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Coupled Partitioning, Dilution, and Chemical Aging of Semivolatile Organics
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 rev...
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Published in: | Environmental science & technology 2006-04, Vol.40 (8), p.2635-2643 |
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container_end_page | 2643 |
container_issue | 8 |
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container_title | Environmental science & technology |
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creator | Donahue, N. M Robinson, A. L Stanier, C. O Pandis, S. N |
description | 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 μg 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 ∼1 mg m-3) may contribute significantly to ambient SOA formation. |
doi_str_mv | 10.1021/es052297c |
format | article |
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source | American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list) |
subjects | Aerosols Air Pollutants Applied sciences Atmospheric pollution Emissions Exact sciences and technology Models, Chemical Organic Chemicals - chemistry Oxidation Oxidation-Reduction Pollutants physicochemistry study: properties, effects, reactions, transport and distribution Pollution Temperature VOCs Volatile organic compounds Volatility Volatilization |
title | Coupled Partitioning, Dilution, and Chemical Aging of Semivolatile Organics |
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