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Volatile organic compound conversion by ozone, hydroxyl radicals, and nitrate radicals in residential indoor air: Magnitudes and impacts of oxidant sources

Filetype[PDF-1.33 MB]


  • English
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    Details:

    • Alternative Title:
      Atmos Environ (1994)
    • Personal Author:
    • Description:
      Indoor chemistry may be initiated by reactions of ozone (O|), the hydroxyl radical (OH), or the nitrate radical (NO|) with volatile organic compounds (VOC). The principal indoor source of O| is air exchange, while OH and NO| formation are considered as primarily from O| reactions with alkenes and nitrogen dioxide (NO|), respectively. Herein, we used time-averaged models for residences to predict O|, OH, and NO| concentrations and their impacts on conversion of typical residential VOC profiles, within a Monte Carlo framework that varied inputs probabilistically. We accounted for established oxidant sources, as well as explored the importance of two newly realized indoor sources: (|) the photolysis of nitrous acid (HONO) indoors to generate OH and (|) the reaction of stabilized Criegee intermediates (SCI) with NO| to generate NO|. We found total VOC conversion to be dominated by reactions both with O|, which almost solely reacted with d-limonene, | also with OH, which reacted with d-limonene, other terpenes, alcohols, aldehydes, and aromatics. VOC oxidation rates increased with air exchange, outdoor O|, NO| and d-limonene sources, and indoor photolysis rates; and they decreased with O| deposition and nitric oxide (NO) sources. Photolysis was a strong OH formation mechanism for high NO, NO|, and HONO settings, but SCI/NO| reactions weakly generated NO| except for only a few cases.
    • Subjects:
    • Source:
      Atmos Environ (1994). 106:382-391
    • Pubmed ID:
      26855604
    • Pubmed Central ID:
      PMC4741105
    • Document Type:
      Journal Article
    • Funding:
      CC999999/Intramural CDC HHS/United States
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