fig2
Figure 2. Fluorescence spectra (A) and quenching efficiencies (B) of HNU-G4 by various metal ions; (C) Fluorescence intensity of HNU-G4 in different concentrations of Pb(II) solutions, the illustration shows the linear relationship at low concentrations; (D) Fluorescence intensity of HNU-G4 in mixed solutions of other single metal ions and Pb(II).
