Adsorption of Pb(II) and Cd(II) by Squid Ommastrephes bartrami Melanin

Figure 4

IR spectrum of heavy metal enriched squid melanin as a function of the solution concentration of Pb(II) in spectral region of (a) 900–1900 cm⁻¹; (b) 2000–4000 cm⁻¹. The spectra are normalized to the intensity of the 1598 cm⁻¹ peak.

(a)

(b)