Aqueous Photochemistry of Secondary Organic Aerosol of α-Pinene and α-Humulene Oxidized with Ozone, Hydroxyl Radical, and Nitrate Radical

2017 ◽  
Vol 121 (6) ◽  
pp. 1298-1309 ◽  
Author(s):  
Dian E. Romonosky ◽  
Ying Li ◽  
Manabu Shiraiwa ◽  
Alexander Laskin ◽  
Julia Laskin ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Nitrate Radical

scholarly journals Cloud condensation nuclei (CCN) activity of aliphatic amine secondary aerosol

2014 ◽  
Vol 14 (12) ◽  
pp. 5959-5967 ◽  
Author(s):  
X. Tang ◽  
D. Price ◽  
E. Praske ◽  
D. N. Vu ◽  
K. Purvis-Roberts ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Aliphatic Amine ◽  
Secondary Organic Aerosol ◽  
Cloud Condensation Nuclei ◽  
Organic Aerosol ◽  
Nitrate Radical ◽  
Condensation Nuclei ◽  
Primary Aliphatic Amine ◽  
Secondary Aerosol ◽  
Ccn Activity

Abstract. Aliphatic amines can form secondary aerosol via oxidation with atmospheric radicals (e.g., hydroxyl radical and nitrate radical). The particle can contain both secondary organic aerosol (SOA) and inorganic salts. The ratio of organic to inorganic materials in the particulate phase influences aerosol hygroscopicity and cloud condensation nuclei (CCN) activity. SOA formed from trimethylamine (TMA) and butylamine (BA) reactions with hydroxyl radical (OH) is composed of organic material of low hygroscopicity (single hygroscopicity parameter, κ, ≤ 0.25). Secondary aerosol formed from the tertiary aliphatic amine (TMA) with N2O5 (source of nitrate radical, NO3) contains less volatile compounds than the primary aliphatic amine (BA) aerosol. As relative humidity (RH) increases, inorganic amine salts are formed as a result of acid–base reactions. The CCN activity of the humid TMA–N2O5 aerosol obeys Zdanovskii, Stokes, and Robinson (ZSR) ideal mixing rules. The humid BA + N2O5 aerosol products were found to be very sensitive to the temperature at which the measurements were made within the streamwise continuous-flow thermal gradient CCN counter; κ ranges from 0.4 to 0.7 dependent on the instrument supersaturation (ss) settings. The variance of the measured aerosol κ values indicates that simple ZSR rules cannot be applied to the CCN results from the primary aliphatic amine system. Overall, aliphatic amine aerosol systems' κ ranges within 0.2 < κ < 0.7. This work indicates that aerosols formed via nighttime reactions with amines are likely to produce hygroscopic and volatile aerosol, whereas photochemical reactions with OH produce secondary organic aerosol of lower CCN activity. The contributions of semivolatile secondary organic and inorganic material from aliphatic amines must be considered for accurate hygroscopicity and CCN predictions from aliphatic amine systems.

scholarly journals Nitrate radical, ozone and hydroxyl radical initiated aging of limonene secondary organic aerosol

2021 ◽  
Vol 9 ◽  
pp. 100102
Author(s):  
Sathiyamurthi Ramasamy ◽  
Tomoki Nakayama ◽  
Yu Morino ◽  
Takashi Imamura ◽  
Yoshizumi Kajii ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Nitrate Radical

scholarly journals Secondary organic aerosol formation from reaction of tertiary amines with nitrate radical

2008 ◽  
Vol 8 (4) ◽  
pp. 16585-16608 ◽  
Author(s):  
M. E. Erupe ◽  
D. J. Price ◽  
P. J. Silva ◽  
Q. G. J. Malloy ◽  
L. Qi ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Nitrate Radical ◽  
Tertiary Amines ◽  
Aerosol Formation ◽  
Night Time ◽  
Aerosol Mass Spectrometer ◽  
Aerosol Mass ◽  
Secondary Organic Aerosol Formation

Abstract. Secondary organic aerosol formation from the reaction of tertiary amines with nitrate radical was investigated in an indoor environmental chamber. Particle chemistry was monitored using a high resolution aerosol mass spectrometer while gas-phase species were detected using a proton transfer reaction mass spectrometer. Trimethylamine, triethylamine and tributylamine were studied. Results indicate that tributylamine forms the most aerosol mass followed by trimethylamine and triethylamine respectively. Spectra from the aerosol mass spectrometer indicate the formation of complex non-salt aerosol products. We propose a reaction mechanism that proceeds via abstraction of a proton by nitrate radical followed by RO2 chemistry. Rearrangement of the aminyl alkoxy radical through hydrogen shift leads to the formation of hydroxylated amides, which explain most of the higher mass ions in the mass spectra. These experiments show that oxidation of tertiary amines by nitrate radical may be an important night-time source of secondary organic aerosol.

