@article{
 title = {Secondary organic aerosol formation from the β-pinene+NO<sub>3</sub> system: effect of humidity and peroxy radical fate},
 type = {article},
 year = {2015},
 identifiers = {[object Object]},
 pages = {7497-7522},
 volume = {15},
 websites = {http://www.atmos-chem-phys.net/15/7497/2015/},
 id = {db4f6976-2f3a-3597-9260-fd44a32c5d79},
 created = {2016-02-03T03:20:34.000Z},
 file_attached = {true},
 profile_id = {81af7548-db00-3f00-bfa0-1774347c59e1},
 group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},
 last_modified = {2016-02-09T19:57:29.000Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 abstract = {<p>The formation of secondary organic aerosol (SOA) from the oxidation of β-pinene via nitrate radicals is investigated in the Georgia Tech Environmental Chamber (GTEC) facility. Aerosol yields are determined for experiments performed under both dry (relative humidity (RH) < 2 %) and humid (RH = 50 % and RH = 70 %) conditions. To probe the effects of peroxy radical (RO<sub>2</sub>) fate on aerosol formation, "RO<sub>2</sub> + NO<sub>3</sub> dominant" and "RO<sub>2</sub> + HO<sub>2</sub> dominant" experiments are performed. Gas-phase organic nitrate species (with molecular weights of 215, 229, 231, and 245 amu, which likely correspond to molecular formulas of C<sub>10</sub>H<sub>17</sub>NO<sub>4</sub>, C<sub>10</sub>H<sub>15</sub>NO<sub>5</sub>, C<sub>10</sub>H<sub>17</sub>NO<sub>5</sub>, and C<sub>10</sub>H<sub>15</sub>NO<sub>6</sub>, respectively) are detected by chemical ionization mass spectrometry (CIMS) and their formation mechanisms are proposed. The NO<sup>+</sup> (at <i>m/z</i> 30) and NO<sub>2</sub><sup>+</sup> (at <i>m/z</i> 46) ions contribute about 11 % to the combined organics and nitrate signals in the typical aerosol mass spectrum, with the NO<sup>+</sup> : NO<sub>2</sub><sup>+</sup> ratio ranging from 4.8 to 10.2 in all experiments conducted. The SOA yields in the "RO<sub>2</sub> + NO<sub>3</sub> dominant" and "RO<sub>2</sub> + HO<sub>2</sub> dominant" experiments are comparable. For a wide range of organic mass loadings (5.1–216.1 μg m<sup>&minus;3</sup>), the aerosol mass yield is calculated to be 27.0–104.1 %. Although humidity does not appear to affect SOA yields, there is evidence of particle-phase hydrolysis of organic nitrates, which are estimated to compose 45–74 % of the organic aerosol. The extent of organic nitrate hydrolysis is significantly lower than that observed in previous studies on photooxidation of volatile organic compounds in the presence of NO<sub><i>x</sub></i>. It is estimated that about 90 and 10 % of the organic nitrates formed from the β-pinene+NO<sub>3</sub> reaction are primary organic nitrates and tertiary organic nitrates, respectively. While the primary organic nitrates do not appear to hydrolyze, the tertiary organic nitrates undergo hydrolysis with a lifetime of 3–4.5 h. Results from this laboratory chamber study provide the fundamental data to evaluate the contributions of monoterpene + NO<sub>3</sub> reaction to ambient organic aerosol measured in the southeastern United States, including the Southern Oxidant and Aerosol Study (SOAS) and the Southeastern Center for Air Pollution and Epidemiology (SCAPE) study.</p>},
 bibtype = {article},
 author = {Boyd, C. M. and Sanchez, J. and Xu, L. and Eugene, a. J. and Nah, T. and Tuet, W. Y. and Guzman, M. I. and Ng, N. L.},
 journal = {Atmospheric Chemistry and Physics},
 number = {13}
}

{"_id":"tv7ugw3Qs27S8Zymz","bibbaseid":"boyd-sanchez-xu-eugene-nah-tuet-guzman-ng-secondaryorganicaerosolformationfromthepinenenoltsubgt3ltsubgtsystemeffectofhumidityandperoxyradicalfate-2015","downloads":0,"creationDate":"2017-01-12T21:32:12.857Z","title":"Secondary organic aerosol formation from the β-pinene+NO&lt;sub&gt;3&lt;/sub&gt; system: effect of humidity and peroxy radical fate","author_short":["Boyd, C., M.","Sanchez, J.","Xu, L.","Eugene, a., J.","Nah, T.","Tuet, W., Y.","Guzman, M., I.","Ng, N., L."],"year":2015,"bibtype":"article","biburl":null,"bibdata":{"title":"Secondary organic aerosol formation from the β-pinene+NO&lt;sub&gt;3&lt;/sub&gt; system: effect of humidity and peroxy radical fate","type":"article","year":"2015","identifiers":"[object Object]","pages":"7497-7522","volume":"15","websites":"http://www.atmos-chem-phys.net/15/7497/2015/","id":"db4f6976-2f3a-3597-9260-fd44a32c5d79","created":"2016-02-03T03:20:34.000Z","file_attached":"true","profile_id":"81af7548-db00-3f00-bfa0-1774347c59e1","group_id":"63e349d6-2c70-3938-9e67-2f6483f6cbab","last_modified":"2016-02-09T19:57:29.000Z","read":false,"starred":false,"authored":false,"confirmed":"true","hidden":false,"abstract":"<p>The formation of secondary organic aerosol (SOA) from the oxidation of β-pinene via nitrate radicals is investigated in the Georgia Tech Environmental Chamber (GTEC) facility. Aerosol yields are determined for experiments performed under both dry (relative humidity (RH) < 2 %) and humid (RH = 50 % and RH = 70 %) conditions. To probe the effects of peroxy radical (RO₂) fate on aerosol formation, \"RO₂ + NO₃ dominant\" and \"RO₂ + HO₂ dominant\" experiments are performed. Gas-phase