Uptake of gas‐phase SO₂ in aqueous sulfuric acid: Oxidation by H₂O₂, O₃, and HONO

Uptake of SO 2 (g) was measured as a function of sulfuric acid concentration in the range pH = 1 to 70 wt% H 2 SO 4 at 293 K. Uptake studies were carried out in the presence of solvated H 2 O 2 , O 3 , HONO, NO 2 , and HNO 3 . The studies yielded Henry's law coefficients for SO 2 which were in accord with previous measurements. The results provided first time determinations at high acidities of rate coefficients for the reaction of SO 2 with H 2 O 2 , O 3 , and HONO in the solvated state. The observed SO 2 (g) uptake was consistent with bulk phase oxidation processes. The measured rate coefficients were used to evaluate the role of heterogeneous interactions with the selected species for aerosol formation in aircraft plumes. Calculations show that these interactions are insignificant compared to gas phase oxidation by the OH radical.