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Abstract
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In this study, a magnetic metal-organic framework (MOF) was synthesized based on magnetic Fe3O4, Cu(II), and benzene-1,3,5- tricarboxylic acid (Cu-BTC) as a sorbent for solid phase extraction (SPE) of trace amounts of Pb(II) in water and lettuce samples. Pb(II) ion was adsorbed on the magnetic MOF and easily separated by a magnet; therefore, no +ltration or centrifugation was necessary. ,e analyte ions were eluted by HCl 0.5 mol·L−1 and analyzed via graphite furnace atomic absorption spectroscopy. ,e prepared sorbent was characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and Fourier transform-infrared (FT-IR) spectroscopy. Under optimal experimental conditions, the method had a linear range of 0.1–50 %g·L−1. ,e limits of detection and quantitation for lead were found to be 0.026 and 0.08 %g·L−1, respectively. ,e results showed that the prepared sorbent has high selectivity for Pb2+ even in the presence of other interfering metal ions.
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