Figure 2.

Dependencies on the solution pH of the peroxynitrite formation rate constant (k_form, ○) and the normalized absorbance amplitude recorded at 315 nm after completion of the reaction (□). Conditions were: 0.15 mM N₂O in O₂-saturated solution; pH ≥ 11 were maintained with NaOH, pH < 11 with 0.1 M borate. The solid lines show theoretical dependencies with k₇ = 4.9 × 10⁴ M⁻¹⋅s⁻¹, k₉ = 8 × 10⁶ M⁻¹⋅s⁻¹, and [¹HNO]₀ = 0.05 mM, calculated as described in the text and Note 1.