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Measurements of secondary organic aerosol formed from OH-initiated photo-oxidation of isoprene using online photoionization aerosol mass spectrometry.
Environ Sci Technol. 2012 Apr 03; 46(7):3898-904.ES

Abstract

Isoprene is a significant source of atmospheric organic aerosol; however, the secondary organic aerosol (SOA) formation and involved chemical reaction pathways have remained to be elucidated. Recent works have shown that the photo-oxidation of isoprene leads to form SOA. In this study, the chemical composition of SOA from the OH-initiated photo-oxidation of isoprene, in the absence of seed aerosols, was investigated through the controlled laboratory chamber experiments. Thermal desorption/tunable vacuum-ultraviolet photoionization time-of-flight aerosol mass spectrometry (TD-VUV-TOF-PIAMS) was used in conjunction with the environmental chamber to study SOA formation. The mass spectra obtained at different photon energies and the photoionization efficiency (PIE) spectra of the SOA products can be obtained in real time. Aided by the ionization energies (IE) either from the ab initio calculations or the literatures, a number of SOA products were proposed. In addition to methacrolein, methyl vinyl ketone, and 3-methyl-furan, carbonyls, hydroxycarbonyls, nitrates, hydroxynitrates, and other oxygenated compounds in SOA formed in laboratory photo-oxiadation experiments were identified, some of them were investigated for the first time. Detailed chemical identification of SOA is crucial for understanding the photo-oxidation mechanisms of VOCs and the eventual formation of SOA. Possible reaction mechanisms will be discussed.

Authors+Show Affiliations

National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China. fangwz@mail.ustc.edu.cnNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22397593

Citation

Fang, Wenzheng, et al. "Measurements of Secondary Organic Aerosol Formed From OH-initiated Photo-oxidation of Isoprene Using Online Photoionization Aerosol Mass Spectrometry." Environmental Science & Technology, vol. 46, no. 7, 2012, pp. 3898-904.
Fang W, Gong L, Zhang Q, et al. Measurements of secondary organic aerosol formed from OH-initiated photo-oxidation of isoprene using online photoionization aerosol mass spectrometry. Environ Sci Technol. 2012;46(7):3898-904.
Fang, W., Gong, L., Zhang, Q., Cao, M., Li, Y., & Sheng, L. (2012). Measurements of secondary organic aerosol formed from OH-initiated photo-oxidation of isoprene using online photoionization aerosol mass spectrometry. Environmental Science & Technology, 46(7), 3898-904. https://doi.org/10.1021/es204669d
Fang W, et al. Measurements of Secondary Organic Aerosol Formed From OH-initiated Photo-oxidation of Isoprene Using Online Photoionization Aerosol Mass Spectrometry. Environ Sci Technol. 2012 Apr 3;46(7):3898-904. PubMed PMID: 22397593.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Measurements of secondary organic aerosol formed from OH-initiated photo-oxidation of isoprene using online photoionization aerosol mass spectrometry. AU - Fang,Wenzheng, AU - Gong,Lei, AU - Zhang,Qiang, AU - Cao,Maoqi, AU - Li,Yuquan, AU - Sheng,Liusi, Y1 - 2012/03/19/ PY - 2012/3/9/entrez PY - 2012/3/9/pubmed PY - 2012/9/14/medline SP - 3898 EP - 904 JF - Environmental science & technology JO - Environ Sci Technol VL - 46 IS - 7 N2 - Isoprene is a significant source of atmospheric organic aerosol; however, the secondary organic aerosol (SOA) formation and involved chemical reaction pathways have remained to be elucidated. Recent works have shown that the photo-oxidation of isoprene leads to form SOA. In this study, the chemical composition of SOA from the OH-initiated photo-oxidation of isoprene, in the absence of seed aerosols, was investigated through the controlled laboratory chamber experiments. Thermal desorption/tunable vacuum-ultraviolet photoionization time-of-flight aerosol mass spectrometry (TD-VUV-TOF-PIAMS) was used in conjunction with the environmental chamber to study SOA formation. The mass spectra obtained at different photon energies and the photoionization efficiency (PIE) spectra of the SOA products can be obtained in real time. Aided by the ionization energies (IE) either from the ab initio calculations or the literatures, a number of SOA products were proposed. In addition to methacrolein, methyl vinyl ketone, and 3-methyl-furan, carbonyls, hydroxycarbonyls, nitrates, hydroxynitrates, and other oxygenated compounds in SOA formed in laboratory photo-oxiadation experiments were identified, some of them were investigated for the first time. Detailed chemical identification of SOA is crucial for understanding the photo-oxidation mechanisms of VOCs and the eventual formation of SOA. Possible reaction mechanisms will be discussed. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/22397593/Measurements_of_secondary_organic_aerosol_formed_from_OH_initiated_photo_oxidation_of_isoprene_using_online_photoionization_aerosol_mass_spectrometry_ L2 - https://doi.org/10.1021/es204669d DB - PRIME DP - Unbound Medicine ER -