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The effect of atmospheric SO2 photochemistry upon observed nitrate concentrations in aerosols
Abstract In this study, X-ray photoelectron spectroscopy was used to observe the relationship between the nitrate and sulfate content of photochemically formed aerosol particles which were produced by exposing initially particle-free ambient air in a 14 m3 transparent Teflon chamber to sunlight with various amounts of NO2, SO2, and C3H6 added to the reaction mixture. It was observed that the photochemical oxidation of SO2 to SO4 2− decreased the amount of nitrates present in the aerosol significantly below that observed in the absence of SO2. It was also found that nitrate could be removed from an aerosol sample on a glass fiber filter by passing air with sulfate-containing aerosols through the filter. These observations indicate that H2SO4 formed from the photochemical oxidation of SO2 in the reaction chamber released NO3 − from the surface of the aerosol particles, probably in the form of HNO3. An examination of analyses of ambient aerosols from the Los Angeles area showed a number of cases where a similar inverse relationship between particulate sulfate and nitrate content existed.
The effect of atmospheric SO2 photochemistry upon observed nitrate concentrations in aerosols
Abstract In this study, X-ray photoelectron spectroscopy was used to observe the relationship between the nitrate and sulfate content of photochemically formed aerosol particles which were produced by exposing initially particle-free ambient air in a 14 m3 transparent Teflon chamber to sunlight with various amounts of NO2, SO2, and C3H6 added to the reaction mixture. It was observed that the photochemical oxidation of SO2 to SO4 2− decreased the amount of nitrates present in the aerosol significantly below that observed in the absence of SO2. It was also found that nitrate could be removed from an aerosol sample on a glass fiber filter by passing air with sulfate-containing aerosols through the filter. These observations indicate that H2SO4 formed from the photochemical oxidation of SO2 in the reaction chamber released NO3 − from the surface of the aerosol particles, probably in the form of HNO3. An examination of analyses of ambient aerosols from the Los Angeles area showed a number of cases where a similar inverse relationship between particulate sulfate and nitrate content existed.
The effect of atmospheric SO2 photochemistry upon observed nitrate concentrations in aerosols
Harker, A.B. (author) / Richards, L.W. (author) / Clark, W.E. (author)
Atmospheric Environment ; 11 ; 87-91
1976-06-11
5 pages
Article (Journal)
Electronic Resource
English
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