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Novel absorbance peak of gentisic acid following the oxidation reaction

Fig 4

Color changes in and absorption spectra of GA after the addition of different additive reagents.

(a) 400 mg/L GA after the addition of NaOH (I) or NaOH with NaOCl·5H₂O (II). (b) Absorption spectra of 400 mg/L GA after the addition of NaOH or NaOH with NaOCl·5H₂O.

doi: https://doi.org/10.1371/journal.pone.0232263.g004