analysis of certified references alloy and ore samples
Template and target information: aluminium ion, Al(III)

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