Some Considerations of the Important Chemical Processes in Acid Deposition

摘要: The chemistry of the gas phase and that aqueous, cloud water, couple strongly to create many important pathways for acid generation in troposphere. theoretical rates alternative reactions forming sulfuric nitric acids are estimated. major routes involve HO-radical attack on SO2 NO2. generated species, HO, HO2, NO3, N2O5 may be captured by react droplets provide HSO 3 - oxidation H2SO4, NO3 conversion HONO2, HO2(O 2 ) form H2O2, provided sticking coefficients these reactive transients greater than 10-3. molecules O3, CH3COO2NO2, products reactions, when absorbed into water along with SO2, reactants H2SO4. In general very much larger those phase; differences rationalized terms chemical physical properties systems. mechanisms phase, aqueous solid-photosensitized formation oxidant, hydrogen peroxide, compared. Some uncertainties development troposphere, construction rain models, identified.