Journal
MICROCHIMICA ACTA
Volume 186, Issue 12, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3941-4
Keywords
Inorganic element doping; Carbon nanomaterials; Coordination interaction; Inner filter errect; Reversible discoloration; Visual detection; Biocompatibility
Categories
Funding
- National Natural Science Foundation of China [21864006, 21763005, 21563006]
- Natural Science Foundation of Guangxi Province [2017GXNSFDA198034, 2017GXNSFFA198005, 2016GXNSFBA380118]
- Guangxi Scientific and Technological Development Projects [AD17195081]
- China Scholarship Council Project [201708455047, liujinfa[2017]5086]
- Thousands of Young Teachers Training Program of Guangxi Province [guijiaoren[2018]18]
- High-Level-Innovation Team [guijiaoren[2017]38]
- Outstanding Scholar Project of Guangxi Higher Education Institutes
- BAGUI Scholar Program of Guangxi Province of China
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A rapid, sensitive, and selective fluorometric assay is described for the determination of chromium(VI) in real waters and living cells. The method is making use of nitrogen, phosphorus, and sulfur tri-doped carbon dots (NPS-CDs) which have absorption/emission maxima at 360/505 nm/nm. Cr(VI) has an absorption maximum at 350 nm and causes an inner filter effect (IFE) on the blue fluorescence of the NPS-CDs. The NPS-CDs were hydrothermally synthesized using p-aminobenzenesulfonic acid and tetrakis(hydroxymethyl)phosphonium chloride as precursors. The NPS-CDs were characterized by transmission electron microscopy, X-ray diffraction, and several spectroscopic methods. They are biocompatible and negligibly cytotoxic when tested with HeLa cells and MCF-7 cells even after 48 h of incubation. The NPS-CDs were used as fluorescent probes for Cr(VI). The detection limit is 0.23 mu M (three times standard deviation versus slope), and the linear response covers the 1 to 500 mu M chromate concentration range. The NPS-CDs were applied to the determination of Cr(VI) in real waters and living cells (HeLa and MCF-7) and gave satisfying results.
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