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Control of pH for separated quantitation of nitrite and cyanide ions using photoluminescent copper nanoclusters

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Abstract

A dual sensing probe has been developed for the detection of nitrite (NO2) and cyanide (CN) ions based on the analyte-induced photoluminescence (PL) quenching of thiosalicylic acid (TA) capped-copper (Cu) nanocluster (NC) aggregates. The TA–Cu NC aggregates prepared from Cu2+ and TA emit at 420 nm when excited at 338 nm, with a quantum yield of 13.2%. The PL quenching of the TA–Cu NC aggregates by NO2 is through a redox reaction between HNO2 and TA under acidic conditions, while that by CN ions in a basic solution is through an etching process. By controlling pH values at 5.0 and then at 8.0, the probe allows consecutive quantitation of NO2 and CN ions in water samples, with limits of detection of 5 μM and 5 nM, respectively, at a signal-to-noise ratio of 3. The practicality of this probe has been validated through the determination of the concentrations of NO2 and CN ions in representative lake water samples.

Graphical abstract: Control of pH for separated quantitation of nitrite and cyanide ions using photoluminescent copper nanoclusters

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Publication details

The article was received on 23 May 2017, accepted on 15 Aug 2017 and first published on 17 Aug 2017


Article type: Paper
DOI: 10.1039/C7AY01300K
Citation: Anal. Methods, 2017, Advance Article
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    Control of pH for separated quantitation of nitrite and cyanide ions using photoluminescent copper nanoclusters

    J. Cang, C. Wang, P. Chen, Y. Lin, Y. Li and H. Chang, Anal. Methods, 2017, Advance Article , DOI: 10.1039/C7AY01300K

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