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Schiff base-functionalised styrofoam resin for preconcentration of metal ions in wastewater and wastewater-irrigated vegetables samples

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Polystyrene (PS) was extracted from styrofoam waste and functionalised with schiff base, N,N-bis(salicylidene)cyclohexanediamine (SCHD) through an azo spacer. The resin was characterised and used for preconcentration of Pb(II), Ni(II) and Cd(II) ions prior to their trace determinations by microsample injection system–coupled flame atomic absorption spectrometry (MIS-FAAS). The recoveries of studied metal ions were achieved ≥96.0% with relative standard deviation (RSD) ≤4.5 at optimum parameters: pH 8; resin amount 300 mg; flow rates 3.0 mL min−1 of sample solution; and 2.0 mL min−1 of eluent (2.0 mol L−1 HNO3). The limits of detection (LODs) and limits of quantification (LOQs) were found to be 0.32, 0.23 and 0.21 and 1.10, 0.78 and 0.69 μg L−1, respectively, with preconcentration factors (PFs) of 500, 800 and 1000, respectively. The linear ranges of the method were 1–40, 1–25 and 1–20 μg L−1 for Pb(II), Ni(II) and Cd(II) ions, respectively. The accuracy and validation of the method were evaluated by analysis of certified reference materials (CRMs). The method was successfully applied for preconcentration of studied metal ions in wastewater and wastewater-irrigated vegetable samples.
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Keywords: MIS-FAAS; chelating resin; preconcentration; solid-phase extraction; styrofoam foam waste; vegetables; wastewater irrigation

Document Type: Research Article

Affiliations: 1: Chemistry Department, Faculty of Science and Art, Pamukkale University, Denizli, 20017, Turkey 2: Dr. M. A. Kazi Institute of Chemistry, Faculty of Natural Science, University of Sindh, Jamshoro, 76080, Pakistan 3: Department of Chemistry, Faculty of Sciences, University of Ege, Bornova, 35040, Turkey

Publication date: December 8, 2014

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