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• W2215243418 abstract "ABSTRACTFe3O4 nanoparticles coated with SiO2 and modified with ammonium pyrrolidine dithiocarbamate as a new adsorbent for the single-step extraction and preconcentration of trace amounts of copper and nickel from tobacco samples were prepared. The particle sizes of nanoparticles were characterised by transmission electron microscope. Several parameters affecting the analytical performance, such as the amount of ammonium pyrrolidine dithiocarbamate, amount of magnetic nanoparticles, pH, contact time, coexisting ions, desorption solution and reuse times of magnetic solid-phase extraction, were discussed and optimised. The analytes desorbed from magnetic nanoparticles were determined by flame atomic absorption spectrometry. Under the optimum conditions, the analytical linear ranges were 0.02–15 mg/L for Cu and 0.02–20 mg/L for Ni (R2 > 0.9992). The relative standard deviations (RSDs, n = 5) of 1.8% and 2.1% were obtained for Cu and Ni, respectively. The method detection limits were 0.0028 μg/g for Cu and 0...." @default.
• W2215243418 created "2016-06-24" @default.
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• W2215243418 date "2015-11-22" @default.
• W2215243418 modified "2023-09-24" @default.
• W2215243418 title "Flame atomic absorption spectrometric determination of Cu and Ni in tobacco samples after Preconcentration using ammonium pyrrolidine dithiocarbamate modified magnetic nanoparticles" @default.
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• W2215243418 doi "https://doi.org/10.1080/03067319.2015.1100726" @default.
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