Figure 4

UV–Visible spectra of the complexation systems of MTB with (a) Zn^II, (b) Cu^II and (c) Fe^II, the concentration (d–f) and spectral (g–i) profiles obtained using MCR-ALS. The numbers 1 and 75 corresponds to 0 and 2.96 R values, respectively. The LOF values were below 1%.