Effects of inorganic seed aerosols on the growth and chemical composition of secondary organic aerosol formed from OH-initiated oxidation of toluene

Huang, Mingqiang; Hao, Liqing; Gu, Xuejun; Hu, Changjin; Zhao, Weixiong; Wang, Zhenya; Li, Fang; Zhang, Weijun

doi:10.1007/s10874-013-9262-9

Cited by 26 publications

(36 citation statements)

References 36 publications

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“…However, NO x concentration in the seeded experiments was remarkably higher than in the unseeded (j NO 2 = 0.28 min −1 ) experiments, and NO x is known to suppress SOA formation . Huang et al (2013) obtained a SOA yield of approximately 0.1 when no seed particles were present and 0.2-0.4 when seed particles were present, depending on the seed particle material. It must be noted that Ng et al, 2007;Kroll et al (2007) and Huang et al (2013) carried out their experiments in dry conditions (RH 4-7 % or 15 %), while in our experiments RH was 54-79 %.…”

Section: Soa Formation Experimentsmentioning

confidence: 99%

“…Huang et al (2013) obtained a SOA yield of approximately 0.1 when no seed particles were present and 0.2-0.4 when seed particles were present, depending on the seed particle material. It must be noted that Ng et al, 2007;Kroll et al (2007) and Huang et al (2013) carried out their experiments in dry conditions (RH 4-7 % or 15 %), while in our experiments RH was 54-79 %. This may have enhanced the SOA yields, because a higher humidity is known to increase the SOA yield remarkably (Zhou et al, 2011;Keller and Burtscher, 2012).…”

Section: Soa Formation Experimentsmentioning

confidence: 99%

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Characterization and testing of a new environmental chamber

et al. 2015

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Abstract. A 29 m 3 Teflon chamber, designed for studies on the aging of combustion aerosols, at the University of Eastern Finland is described and characterized. The chamber is part of a research facility, called Ilmari, where small-scale combustion devices, a dynamometer for vehicle exhaust studies, dilution systems, the chamber, and cell and animal exposure devices are located side by side under the same roof. The small surface-to-volume ratio of the chamber enables reasonably long experiment times, with particle wall loss rate constants of 0.088, 0.080, 0.045, and 0.040 h −1 for polydisperse, 50, 100, and 200 nm monodisperse aerosols, respectively. The NO 2 photolysis rate can be adjusted from 0 to 0.62 min −1 . The irradiance spectrum is centered at either 350 or 365 nm, and the maximum irradiance, produced by up to 160 blacklight lamps, is 29.7 W m −2 , which corresponds to the ultraviolet (UV) irradiance in Central Finland at noon on a sunny day in the midsummer. The temperature inside the chamber is uniform and can be kept at 25 ± 1 • C. The chamber is kept in an overpressure with a moving top frame, which reduces sample dilution and entrance of contamination during an experiment. The functionality of the chamber was tested with oxidation experiments of toluene, resulting in secondary organic aerosol (SOA) yields of 12-42 %, depending on the initial conditions, such as NO x concentration and UV irradiation. The highest gaseous oxidation product yields of 12.4-19.5 % and 5.8-19.5 % were detected with ions corresponding to methyl glyoxal (m/z 73.029) and 4-oxo-2-pentenal (m/z 99.044), respectively. Overall, reasonable yields of SOA and gaseous reaction products, comparable to those obtained in other laboratories, were obtained.

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Section: Soa Formation Experimentsmentioning

confidence: 99%

Section: Soa Formation Experimentsmentioning

confidence: 99%

Characterization and testing of a new environmental chamber

et al. 2015

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“…Our group has used scanning mobility particle sizer and ALTOFMS to study the effects of inorganic seed aerosols on the growth and chemical composition of SOA formed from OH-initiated oxidation of toluene. Our results revealed that inorganic seed aerosols would promote growth rates of SOA formation at the start of the reaction and inhibits its formation rate with prolonging the reaction time, while the products of SOA is affected by inorganic seed aerosol through multiphase reaction (Huang et al 2013a). Recently, Fuzzy C-Means (FCM) algorithm has been developed by our group to classify the mass spectra of large numbers of particles obtained by ALTOFMS (Huang et al 2013b).…”

