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Dr-Nb(III)-mediated isomerization of peroxynitrite in the absence and presence of CO2 (representing the CO2/HCO3−/CO32− system). The disappearance of the pH-dependent ONOO−/ONOOH species is characterized by the absorption decrease at 302 nm. For the sake of clarity, only the final products of the peroxynitrite inactivation mechanisms (indicated by k0 and k0H) are reported, while the intermediate species are described in the text.
