During the backward scan, at potentials <+0.2 V, two reversible processes of reduction are observed, as was discussed in Figure . Analysing the response of Bidim-SEC in parallel configuration (Figure D), it is observed that the absorbance at the three selected wavelengths (240, 261, 289 nm) decreases reversibly during the reversible reduction observed at -0.20 V. This fact confirms that several oxidation products are being reduced in this process, as will be explained later.