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.

中文翻译：

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使用光致发光铜纳米簇控制pH值以分别定量亚硝酸盐和氰化物离子

的双重感测探头已发展为亚硝酸盐的检测（NO ₂ ^- ）和氰化物（CN ^- ）离子基于淬火硫代水杨酸（TA）封端的铜（Cu）的纳米团簇的分析物引发的光致发光（PL）（NC ）集合。由Cu ²⁺和TA制备的TA-Cu NC聚集体在338 nm激发时在420 nm处发射，量子产率为13.2％。在TA-Cu系NC聚集体由NO的PL猝灭₂ ^-是通过HNO之间的氧化还原反应₂酸性条件下和TA，而由CN ^-在碱性溶液中的离子是通过蚀刻工艺。通过将pH值控制在5.0，然后控制在8.0，探针可以连续定量NO ₂^-和CN ^-离子的水样中，以检测为5μM和的极限为5nM，分别在为3的信噪比该探针的实用性已经通过NO的浓度的测定验证₂ ^-和CN ^-代表湖泊水样中的离子。