Mass spectrometric study of secondary organic aerosol formed from the photo-oxidation of aromatic hydrocarbons

Sato, Kei; Takami, Akinori; Isozaki, Tasuku; Hikida, Toshihide; Shimono, Atsushi; Igarashi, Takashi

doi:10.1016/j.atmosenv.2009.12.013

Cited by 103 publications

(113 citation statements)

References 51 publications

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“…The SOA densities were observed to be initially high (∼1.8 g cm −3 ), which could be due to high density of nucleating species. The final SOA densities were in the range of 1.3-1.4 g cm −3 , in reasonable agreement with previous studies (Ng et al, 2007;Sato et al, 2010). Although Bahreini et al (2005) observed weak correlation between effective density and relative contribution of m/z 44 signal to total organic signal of AMS, the final SOA densities were found to be independent of elemental composition of SOA from aromatics tested in this study (Fig.…”

Section: Soa Elemental Ratio and Densitysupporting

confidence: 81%

Secondary organic aerosol formation from phenolic compounds in the absence of NOx

et al. 2011

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Abstract. SOA formation from benzene, toluene, m-xylene, and their corresponding phenolic compounds were investigated using the UCR/CE-CERT Environmental Chamber to evaluate the importance of phenolic compounds as intermediate species in aromatic SOA formation. SOA formation yield measurements coupled to gas-phase yield measurements indicate that approximately 20 % of the SOA of benzene, toluene, and m-xylene could be ascribed to the phenolic route under low NO x conditions. The SOA densities tend to be initially as high as approximately 1.8 g cm −3 and eventually reach the range of 1.3-1.4 g cm −3 . The final SOA density was found to be independent of elemental ratio (O/C) indicating that applying constant density (e.g., 1.4 g cm −3 ) to SOA formed from different aromatic compounds tested in this study is a reasonable approximation. Results from a novel on-line PILS-TOFMS (Particle-into-Liquid Sampler coupled with Agilent Time-of-Flight Mass Spectrometer) are reported. Major signals observed by the on-line/off-line Agilent TOFMS indicated that products had the same number of carbon atoms as their parent aromatics, suggesting importance of ring-retaining products or ring-opening products following ring-cleavage.

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Section: Soa Elemental Ratio and Densitysupporting

confidence: 81%

Secondary organic aerosol formation from phenolic compounds in the absence of NOx

et al. 2011

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“…In both systems, the fraction of CO 2 + increases with continued irradiation with f 44 ranging from 10-13% for toluene SOA and 8-10% for m-xylene SOA. These ranges of f 44 values were also observed by Sato et al (2010).…”

Section: Single-ring Aromatic Soasupporting

confidence: 69%

Elemental analysis of chamber organic aerosol using an aerodyne high-resolution aerosol mass spectrometer

2010

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Abstract. The elemental composition of laboratory chamber secondary organic aerosol (SOA) from glyoxal uptake, α-pinene ozonolysis, isoprene photooxidation, single-ring aromatic photooxidation, and naphthalene photooxidation is evaluated using Aerodyne high-resolution time-of-flight mass spectrometer data. SOA O/C ratios range from 1.13 for glyoxal uptake experiments to 0.30-0.43 for α-pinene ozonolysis. The elemental composition of α-pinene and naphthalene SOA is also confirmed by offline mass spectrometry. The fraction of organic signal at m/z 44 is generally a good measure of SOA oxygenation for α-pinene/O 3 , isoprene/high-NO x , and naphthalene SOA systems. The agreement between measured and estimated O/C ratios tends to get closer as the fraction of organic signal at m/z 44 increases. This is in contrast to the glyoxal uptake system, in which m/z 44 substantially underpredicts O/C. Although chamber SOA has generally been considered less oxygenated than ambient SOA, single-ring aromatic-and naphthalenederived SOA can reach O/C ratios upward of 0.7, well within the range of ambient PMF component OOA, though still not as high as some ambient measurements. The spectra of aromatic and isoprene-high-NO x SOA resemble that of OOA, but the spectrum of glyoxal uptake does not resemble that of any ambient organic aerosol PMF component.

