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UV–Vis absorption profiles of the Fe3+/H2(L2) system at I = 0.15 mol L−1 in NaCl(aq), T = 298.15 K and at different pH values. (a) cFe3+ = 2.5·10−4 mol L−1, cligand = 1.8·10−4 mol L−1; (b) cFe3+ = 2.5·10−4 mol L−1, cligand = 5.8·10−4 mol L−1.
