Journal
ANALYTICA CHIMICA ACTA
Volume 1232, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aca.2022.340422
Keywords
Fluorescent probe; Environmental samples; Analytical method; Water analysis; Nanomaterial
Categories
Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (FONCYT) [PICT-2016-2506-BID, PICT-2019-03859-BID, PICT-2019-2188]
- Universidad Nacional de La Plata [X-887]
- Universidad Nacional de Cuyo [06/M129]
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In this study, a sensitive and selective detection method for Hg2+ using functionalized graphene quantum dots (GQDs) through front-face fluorescence was reported. The method showed excellent performance even under adverse conditions and in the presence of interferences.
Here we report the use of graphene quantum dots (GQDs), obtained from 3D graphene foam, functionalized with 8-hydroxyquinoline (8-HQ) for the sensitive and selective detection of Hg2+ via front-face fluorescence. The great surface area and active groups within the GQDs permitted the functionalization with 8-HQ to increase their selectivity toward the analyte of interest. The fluorescence probe follows the Stern-Volmer model, yielding a direct relationship between the degree of quenching and the concentration of the analyte. Diverse parameters, including the pH and the use of masking agents, were optimized in order to improve the selectivity toward Hg2+ down to a limit of detection of 2.4 nmol L-1. It is hereby demonstrated that the functionalized GQDs work perfectly fine under adverse conditions such as acidic pH and in the presence of a large number of cationic and anionic interferences for the detection of Hg2+ in real samples. Parallel measurements using cold vapor atomic fluorescence spectrometry also demonstrated an excellent correlation with the front-face fluorescence method applied here for real samples including tap, river, underground, and dam waters.
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