Research Article
Water Soluble Cationic Porphyrin Sensor for Detection of Hg2+, Pb2+, Cd2+, and Cu2+
Figure 3
Absorption spectra of aqueous solution of (a) 1 × 10−5 M 1 and 1 × 10−5 Hg2+ (blue curve), (b) 1 × 10−5 M 1 and 1 × 10−5 Pb2+ (brown curve), (c) 1 × 10−5 M 1 and 1 × 10−5 Cd2+ (pink curve), and (d) 1 × 10−5 M 1 and 1 × 10−5 Cu2+ (purple curve).