| Autor: |
Kenneth S, Docherty, Robert, Yaga, William, Preston, Mohammed, Jaoui, Theran P, Reidel, John H, Offenberg, Tadeusz E, Kleindienst, Michael, Lewandowski |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Atmos Environ (1994) |
| ISSN: |
1352-2310 |
| Popis: |
A series of chamber experiments was conducted to investigate the composition of secondary organic aerosol (SOA) following oxidation of a range of parent n-alkanes (C(10)–C(17)) in the presence of NO(x). The relative contribution of selected species representing first, second, and higher generation products to SOA mass was measured using a high-resolution aerosol mass spectrometer. Gas chromatography was also used for a limited set of amenable species. Relative contributions varied substantially across the range of investigated alkanes reflecting slight changes in SOA composition. The contribution of first-generation cyclic hemiacetal is minimal toward the small end of the investigated range and gradually increase with n-alkane size. The relative contribution of second generation and higher nitrate-containing species, in contrast, decrease with an increased alkane size. A similar trend is observed for relative contribution of organonitrates to SOA. Finally, SOA yield and composition are sensitive to water vapor concentrations. This sensitivity is limited to a narrow range (dry to ~15% RH) with little, if any, impact above 15% suggesting that this impact may be negligible under ambient conditions. The impact of water vapor also appears to decrease with increasing alkane carbon number. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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