Research Article
Water Soluble Cationic Porphyrin Sensor for Detection of Hg2+, Pb2+, Cd2+, and Cu2+
Figure 6
The electronic absorption spectra of aqueous solution of (a) 1-Hg 2+ (5.0 × 10−6 M 1 and 4.0 × 10−6 M Hg2+, blue curve), (b) 1-Pb 2+ (5.0 × 10−6 M 1 and 4.0 × 10−6 M Pb2+, brown curve), and (c) 1-Cd 2+ (5.0 × 10−6 M 1 and 4.0 × 10−6 M Cd2+, pink curve) upon addition of Cu2+ ions (5 × 10−6 M for 1-Hg 2+ and 1-Pb 2+, 4 × 10−6 M for 1-Cd 2+).
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