Abstract
In this study, a novel magnetic bucky gel (MBG) was synthesized and coupled with dispersive magnetic solid-phase extraction for preconcentration and determination of trace levels of nitrite in various water samples. The MBG was prepared by dispersing magnetic graphitic carbon nitride nanocomposite (g-C3N4@Fe3O4) in a choline chloride-urea deep eutectic solvent (1:2, molar ratio). The deep eutectic solvent (DES) acts as a disperser and surface modifier for g-C3N4/Fe3O4 nanocomposites simultaneously and led to superior uptake of the analyte in a shorter time. The sorbent was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The NO2− determination was carried out by UV-vis spectrophotometry. Variable factors on preconcentration of NO2− including pH, composition of MBG, contact time, sample volume, eluent type, eluent volume, and elution time were optimized. Under optimum condition, the limit of detection (LOD) was 1.56 μg L−1, the linear dynamic range extended from 5.14 to 900.00 μg L−1, the relative standard deviation (n = 5) and the preconcentration factor were 2.7% and 100, respectively. The method was successfully used for the preconcentration of NO2− ions in different water samples and gave recoveries between 89 and 103%. This article is protected by copyright. All rights reserved
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