<i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry
The biogenic volatile organic compound <i>α</i>-pinene is one of the dominant monoterpenes emitted to the Earth's atmosphere at an estimated rate of ~50 Tg C yr<sup>−1</sup>. Its atmospheric oxidation products in the presence of NO can lead to ozone production,...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-07-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/11/6337/2011/acp-11-6337-2011.pdf |
| _version_ | 1811259737613795328 |
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| author | P. B. Shepson P. V. Ramachandran B. A. Nault P. D. Gagare K. M. McAvey S. X. Ma J. D. Rindelaub |
| author_facet | P. B. Shepson P. V. Ramachandran B. A. Nault P. D. Gagare K. M. McAvey S. X. Ma J. D. Rindelaub |
| author_sort | P. B. Shepson |
| collection | DOAJ |
| description | The biogenic volatile organic compound <i>α</i>-pinene is one of the dominant monoterpenes emitted to the Earth's atmosphere at an estimated rate of ~50 Tg C yr<sup>−1</sup>. Its atmospheric oxidation products in the presence of NO can lead to ozone production, as well as production of secondary organic aerosol (SOA). The major oxidation pathway of <i>α</i>-pinene is reaction with OH, which in the presence of NO can form either α-pinene nitrates or convert NO to NO<sub>2</sub>, which can photolyze to form ozone. In this work, we successfully synthesized four <i>α</i>-pinene hydroxy nitrates through three different routes, and have identified these 4 individual isomers in <i>α</i>-pinene/OH/NO reaction chamber experiments. From the experiments, we determined their individual production yields, estimated the total RONO<sub>2</sub> yield, and calculated the relative branching ratios of the nitrate precursor peroxy radicals (RO<sub>2</sub>). The combined yield of the four <i>α</i>-pinene nitrates was found to be 0.130 (±0.035) at atmospheric pressure and 296 K, and the total organic nitrate yield was estimated to be 0.19 (+0.10/−0.06). We also determined the OH rate constants for two of the isomers, and have calculated their overall atmospheric lifetimes, which range between 22 and 38 h. |
| first_indexed | 2024-04-12T18:37:08Z |
| format | Article |
| id | doaj.art-cc35458bc9f14d89b34132e136e5d7e9 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-12T18:37:08Z |
| publishDate | 2011-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-cc35458bc9f14d89b34132e136e5d7e92022-12-22T03:20:55ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242011-07-0111136337634710.5194/acp-11-6337-2011<i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistryP. B. ShepsonP. V. RamachandranB. A. NaultP. D. GagareK. M. McAveyS. X. MaJ. D. RindelaubThe biogenic volatile organic compound <i>α</i>-pinene is one of the dominant monoterpenes emitted to the Earth's atmosphere at an estimated rate of ~50 Tg C yr<sup>−1</sup>. Its atmospheric oxidation products in the presence of NO can lead to ozone production, as well as production of secondary organic aerosol (SOA). The major oxidation pathway of <i>α</i>-pinene is reaction with OH, which in the presence of NO can form either α-pinene nitrates or convert NO to NO<sub>2</sub>, which can photolyze to form ozone. In this work, we successfully synthesized four <i>α</i>-pinene hydroxy nitrates through three different routes, and have identified these 4 individual isomers in <i>α</i>-pinene/OH/NO reaction chamber experiments. From the experiments, we determined their individual production yields, estimated the total RONO<sub>2</sub> yield, and calculated the relative branching ratios of the nitrate precursor peroxy radicals (RO<sub>2</sub>). The combined yield of the four <i>α</i>-pinene nitrates was found to be 0.130 (±0.035) at atmospheric pressure and 296 K, and the total organic nitrate yield was estimated to be 0.19 (+0.10/−0.06). We also determined the OH rate constants for two of the isomers, and have calculated their overall atmospheric lifetimes, which range between 22 and 38 h.http://www.atmos-chem-phys.net/11/6337/2011/acp-11-6337-2011.pdf |
| spellingShingle | P. B. Shepson P. V. Ramachandran B. A. Nault P. D. Gagare K. M. McAvey S. X. Ma J. D. Rindelaub <i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry Atmospheric Chemistry and Physics |
| title | <i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry |
| title_full | <i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry |
| title_fullStr | <i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry |
| title_full_unstemmed | <i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry |
| title_short | <i>α</i>-Pinene nitrates: synthesis, yields and atmospheric chemistry |
| title_sort | i α i pinene nitrates synthesis yields and atmospheric chemistry |
| url | http://www.atmos-chem-phys.net/11/6337/2011/acp-11-6337-2011.pdf |
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