Figure 6

(a) Comparison of Hg²⁺-induced fluorescence responses between the common test strips and the developed test strips in the (1, 3) absence and (2, 4) presence of Hg²⁺ ions (0.10 μM), with the fluorescence quenching efficiencies. Insert: the corresponding photographs under UV light. (b) Fluorescence quenching efficiencies versus the logarithmic concentrations of Hg²⁺ ions spiked in wastewater analyzed by the developed test strips (red line) and the common test strips (blue line). Insert: the corresponding photographs of the developed test strips for Hg²⁺ ions under UV light.