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Abstract
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In this research, graphitic carbon nitride quantum dots (g-CNQDs) were prepared by a simple and one-step microwave-assisted approach and characterized by X-ray diffraction, Fourier transform infraredspectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The chemilumi-nescence (CL) emission of the synthesized g-CNQDs induced by K3Fe(CN)6as an oxidant along with the CLmechanism were investigated. Based on the diminishing effect of Hg(II) ion on the g-CNQDs–K3Fe(CN)6CL system, a simple and sensitive chemosensor was constructed for Hg(II) ion detection in aqueous solu-tions. A response surface methodology was used to optimize the experimental parameters affecting theanalytical signal. Under the optimized experimental conditions, the calibration graph was linear in therange of 0.25–10 ng mL−1with a detection limit of 0.08 ng mL–1. The inter-day and intra-day relative stan-dard deviations for six replicate determinations of 4 ng mL–1Hg(II) ion were 3.4% and 2.8%, respectively.The developed method was successfully applied for the selective and sensitive determination of Hg(II) inwater and food samples with recoveries in the range of 95.7–102.8% for the spiked samples. The accuracyof the method was evaluated by analyzing a certified reference material (SRM 1566b).
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