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“…We checked HNO 3 condensation by the ToF-AMS signal ratio of m/z 30 to m/z 46. This ratio is 3-5 for organic nitrates and <3 for inorganic nitrates (Rollins et al, 2009;Sato et al, 2010). The m/z 30 to m/z 46 ratio at 300 K (EPA1078W) was 4.7 ± 1.2, whereas that at 278 K (EPA1148W) was 4.7 ± 0.6, indicating HNO 3 is a minor particulate component both at 278 and 300 K.…”

Section: Temperature Dependencementioning

confidence: 95%

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NOx conditions

et al. 2011

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Abstract. Secondary organic aerosol (SOA) formation from atmospheric oxidation of isoprene has been the subject of multiple studies in recent years; however, reactions of other conjugated dienes emitted from anthropogenic sources remain poorly understood. SOA formation from the photooxidation of isoprene, isoprene-1-13 C, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene is investigated for high NO x conditions. The SOA yield measured in the 1,3-butadiene/NO x /H 2 O 2 irradiation system (0.089-0.178) was close to or slightly higher than that measured with isoprene under similar NO x conditions (0.077-0.103), suggesting that the photooxidation of 1,3-butadiene is a possible source of SOA in urban air. In contrast, a very small amount of SOA particles was produced in experiments with 2,3-dimethyl-1,3-butadiene. Off-line liquid chromatography -mass spectrometry analysis revealed that the signals of oligoesters comprise a major fraction (0.10-0.33) of the signals of the SOA products observed from all dienes investigated. The oligoesters originate from the unsaturated aldehyde gas phase diene reaction products; namely, semi-volatile compounds produced by the oxidation of the unsaturated aldehyde undergo particle-phase oligoester formation. Oligoesters produced by the dehydration reaction between nitrooxypolyol and 2-methylglyceric acid monomer or its oligomer were also characterized in these experiments with isoprene as the Correspondence to: D. R. Cocker III (dcocker@engr.ucr.edu) starting diene. These oligomers are possible sources of the 2-methyltetrols found in ambient aerosol samples collected under high NO x conditions. Furthermore, in low-temperature experiments also conducted in this study, the SOA yield measured with isoprene at 278 K was 2-3 times as high as that measured at 300 K under similar concentration conditions. Although oligomerization plays an important role in SOA formation from isoprene photooxidation, the observed temperature dependence of SOA yield is largely explained by gas/particle partitioning of semi-volatile compounds.

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Mass spectrometric study of secondary organic aerosol formed from the photo-oxidation of aromatic hydrocarbons

Cited by 103 publications

References 51 publications

Secondary organic aerosol formation from phenolic compounds in the absence of NO<sub>x</sub>

Secondary organic aerosol formation from phenolic compounds in the absence of NO<sub>x</sub>

Elemental analysis of chamber organic aerosol using an aerodyne high-resolution aerosol mass spectrometer

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO<sub>x</sub> conditions

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Mass spectrometric study of secondary organic aerosol formed from the photo-oxidation of aromatic hydrocarbons

Cited by 103 publications

References 51 publications

Secondary organic aerosol formation from phenolic compounds in the absence of NO&lt;sub&gt;x&lt;/sub&gt;

Secondary organic aerosol formation from phenolic compounds in the absence of NO&lt;sub&gt;x&lt;/sub&gt;

Elemental analysis of chamber organic aerosol using an aerodyne high-resolution aerosol mass spectrometer

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO&lt;sub&gt;x&lt;/sub&gt; conditions

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Secondary organic aerosol formation from phenolic compounds in the absence of NO<sub>x</sub>

Secondary organic aerosol formation from phenolic compounds in the absence of NO<sub>x</sub>

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO<sub>x</sub> conditions