Selective and Sensitive Detection of Cyanide Based on the Displacement Strategy Using a Water-Soluble Fluorescent Probe

Figure 2

(a) Fluorescence responses of C-GGH (1 μmol/L) to different ions (2 equiv. for K⁺, Zn²⁺, Fe²⁺, Fe³⁺, Ca²⁺, Na⁺, Mn²⁺, Mg²⁺, Al³⁺, and Pb²⁺; 1 equiv for Cu²⁺) in HEPES buffer aqueous solution (10 mmol/L, pH 10.0). Fluorescence titration of C-GGH (1 μmol/L) with Cu²⁺ (0–2 equiv.) in HEPES aqueous buffer (10 mmol/L, pH 10.0). Inset shows fluorescence changes of C-GGH at 478 nm as a function of the Cu²⁺ concentration.

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