Determination and preconcentration of trace amounts of Cd(II), Cu(II), Ni(II), Zn(II), and Pb(II) ions by functionalized magnetic nanosorbent and optimization using a Box-Behnken design and detection of them by a flame atomic absorption spectrometer

Document Type: Article

Authors

1 Department of Chemistry, Semnan University, Semnan 35131-1911, Iran

2 Department of Environmental Science, Islamic Azad University of Ardabil Branch, Ardabil, Iran

Abstract

In this work Fe3O4@SiO2 core-shell nanoparticles functionalized with 2-mercaptobenzothiazole as a magnetic nanosorbent was utilized for the simultaneous extraction of trace amounts of cadmium(II), copper(II), nickel(II), zinc(II) and lead(II) ions. A Box–Behnken design was applied with several variables for optimization of the extraction and elution steps. In the selected conditions, it was observed that limits of detection were 0.14 ng mL−1 for Cd(II), 0.24 ng mL−1 for Cu(II), 0.30 ng mL−1 for Ni(II), 0.27 ng mL−1 for Zn(II) and 0.53 ng mL−1 for Pb(II) and the maximum sorption capacity of this suggested magnetic nanosorbent was 168, 138, 104,  120, and 220 mg g−1 for Cd(II), Cu(II), Ni(II), Zn(II) and Pb(II), respectively. Finally, the suggested procedure was applied for determination of target metal ions at trace levels in different water samples, sugar, edible salts and various vegetables (lettuce, broccoli, and tomato) samples with satisfactory results.   

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