Publication: Chemical oxidative potential of secondary organic aerosol (SOA) generated from the photooxidation of biogenic and anthropogenic volatile organic compounds
Publication - Chemical oxidative potential of secondary organic aerosol (SOA) generated from the photooxidation of biogenic and anthropogenic volatile organic compounds
Title:
Chemical oxidative potential of secondary organic aerosol (SOA) generated from the photooxidation of biogenic and anthropogenic volatile organic compounds
DOI:
10.5194/acp-17-839-2017
Publication Year:
2017
Author list:
Tuet, W. Y.
Journal Short Name:
Atmos. Chem. Phys.
Publisher:
Copernicus Publications
Abstract
Particulate matter (PM), of which a significant fraction is comprised of secondary organic aerosols (SOA), has received considerable attention due to its health implications. In this study, the water-soluble oxidative potential (OPWS) of SOA generated from the photooxidation of biogenic and anthropogenic hydrocarbon precursors (isoprene, a-pinene, b-caryophyllene, pentadecane, m-xylene, and naphthalene) under different reaction conditions (“RO2+HO2” vs. “RO2+NO” dominant, dry vs. humid) was characterized using dithiothreitol (DTT) consumption.The measured intrinsic OPWS-DTT values ranged from 9 to 205 pmol min-1 μg-1 and were highly dependent on the specific hydrocarbon precursor, with naphthalene and isoprene SOA generating the highest and lowest OPWS-DTT values, respectively. Humidity and RO2 fate affected OPWS-DTT in a hydrocarbon-specific manner, with naphthalene SOA exhibiting the most pronounced effects, likely due to the formation of nitroaromatics. Together, these results suggest that precursor identity may be more influential than reaction condition in determining SOA oxidative potential, demonstrating the importance of sources, such as incomplete combustion, to aerosol toxicity. In the context of other PM sources, all SOA systems, with the exception of naphthalene SOA, were less DTT active than ambient sources related to incomplete combustion, including diesel and gasoline combustion as well as biomass burning. Finally, naphthalene SOA was as DTT active as biomass burning aerosol, which was found to be the most DTT-active OA source in a previous ambient study. These results highlight a need to consider SOA contributions (particularly from anthropogenic hydrocarbons) to health effects in the context of hydrocarbon emissions, SOA yields, and other PM sources.Additional Notes
Experiments (18)
ID | Name | Start date | Experiment Category | Reaction Type | Reactant(s) | Oxidant Name | Temperature | Humidity | Type of Seed | RO2 Main Fate | Data Sets (count) | Actions |
---|---|---|---|---|---|---|---|---|---|---|---|---|
287 | Ng Research Group_20160325_ALPHA-PINENE_Hydroxyl radical_Ammonium sulfate_36%RH | 2016-03-25 | Aerosol formation | Photooxidation | ALPHA-PINENE | Hydroxyl radical | 24-27 | 40-32 | Ammonium sulfate | HO2 | 4 | Download |
286 | Ng Research Group_20160127_BETA-CARYOPHYLLENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-01-27 | Aerosol formation | Photooxidation | BETA-CARYOPHYLLENE | Hydroxyl radical | 24-27 | 1-4 | Ammonium sulfate | HO2 | 4 | Download |
288 | Ng Research Group_20160412_ALPHA-PINENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-04-12 | Aerosol formation | Photooxidation | ALPHA-PINENE | Hydroxyl radical | 24-27 | 1-10 | Ammonium sulfate | NO | 7 | Download |
