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Sulfuric acid aerosols and HCl release in coastal atmospheres: Evidence of rapid formation of sulfuric acid particulates
Abstract Hi-vol paniculate samples obtained during two summertime experiments at coastal locations were analyzed for seasalt constituents, NH4 +, and NO3 −. The average stoichiometry of samples classified by backwards air mass trajectories of sampled air was examined to aid in determining the origin and chemical state of the non-seasalt sulfate. Excess sulfate was found in all samples and strongly associated with loss of chloride from seasalt particulates. Most of the excess sulfate present in concentrations ranging from 1 to 20 μg m−3 was present as sulfuric acid and active in volatilizing chloride from the samples. The sulfuric acid was produced by extremely rapid gas-particle reactions in the seasalt aerosols which reduced their pH to the level of 1–3 required for chloride volatilization. The total amount of excess sulfate present in samples which had lost all chloride was found to be controlled by the amount of seasalt initially present, and the absorption of the sulfur gas and its oxidation to sulfuric acid appears to occur at very low pH values, but to be stopped at some value below that required to volatilize chloride. The air mass sources and absence of local SO2 observed during one experiment imply a local biological origin for up to 20 μg excess sulfate m−3. None of the particulate sulfate observed during these experiments was transported to the sites in air masses, although meteorological conditions favoring such transport occurred often during the second experiment.
Sulfuric acid aerosols and HCl release in coastal atmospheres: Evidence of rapid formation of sulfuric acid particulates
Abstract Hi-vol paniculate samples obtained during two summertime experiments at coastal locations were analyzed for seasalt constituents, NH4 +, and NO3 −. The average stoichiometry of samples classified by backwards air mass trajectories of sampled air was examined to aid in determining the origin and chemical state of the non-seasalt sulfate. Excess sulfate was found in all samples and strongly associated with loss of chloride from seasalt particulates. Most of the excess sulfate present in concentrations ranging from 1 to 20 μg m−3 was present as sulfuric acid and active in volatilizing chloride from the samples. The sulfuric acid was produced by extremely rapid gas-particle reactions in the seasalt aerosols which reduced their pH to the level of 1–3 required for chloride volatilization. The total amount of excess sulfate present in samples which had lost all chloride was found to be controlled by the amount of seasalt initially present, and the absorption of the sulfur gas and its oxidation to sulfuric acid appears to occur at very low pH values, but to be stopped at some value below that required to volatilize chloride. The air mass sources and absence of local SO2 observed during one experiment imply a local biological origin for up to 20 μg excess sulfate m−3. None of the particulate sulfate observed during these experiments was transported to the sites in air masses, although meteorological conditions favoring such transport occurred often during the second experiment.
Sulfuric acid aerosols and HCl release in coastal atmospheres: Evidence of rapid formation of sulfuric acid particulates
Hitchcock, Dian R. (author) / Spiller, Lester L. (author) / Wilson, William E. (author)
Atmospheric Environment ; 14 ; 165-182
1979-09-01
18 pages
Article (Journal)
Electronic Resource
English
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