Journal article
Coupled partitioning, dilution, and chemical aging of semivolatile organics
Environmental science & technology, Vol.40(8), pp.2635-2643
04/15/2006
DOI: 10.1021/es052297c
PMID: 16683603
Abstract
A unified framework of semi-volatile partitioning permits models to efficiently treat both semi-volatile primary emissions and secondary organic aerosol production (SOA), and then to treat the chemical evolution (aging) of the aggregate distribution of semi-volatile material. This framework also reveals critical deficiencies in current emissions and SOA formation measurements. The key feature of this treatment is a uniform basis set of saturation vapor pressures spanning the range of ambient organic saturation concentrations, from effectively nonvolatile material at 0.01 microg m(-3) to vapor-phase effluents at 100 mg m(-3). Chemical evolution can be treated by a transformation matrix coupling the various basis vectors. Using this framework, we show that semi-volatile partitioning can be described in a self-consistent way, with realistic behavior with respect to temperature and varying organic aerosol loading. The time evolution strongly suggests that neglected oxidation of numerous "intermediate volatility" vapors (IVOCs, with saturation concentrations above approximately 1 mg m(-3)) may contribute significantly to ambient SOA formation.
Details
- Title: Subtitle
- Coupled partitioning, dilution, and chemical aging of semivolatile organics
- Creators
- N M Donahue - Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAA L RobinsonC O StanierS N Pandis
- Resource Type
- Journal article
- Publication Details
- Environmental science & technology, Vol.40(8), pp.2635-2643
- Publisher
- United States
- DOI
- 10.1021/es052297c
- PMID
- 16683603
- ISSN
- 0013-936X
- eISSN
- 1520-5851
- Language
- English
- Date published
- 04/15/2006
- Academic Unit
- Chemical and Biochemical Engineering
- Record Identifier
- 9984003950902771
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