Mechanism of pyrogallol red oxidation induced by free radicals and reactive oxidant species: a kinetic and spectroelectrochemistry study - Atala, E; Velasquez, G; Vergara, C; Mardones, C; Reyes, J; Tapia, Agustin Leon; Quina, Frank Herbert; Mendes, Maria Anita; Speisky, H; Lissi, Eduardo; Ureta-Zanartu, M. S; Aspée, A; et al. (Journal of Physical Chemistry B, 2013)