The Sulfuric Acid-Ammonia-Water System

Consider a simplified system containing only H2SO4, NH3, and water. The problem we are interested in is the following given the temperature (T), RH, and available ammonia and sulfuric acid, determine the aerosol composition. [Pg.470]

A series of compounds may exist in the aerosol phase including solids like letovicite ((NH4)3H(S04)2),(NH4)2S04, and NH4HSO4, but also aqueous solutions of NH4, SO, HS04, and NH3(aq). The possible reactions in the system are shown in Table 10.7. [Pg.470]

FIGURE 10.17 Aerosol composition for a system containing lOpgirT3 H2S04 at 30% RH and T = 298 K as a function of the total (gas plus aerosol) concentration. The composition was calculated using the approach of Pilinis and Seinfeld (1987). [Pg.471]

Summarizing, in very acidic atmospheres (NH3/H2SO4 molar ratio less than 0.5) the aerosol particles exist primarily as H2SO4 solutions. For acidic atmospheres (NH3/H2SO4 molar ratio in the 0.5-1.5 range) the particles consist mainly as bisulfate. If there is sufficient ammonia to neutralize the available sulfuric acid, (NH4)2S04 (or an NH4 and SC 4 solution) is the prefered composition of the aerosol phase. For acidic atmospheres all the available ammonia is taken up by the aerosol phase and only for NH3/H2SO4 molar ratios above 2 can ammonia also exist in the gas phase. [Pg.472]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...