A Fluorimetric Method Based on an Imidazole Compound for Cu²⁺ Determination in Tap Water

Figure 5

The change in the fluorescence spectra of L with the increasing Cu²⁺ ion concentration (from 0 to 30 μg/L) in acetonitrile-water (1 : 1). Inset: the molar ratio graph plotted from the change in the fluorescence at 360 nm. L: 2.0 × 10⁻⁷ M.