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Production of N2O5 and ClNO2 through Nocturnal Processing of Biomass-Burning Aerosol

Biomass burning is a source of both particulate chloride and nitrogen oxides, two important precursors for the formation of nitryl chloride (ClNO2), a source of atmospheric oxidants that is poorly prescribed in atmospheric models. We investigated the ability of biomass burning to produce N2O5(g) and ClNO2(g) through nocturnal chemistry using authentic biomass-burning emissions in a smog chamber. There was a positive relationship between the amount of ClNO2 formed and the total amount of particulate chloride emitted and with the chloride fraction of nonrefractory particle mass. In every fuel tested, dinitrogen pentoxide (N2O5) formed quickly, following the addition of ozone to the smoke aerosol, and ClNO2(g) production promptly followed. At atmospherically relevant relative humidities, the particulate chloride in the biomass-burning aerosol was rapidly but incompletely displaced, likely by the nitric acid produced largely by the heterogeneous uptake of N2O5(g). Despite this chloride acid displacement, the ...

Authors:   Adam T. Ahern; Lexie Goldberger; Lydia Jahl; Joel Thornton; Ryan C. Sullivan
Journal:   Environmental Science & Technology
Year:   2017
DOI:   10.1021/acs.est.7b04386
Publication date:   21-Dec-2017
Facts, background information, dossiers
  • biomass
  • production
  • Total
  • ozone
  • nitrogen oxides
  • nitric acid
More about American Chemical Society Publications
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