289 | Ng Research Group_20160123_ALPHA-PINENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-01-23 | Aerosol formation | Photooxidation | ALPHA-PINENE | Hydroxyl radical | 24-27 | 1-4 | Ammonium sulfate | HO2 | 4 | Download |
290 | Ng Research Group_20160323_BETA-CARYOPHYLLENE_Hydroxyl radical_Ammonium sulfate_36%RH | 2016-03-23 | Aerosol formation | Photooxidation | BETA-CARYOPHYLLENE | Hydroxyl radical | 24-27 | 32-43 | Ammonium sulfate | HO2 | 4 | Download |
291 | Ng Research Group_20160416_BETA-CARYOPHYLLENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-04-16 | Aerosol formation | Photooxidation | BETA-CARYOPHYLLENE | Hydroxyl radical | 24-27 | 1-6 | Ammonium sulfate | NO | 7 | Download |
292 | Ng Research Group_20160331_ISOPRENE_Hydroxyl radical_1:2 MgSO4/H2SO4_dry | 2016-03-31 | Aerosol formation | Photooxidation | ISOPRENE | Hydroxyl radical | 24-27 | 7-12 | 1:2 MgSO4/H2SO4 | HO2 | 4 | Download |
293 | Ng Research Group_20160420_ISOPRENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-04-20 | Aerosol formation | Photooxidation | ISOPRENE | Hydroxyl radical | 24-27 | 1-10 | Ammonium sulfate | NO | 7 | Download |
294 | Ng Research Group_20160129_naphthalene_Hydroxyl radical_Ammonium sulfate_dry | 2016-01-29 | Aerosol formation | Photooxidation | naphthalene | Hydroxyl radical | 24-27 | 4-5 | Ammonium sulfate | HO2 | 3 | Download |
295 | Ng Research Group_20160329_naphthalene_Hydroxyl radical_Ammonium sulfate_39%RH | 2016-03-29 | Aerosol formation | Photooxidation | naphthalene | Hydroxyl radical | 24-27 | 32-46 | Ammonium sulfate | HO2 | 4 | Download |
296 | Ng Research Group_20160502_naphthalene_Hydroxyl radical_Ammonium sulfate_dry | 2016-05-02 | Aerosol formation | Photooxidation | naphthalene | Hydroxyl radical | 24-27 | 1-9 | Ammonium sulfate | NO | 7 | Download |
297 | Ng Research Group_20160321_M-XYLENE_Hydroxyl radical_Ammonium sulfate_36%RH | 2016-03-21 | Aerosol formation | Photooxidation | M-XYLENE | Hydroxyl radical | 24-27 | 26-46 | Ammonium sulfate | HO2 | 4 | Download |
298 | Ng Research Group_20160428_M-XYLENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-04-28 | Aerosol formation | Photooxidation | M-XYLENE | Hydroxyl radical | 24-27 | 1-8 | Ammonium sulfate | NO | 7 | Download |
299 | Ng Research Group_20160510_Pentadecane_Hydroxyl radical_Ammonium sulfate_dry | 2016-05-10 | Aerosol formation | Photooxidation | Pentadecane | Hydroxyl radical | 24-27 | 1-8 | Ammonium sulfate | NO | 7 | Download |
300 | Ng Research Group_20160130_ISOPRENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-01-30 | Aerosol formation | Photooxidation | ISOPRENE | Hydroxyl radical | 24-27 | 1-2 | Ammonium sulfate | HO2 | 3 | Download |
301 | Ng Research Group_20160126_M-XYLENE_Hydroxyl radical_Ammonium sulfate_dry | 2016-01-26 | Aerosol formation | Photooxidation | M-XYLENE | Hydroxyl radical | 24-27 | 1-2 | Ammonium sulfate | HO2 | 4 | Download |
302 | Ng Research Group_20160126_Pentadecane_Hydroxyl radical_Ammonium sulfate_dry | 2016-01-26 | Aerosol formation | Photooxidation | Pentadecane | Hydroxyl radical | 24-27 | 2-5 | Ammonium sulfate | HO2 | 4 | Download |
303 | Ng Research Group_20160324_Pentadecane_Hydroxyl radical_Ammonium sulfate_40%RH | 2016-03-24 | Aerosol formation | Photooxidation | Pentadecane | Hydroxyl radical | 24-27 | 35-45 | Ammonium sulfate | HO2 | 4 | Download |