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

Figure 4

(a) Fluorescence titration of C-GGH-Cu²⁺ (1.0 μmol/L) with CN⁻ (0–30 equiv., 0.0, 0.2, 0.5, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 20.0, 25.0, and 30.0 μmol/L, resp.) in HEPES aqueous buffer (10 mmol/L, pH 10.0). (b) Dose-dependent luminescence response of C-GGH-Cu²⁺ (1.0 μmol/L) to CN⁻.

(a)

(b)