Online investigations on ozonation products of pyrene and benz[a]anthracene particles with a vacuum ultraviolet photoionization aerosol time-of-flight mass spectrometer |
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| Authors: | Shaokai Gao Yang Zhang Junwang Meng Jinian Shu |
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| Affiliation: | 1. SAS Institute Inc., Cary, NC, USA;2. North Carolina State University, Raleigh, NC, USA;1. Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan;2. Ishikawa Prefectural Institute of Public Health and Environmental Science, 1-11, Taiyogaoka, Kanazawa 920-1154, Japan;3. Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan;1. Environment Research Institute, Shandong University, Jinan 250100, China;2. School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;3. Jiangsu Collaborative Innovation Center for Climate Change, China;4. Institut de Combustion, Aerothermique, Reactivité Environnement (ICARE), CNRS/OSUC, 1C Avenue de la Recherche Scientifique, 45071 Orléans Cedex 02, France;5. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Fudan Tyndall Centre, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;6. Shandong Analysis and Test Center, Shandong Academy of Science, Jinan 250100, China |
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| Abstract: | The reaction products of ozone with pyrene and benz[a]anthracene absorbed on azelaic acid particles under the pseudo-first-order reaction conditions have been investigated with a vacuum ultraviolet photoionization aerosol time-of-flight mass spectrometer (VUV-ATOFMS). The pyrene and benz[a]anthracene particles with the initial concentrations of ～1 mg m?3 are respectively exposed to ～22 ppm ozone in a reaction chamber with a volume of ～180 L. The time-of-flight mass spectra of the particulate ozonides are obtained. The assignments of the mass spectra reveal that 4-carboxy-5-phenanthrene-carboxyaldehyde (71%) and hydroxypyrene (23%) are the main solid state ozonides of pyrene, while 2-(2-formyl)phenyl-3-naphthoic acid (35%), hydroxybenz[a]anthrone (30%), and benz[a]anthracene-7,12-dione (18%) are the main solid state ozonides of benz[a]anthracene. The pathways of the ozonations are proposed in the paper. |
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