Section: Introductionmentioning

confidence: 96%

Mass spectrometric study of aged benzene secondary organic aerosol in the presence of dry ammonium sulfate

et al. 2016

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Inorganic seed particles have relatively large surface area, and play an important role in the formation and aging of secondary organic aerosol (SOA). The effects of dry (NH 4 ) 2 SO 4 which is the most commonly found in urban atmosphere on the aged benzene SOA were qualitatively studied utilizing aerosol laser time-of-flight mass spectrometer (ALTOFMS) coupled with Fuzzy C-Means (FCM) clustering algorithm in this study. Experimental results indicated that nitrophenol, oxocarboxylic acid, epoxide products are the predominant components in the aged benzene SOA in the presence of low concentration (about 10 μg m −3 ) of dry (NH 4 ) 2 SO 4 . These aged products are the same as the previously obtained aged benzene SOA without (NH 4 ) 2 SO 4 seed aerosol, indicating that low concentration of dry (NH 4 ) 2 SO 4 acts just as the nucleation or condensation center of the SOA, and do not affect the chemical composition of SOA. However, 1 H-imidazole, 1 H-imidazole-2-carbaldehyde, hydrated 1 H-imidazole-2-carbaldehyde, 2,2′-biimidazole, hydrated N-glyoxal substituted 1 H-imidazole, N-glyoxal substituted hydrated 1 H-imidazole-2-carbaldehyde, hydrated mono glyoxal substituted hydrated 1 H-imidazole-2-carboxaldehyde, mono glyoxal substituted 2,2-biimidazole and hydrated glyoxal dimer substituted imidazole which are formed from ammonium ion reaction with glyoxal are the major particulate products in the aged benzene SOA in the presence of high concentration J Atmos Chem (about 100 μg m −3 ) of dry (NH 4 ) 2 SO 4 . The retention of water on the dry (NH 4 ) 2 SO 4 particles creates ammonium ion, which can promote the formation of high-molecular-weight (HMW) products through multiphase reactions such as hydration and polymerization of aldehydes form from OH-initiated oxidation of benzene.

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“…The mass spectra of these 10 clusters are different from those observed in our previously aged 135-TMB SOA study without seed aerosol [26], indicating that new particulate products were formed. The first class I has the only peak of m/z 18, which is representative of ammonium ion (NH 4 + ) [32,33]. The patterns of classes II and III resemble the mass spectra of methylglyxoal and 2-methyl-4-oxo-2-pentenal, which were detected in our previous photooxidation experiment of 135-TMB [26].…”

Section: Resultsmentioning

confidence: 54%

“…The time series of the 135-TMB, NO x , O 3 , and SOA concentrations that were corrected for wall loss [32] are displayed in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Mass Spectral Analysis of the Aged 1,3,5-Trimethylbenzene Secondary Organic Aerosol in the Presence of Ammonium Sulfate Seeds

Huang

Cai

et al. 2017

Pol. J. Environ. Stud.

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The ammonium sulfate ((NH 4 ) 2 SO 4 ) seed aerosols commonly found in the Chinese urban atmosphere could affect the formation and aging of secondary organic aerosols (SOA). Aging of aromatic SOA is performed using UV-irradiation of 1,3,5-trimethylbenzene (135-TMB)/CH 3 ONO/NO/air mixtures with high concentrations (~100 μg/m 3 ) of (NH 4 ) 2 SO 4 seeds in the laboratory chamber in this study. The particulate products of SOA were measured using an aerosol laser time-of-flight mass spectrometer (ALTOFMS) in real-time, and fuzzy c-means (FCM) was applied to the mass spectra organic species for clusters. Experimental results indicated that methylglyxoal, 2-methyl-4-oxo-2-pentenal, 4-methyl-1H-imidazole, 4-methyl-imidazole-2-acetaldehyde, and other imidazole derivative compounds are the principal products in the aged particles. Imidazole compounds that can absorb solar radiation effectively were newly detected in the aged 135-TMB SOA with high concentrations of (NH 4 ) 2 SO 4 seed aerosols. These would provide new information for discussing the 135-TMB SOA aging mechanism.

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Effects of inorganic seed aerosols on the growth and chemical composition of secondary organic aerosol formed from OH-initiated oxidation of toluene

Cited by 26 publications

References 36 publications

Characterization and testing of a new environmental chamber

Characterization and testing of a new environmental chamber

Mass spectrometric study of aged benzene secondary organic aerosol in the presence of dry ammonium sulfate

Mass Spectral Analysis of the Aged 1,3,5-Trimethylbenzene Secondary Organic Aerosol in the Presence of Ammonium Sulfate Seeds

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