organic nitrate species (with molecular weights of 215, 229, 231, and 245 amu, which likely correspond to molecular formulas of C₁₀H₁₇NO₄, C₁₀H₁₅NO₅, C₁₀H₁₇NO₅, and C₁₀H₁₅NO₆, respectively) are detected by chemical ionization mass spectrometry (CIMS) and their formation mechanisms are proposed. The NO⁺ (at <i>m/z</i> 30) and NO₂⁺ (at <i>m/z</i> 46) ions contribute about 11 % to the combined organics and nitrate signals in the typical aerosol mass spectrum, with the NO⁺ : NO₂⁺ ratio ranging from 4.8 to 10.2 in all experiments conducted. The SOA yields in the \"RO₂ + NO₃ dominant\" and \"RO₂ + HO₂ dominant\" experiments are comparable. For a wide range of organic mass loadings (5.1–216.1 μg m^&minus;3), the aerosol mass yield is calculated to be 27.0–104.1 %. Although humidity does not appear to affect SOA yields, there is evidence of particle-phase hydrolysis of organic nitrates, which are estimated to compose 45–74 % of the organic aerosol. The extent of organic nitrate hydrolysis is significantly lower than that observed in previous studies on photooxidation of volatile organic compounds in the presence of NO_<i>x</i>. It is estimated that about 90 and 10 % of the organic nitrates formed from the β-pinene+NO₃ reaction are primary organic nitrates and tertiary organic nitrates, respectively. While the primary organic nitrates do not appear to hydrolyze, the tertiary organic nitrates undergo hydrolysis with a lifetime of 3–4.5 h. Results from this laboratory chamber study provide the fundamental data to evaluate the contributions of monoterpene + NO₃ reaction to ambient organic aerosol measured in the southeastern United States, including the Southern Oxidant and Aerosol Study (SOAS) and the Southeastern Center for Air Pollution and Epidemiology (SCAPE) study.</p>","bibtype":"article","author":"Boyd, C. M. and Sanchez, J. and Xu, L. and Eugene, a. J. and Nah, T. and Tuet, W. Y. and Guzman, M. I. and Ng, N. L.","journal":"Atmospheric Chemistry and Physics","number":"13","bibtex":"@article{\n title = {Secondary organic aerosol formation from the β-pinene+NO&lt;sub&gt;3&lt;/sub&gt; system: effect of humidity and peroxy radical fate},\n type = {article},\n year = {2015},\n identifiers = {[object Object]},\n pages = {7497-7522},\n volume = {15},\n websites = {http://www.atmos-chem-phys.net/15/7497/2015/},\n id = {db4f6976-2f3a-3597-9260-fd44a32c5d79},\n created = {2016-02-03T03:20:34.000Z},\n file_attached = {true},\n profile_id = {81af7548-db00-3f00-bfa0-1774347c59e1},\n group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},\n last_modified = {2016-02-09T19:57:29.000Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n abstract = {<p>The formation of secondary organic aerosol (SOA) from the oxidation of β-pinene via nitrate radicals is investigated in the Georgia Tech Environmental Chamber (GTEC) facility. Aerosol yields are determined for experiments performed under both dry (relative humidity (RH) < 2 %) and humid (RH = 50 % and RH = 70 %) conditions. To probe the effects of peroxy radical (RO₂) fate on aerosol formation, \"RO₂ + NO₃ dominant\" and \"RO₂ + HO₂ dominant\" experiments are performed. Gas-phase organic nitrate species (with molecular weights of 215, 229, 231, and 245 amu, which likely correspond to molecular formulas of C₁₀H₁₇NO₄, C₁₀H₁₅NO₅, C₁₀H₁₇NO₅, and C₁₀H₁₅NO₆, respectively) are detected by chemical ionization mass spectrometry (CIMS) and their formation mechanisms are proposed. The NO⁺ (at <i>m/z</i> 30) and NO₂⁺ (at <i>m/z</i> 46) ions contribute about 11 % to the combined organics and nitrate signals in the typical aerosol mass spectrum, with the NO⁺ : NO₂⁺ ratio ranging from 4.8 to 10.2 in all experiments conducted. The SOA yields in the \"RO₂ + NO₃ dominant\" and \"RO₂ + HO₂ dominant\" experiments are comparable. For a wide range of organic mass loadings (5.1–216.1 μg m^&minus;3), the aerosol mass yield is calculated to be 27.0–104.1 %. Although humidity does not appear to affect SOA yields, there is evidence of particle-phase hydrolysis of organic nitrates, which are estimated to compose 45–74 % of the organic aerosol. The extent of organic nitrate hydrolysis is significantly lower than that observed in previous studies on photooxidation of volatile organic compounds in the presence of NO_<i>x</i>. It is estimated that about 90 and 10 % of the organic nitrates formed from the β-pinene+NO₃ reaction are primary organic nitrates and tertiary organic nitrates, respectively. While the primary organic nitrates do not appear to hydrolyze, the tertiary organic nitrates undergo hydrolysis with a lifetime of 3–4.5 h. Results from this laboratory chamber study provide the fundamental data to evaluate the contributions of monoterpene + NO₃ reaction to ambient organic aerosol measured in the southeastern United States, including the Southern Oxidant and Aerosol Study (SOAS) and the Southeastern Center for Air Pollution and Epidemiology (SCAPE) study.</p>},\n bibtype = {article},\n author = {Boyd, C. M. and Sanchez, J. and Xu, L. and Eugene, a. J. and Nah, T. and Tuet, W. Y. and Guzman, M. I. and Ng, N. 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