Dynamic Behavior of Solutions with Aqueous-Phase Chemical Reactions

6 DYNAMIC BEHAVIOR OF SOLUTIONS WITH AQUEOUS-PHASE CHEMICAL REACTIONS 

In our calculations up to this point we have simply assumed values for the gas-phase partial pressures. When the process occurs over time, one must consider also what is occurring in the gas phase. Two assumptions can be made concerning the gas phase  

Open System. Gas-phase partial pressures are maintained at constant values, presumably by continous infusion of new air. This is a convenient assumption for order of magnitude calculations, but it is often not realistic. Up to now we have implicitly treated the cloud environment as an open system. Note that mass balances (e.g., for sulfur) are not satisfied in such a system, because there is continuous addition of material. 

Closed System. Gas-phase partial pressures decrease with time as material is depleted from the gas phase. One needs to describe mathematically both the gas-and aqueous-phase concentrations of the species in this case. Calculations are more 

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DYNAMIC BEHAVIOR OF SOLUTIONS WITH AQUEOUS-PHASE CHEMICAL REACTIONS 385 6.9.1 Closed System... 

Nitrogen Radicals 381 Aqueous-Phase Organic Chemistry 381 Oxygen and Hydrogen Chemistry 383 Dynamic Behavior of Solutions with Aqueous-Phase Chemical Reactions 384... 

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