Abstract
The authors describe double-shell magnetic nanoparticles functionalized with 2-mercaptobenzothiazole (MBT) to give nanospheres of the type MBT-Fe3O4@SiO2@C). These are shown to be viable and acid-resistant adsorbents for magnetic separation of the heavy metal ions Ni(II), Cu(II) and Pb(II). MBT act as a binding reagent, and the carbon shell and the silica shell protect the magnetic core. Following 12 min incubation, the loaded nanospheres are magnetically separated, the ions are eluted with 2 M nitric acid and then determined by inductively coupled plasma-mass spectroscopy. The limits of detection of this method are 2, 82 and 103 ng L‾1 for Ni(II), Cu(II), and Pb(II) ions, respectively, and the relative standard deviations (for n = 7) are 6, 7.8, and 7.4 %. The protocol is successfully applied to the quantitation of these ions in tap water and food samples (mint, cabbage, potato, peas). Recoveries from spiked water samples ranged from 97 to 100 %.
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Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type Fe3O4@SiO2@C were synthesized. Then applied for magnetic solid phase extraction of Ni(II), Cu(II) and Pb(II) from water and food samples with LOD of 0.002, 0.082 and 0.103 μg L−1 respectively.
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The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding this work through Research Group No. RG–1435–002.
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Habila, M.A., ALOthman, Z.A., El-Toni, A.M. et al. Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type Fe3O4@SiO2@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS. Microchim Acta 183, 2377–2384 (2016). https://doi.org/10.1007/s00604-016-1880-x
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DOI: https://doi.org/10.1007/s00604-016-1880-x