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• W2145683506 abstract "This work presents a simple, fast and sensitive method for the preconcentration and quantification of graphene quantum dots (GQDs) in aqueous samples. GQDs are considered an object of analysis (analyte) not an analytical tool which is the most frequent situation in Analytical Nanoscience and Nanotechnology. This approach is based on the preconcentration of graphene quantum dots on an anion exchange sorbent by solid phase extraction and their subsequent elution prior fluorimetric analysis of the solution containing graphene quantum dots. Parameters of the extraction procedure such as sample volume, type of solvent, sample pH, sample flow rate and elution conditions were investigated in order to achieve extraction efficiency. The limits of detection and quantification were 7.5 μg L−1 and 25 μg L−1, respectively. The precision for 200 μg L−1, expressed as %RSD, was 2.8%. Recoveries percentages between 86.9 and 103.9% were obtained for two different concentration levels. Interferences from other nanoparticles were studied and no significant changes were observed at the concentration levels tested. Consequently, the optimized procedure has great potential to be applied to the determination of graphene quantum dots at trace levels in drinking and environmental waters." @default.
• W2145683506 created "2016-06-24" @default.
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• W2145683506 date "2015-10-01" @default.
• W2145683506 modified "2023-10-16" @default.
• W2145683506 title "Fluorescent determination of graphene quantum dots in water samples" @default.
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• W2145683506 doi "https://doi.org/10.1016/j.aca.2015.09.019" @default.
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