New insights into secondary organic aerosol from nitrate oxidation of isoprene in the atmospheric simulation chamber SAPHIR

2020 ◽  
Author(s):  
Juliane L. Fry ◽  
Bellamy Brownwood ◽  
Thorsten Hohaus ◽  
Avtandil Turdziladze ◽  
Philip Carlsson ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Organic Nitrate ◽  
Nitrate Radical ◽  
Peroxy Radicals ◽  
Radical Reactivity ◽  
No3 Radical ◽  
Chemical Conditions ◽  
Seed Aerosol ◽  
Simulation Chamber

&lt;p&gt;Experiments at a set of atmospherically relevant conditions were performed in the atmospheric simulation chamber SAPHIR, investigating the oxidation of isoprene by the nitrate radical (NO3). A comprehensive set of instruments detected trace gases, radicals, aerosol properties and hydroxyl (OH) and NO3 radical reactivity. The chemical conditions in the chamber were varied to change the fate of the peroxy radicals (RO2) formed after the reaction between NO3 and isoprene, and seed aerosol of varying composition was added to initiate gas/aerosol partitioning. This presentation discusses observed gas/aerosol partitioning of the major organic nitrate products and summarizes the observations of secondary organic aerosol yield.&lt;/p&gt;

Trimethylamine as Precursor to Secondary Organic Aerosol Formation via Nitrate Radical Reaction in the Atmosphere

2008 ◽  
Vol 42 (13) ◽  
pp. 4689-4696 ◽  
Author(s):  
Philip J. Silva ◽  
Mark E. Erupe ◽  
Derek Price ◽  
John Elias ◽  
Quentin G. J. Malloy ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Radical Reaction ◽  
Organic Aerosol ◽  
Nitrate Radical ◽  
Aerosol Formation ◽  
Secondary Organic Aerosol Formation

scholarly journals Substantial secondary organic aerosol formation in a coniferous forest: observations of both day and night time chemistry

2015 ◽  
Vol 15 (20) ◽  
pp. 28005-28035 ◽  
Author(s):  
A. K. Y. Lee ◽  
J. P. D. Abbatt ◽  
W. R. Leaitch ◽  
S.-M. Li ◽  
S. J. Sjostedt ◽  
...  
Keyword(s):  
Gas Phase ◽  
Secondary Organic Aerosol ◽  
Coniferous Forest ◽  
Organic Aerosol ◽  
Organic Nitrates ◽  
Nitrate Radical ◽  
Aerosol Formation ◽  
Radical Chemistry ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

Abstract. Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region at Whistler, British Columbia. A largely biogenic aerosol growth episode was observed, providing a unique opportunity to investigate BSOA formation chemistry in a forested environment with limited influence from anthropogenic emissions. Positive matrix factorization of aerosol mass spectrometry (AMS) measurement identified two types of BSOA (BSOA-1 and BSOA-2), which were primarily generated by gas-phase oxidation of monoterpenes and perhaps sesquiterpenes. The temporal variations of BSOA-1 and BSOA-2 can be explained by gas-particle partitioning in response to ambient temperature and the relative importance of different oxidation mechanisms between day and night. While BSOA-1 will arise from gas-phase ozonolysis and nitrate radical chemistry at night, BSOA-2 is less volatile than BSOA-1 and consists of products formed via gas-phase oxidation by the OH radical and ozone during the day. Organic nitrates produced through nitrate radical chemistry can account for 22–33 % of BSOA-1 mass at night. The mass spectra of BSOA-1 and BSOA-2 have higher values of the mass fraction of m/z 91 (f91) compared to the background organic aerosol, and so f91 is used as an indicator of BSOA formation pathways. A comparison between laboratory studies in the literature and our field observations highlights the potential importance of gas-phase formation chemistry of BSOA-2 type materials that may not be captured in smog chamber experiments, perhaps due to the wall loss of gas-phase intermediate products.

Aqueous benzene-diols react with an organic triplet excited state and hydroxyl radical to form secondary organic aerosol

2015 ◽  
Vol 17 (15) ◽  
pp. 10227-10237 ◽  
Author(s):  
Jeremy D. Smith ◽  
Haley Kinney ◽  
Cort Anastasio
Keyword(s):  
Excited State ◽  
Hydroxyl Radical ◽  
Aqueous Phase ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Triplet Excited State

Benzene-diols are oxidized rapidly by hydroxyl radical and the triplet excited state of an aromatic carbonyl to efficiently form SOA in the aqueous phase.

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