Fig. 5.

FTIR difference spectra calculated from the absorption spectra of SOR–ferrocyanide solutions recorded after minus before the reaction with 55 μM O₂^·̅, generated by γ-ray radiolysis. The solution contained a 100 μM concentration of SOR and various concentration of ferrocyanide at pH 7.6. In the upper spectrum, the sample contains 2 molar equivalents of ferrocyanide with respect to SOR. In the lower spectrum, the sample contains 5 molar equivalents of ferrocyanide with respect to SOR. The quantification of the ferrocyanide (2,037 cm⁻¹) and ferricyanide (2,115 cm⁻¹) bands were deduced from FTIR spectra recorded in the same conditions with solutions of known concentration for each species.