Aqueous phase and interfacial chemistry

N2O5 and HNO3 will be quantitatively scavenged by natural waters. Nitric acid is a strong acid and thereby fully dissociated (Table 4.9), whereas nitrous acid is roughly 50 % dissociated in hydrometeors. 

When N2O5 sticks to the water s surface, it is completely and quickly converted into nitrate ions. The nitrate radical NO2 can react with all electron donors according to 

It reacts with dissolved hydrocarbons (5.178) but is likely to be dominated by chloride and sulfite. The fate of Cl radicals is described in Chapter 5.8.2 and that of sulfite radicals in Chapter 5.5.2.2 A 5i95 = 9.3 10 L mol s and A 5i96 1.7 

Nitrate ions can be photolyzed however, in the bulk water phase the reaction is too slow (/ = 10 s ). The photodecomposition of NOJ into OH and NO species within and upon ice has been discussed over the past decade and can be crucial to the chemistry of snowpacks and the composition of the overhead atmospheric boundary layer (Dubowski et al. 2002, Chu and Anastasio 2003 and citations therein) A 300 nm and pH 6  

In the absence of radical scavengers, nitrate can react with oxygen h 

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