Obiyenwa, Gabriel Kehinde, et al. “Soluble Anionic Porphyrin for Detecting Hg(II), Cd(II), Pb(II), Cu(II), Fe(III), and Zn(II) Ions by Fluorescence and UV-Visible Spectral Studies”. International Journal Of Research And Technopreneurial Innovations, vol. 3, no. 2, Nov. 2026, pp. 1-20, https://doi.org/10.60787/ijrti.vol3no2.91.