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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.

Authors
Waring-MS; Wells-JR
Source
Atmos Environ 2015 Apr; 106:382-391
NIOSHTIC No.
20044756
Abstract
Indoor chemistry may be initiated by reactions of ozone (O3), the hydroxyl radical (OH), or the nitrate radical (NO3) with volatile organic compounds (VOC). The principal indoor source of O3 is air exchange, while OH and NO3 formation are considered as primarily from O3 reactions with alkenes and nitrogen dioxide (NO2), respectively. Herein, we used time-averaged models for residences to predict O3, OH, and NO3 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: (i) the photolysis of nitrous acid (HONO) indoors to generate OH and (ii) the reaction of stabilized Criegee intermediates (SCI) with NO2 to generate NO3. We found total VOC conversion to be dominated by reactions both with O3, which almost solely reacted with D-limonene, and also with OH, which reacted with D-limonene, other terpenes, alcohols, aldehydes, and aromatics. VOC oxidation rates increased with air exchange, outdoor O3, NO2 and D-limonene sources, and indoor photolysis rates; and they decreased with O3 deposition and nitric oxide (NO) sources. Photolysis was a strong OH formation mechanism for high NO, NO2, and HONO settings, but SCI/NO2 reactions weakly generated NO3 except for only a few cases.
Keywords
Organic-compounds; Volatiles; Chemical-composition; Chemical-properties; Models; Terpene-compounds; Indoor-air-pollution; Indoor-environmental-quality; Author Keywords: Indoor chemistry; VOC oxidation; Monte Carlo modeling; Photolysis; Terpenes
Contact
Michael S. Waring, Drexel University, Department of Civil, Architectural and Environmental Engineering, 3141 Chestnut St., Philadelphia, PA 19104
CODEN
AENVEQ
CAS No.
10102-44-0; 10024-97-2
Publication Date
20150401
Document Type
Journal Article
Email Address
msw59@drexel.edu
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
M072014
ISSN
1352-2310
NIOSH Division
HELD
Priority Area
Healthcare and Social Assistance; Services
Source Name
Atmospheric Environment
State
PA; WV
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