Figure 4.

Rate of dissolved oxygen decay ($R_{{-\mathrm{O}}_2\left(aq\right)}$) vs. dissolved oxygen concentration ([O₂(aq)]) during irradiation (λ ≥ 305 nm, I_a = 1.02 × 10⁻⁵ Einstein L⁻¹ s⁻¹) of 20.0 mM solutions of PA at pH 1.0 and 25 °C with continuous air sparging at 100.0 mL min⁻¹ (incomplete oxygen depleted regime). For reference, the top horizontal axis represents the mixing ratio of O₂(g) dissolved in N₂(g). Represented reaction rates are multiplied by −1.