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Absorbance spectrum of iron-chelating chromogenic chelators complexed with metal ions (cited from ref. (23): Clin Chim Acta, 2014; 437: 129–135). Black: Fe2+, red: Cu2+, green: Co2+, blue: Ni2+. (a) BP, (b) Ferrozine, (c) Ferene, and (d) Nitroso-PSAP.
