Photolysis of aqueous solutions of aniline-2,5-disulfonic acid: steady state and laser flash photolysis studies.

The photochemical behaviour of aniline-2,5-disulfonic acid (ADSA) in aqueous solutions upon excitation at 254 nm, 310 nm and 334 nm has been studied. A specific phototransformation into o-anilinesulfonic acid (o-AS) via a desulfonation process was observed. Such a reaction was efficiently inhibited by molecular oxygen.