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• W2042398873 abstract "The performance of Al2O3/MWCNT nanocomposite as a new sorbent for Ni(II) preconcentration from water samples, using a flow injection system coupled to flame atomic absorption spectrometry, is described in this study. The characterization of the nanocomposite was carried out by using thermogravimetric analysis (TG), BET surface area, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The analytical procedure involved the preconcentration of 20 mL Ni(II) solution buffered with 0.24 mol L−1 amoniacal buffer at pH 9.0 through 50 mg of the nanocomposite packed into a minicolumn, followed by the elution in countercurrent using 1.0 mol L−1 HNO3 solution at flow rate of 5.0 mL min−1. Factors involved in the flow and chemical performance of the system were optimized by means of factorial design. The method provided a preconcentration factor of 20.9, linear range varying from 13.6 up to 230.0 μg L−1 and detection limit of 4.1 μg L−1 under optimized conditions. The proposed method was validated from recovery tests for Ni(II) determination in water samples, whose values ranged from 95.7 up to 99.1%, thus confirming the accuracy of the proposed method and the feasibility of Al2O3/MWCNT nanocomposite in the field of solid-phase preconcentration procedures." @default.
• W2042398873 created "2016-06-24" @default.
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• W2042398873 date "2007-12-01" @default.
• W2042398873 modified "2023-10-03" @default.
• W2042398873 title "Assessment of nanocomposite alumina supported on multi-wall carbon nanotubes as sorbent for on-line nickel preconcentration in water samples" @default.
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• W2042398873 doi "https://doi.org/10.1016/j.seppur.2007.07.024" @default.
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