New Anion-Exchange Solid-Phase Extraction Support Used for Preconcentration and Determination of Lead in Water Samples by Flame Atomic Absorption Spectrometry

Abstract

A new chelating resin was prepared by coupling Amberlite XAD-2 with Brilliant Green through an azo spacer. The resulting resin has been characterized by FTIR spectrometry, elemental analysis, and thermogravimetric analysis and studied for the preconcentration and determination of trace Pb(II) ions from solution samples. The anionic complex of Pb(II) and iodide was retained on the resin by the formation of an ion associate with Brilliant Green on Amberlite XAD-2 in weak acidic medium. The optimum pH value for sorption of the metal ion was 5.5. The sorption capacity of the functionalized resin is 53.8 mg/g. The chelating resin can be reused for 20 cycles of sorptiondesorption without any significant change in sorption capacity. A recovery of 103% was obtained for the metal ion with 0.1 M EDTA as the eluting agent. Scatchard analysis revealed that the homogeneous binding sites were formed in the polymers. The resin was subjected to evaluation through batch binding and column chromatography of Pb(II). The equilibrium adsorption data of Pb(II) on modified resin were analyzed by Langmuir, Freundlich, and Temkin models. Based on equilibrium adsorption data, the Langmuir, Freundlich, and Temkin constants were determined to be 0.192, 13.189, and 3.418 at pH 5.5 and 25C. The method was applied for lead ion determination in tap water samples.

Chemical Modification and Characterization of Yeast Cells for Extraction of Metal Ion in Water Sample

“…In order to low concentration of these elements in the samples, mentioned techniques can't be applied directly, therefore several preconcentration methods are developed. There are numerous systems of preconcentration such as liquid-liquid extraction [2], coprecipitation [3], , cloud point extraction [4] membrane filter techniques [5] and ion exchange techniques [6 ]. Several solid phase extrction have been reported in solid phase extraction by organic [7] and inorganic [8] polymers, modified activated carbon [9,10 ], nanocomposits [11 ], biomaterial [12] and biocompatible material for instance.…”