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A method is described here for the quickly (<30 s) accurate determination of Cr(VI) (Cr2O72−), based on fluorescent probes gold nanodots (AuNDs, excitation/emission peaks at 395/604 nm) coated with glutathione (GSH). The fluorescence of the AuNDs responses linearly to Cr(VI) concentrations, ranging widely from 1 nM to 10 mM with detection limit as low as 0.35 nM. At the same time, the AuNDs is...
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