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

Figure 7

The change in the fluorescence intensity with the increasing Cu²⁺ concentration at 360 nm in acetonitrile-water (1 : 1). L: 2.0 × 10⁻⁷ M. Inset: deviation from Beer’s law after 15 μg/L of Cu²⁺ concentration.