Aerosol laser time-of-flight mass spectrometer for the on-line measurement of secondary organic aerosol in smog chamber |
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Affiliation: | 1. College of Chemistry & Environment, Minnan Normal University, Zhangzhou 363000, China;2. Department of Environmental Science and Engineering, Xiamen University, Tan Kah Kee College, Zhangzhou 363105, China;3. Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;1. Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, 1001 Ljubljana, Slovenia;2. Metrel d.d., Ljubljanska cesta 77, SI-1354 Horjul, Slovenia;1. Department of Electrical Engineering, University of Córdoba, Córdoba 14071, Spain;2. Department of Physics, University of Córdoba, Córdoba 14071, Spain |
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Abstract: | An aerosol laser time of flight mass spectrometer (ALTOFMS) that can be used for real-time measurement of the size and composition of individual aerosol particles has been designed and utilized to provide on-line measurement of secondary organic aerosol (SOA) particles resulted from Cl-initiated oxidation of toluene in smog chamber. Both the size and chemical compositions of individual aerosol particles were obtained in real-time. According to a large number of single aerosol diameters and mass spectra, the size distribution and chemical composition of aerosol were determined statistically. Experimental results indicate that aerosol particles produced from Cl-initiated oxidation of toluene were predominantly in the form of PM 2.5 particles, and nine positive laser desorption/ionization mass spectra peaks: m/z 18, 29, 30, 44, 46, 52, 65, 77, and 94 may come from the fragment ions of the products of the SOA: aromatic aldehydes, aromatic acids, phenolic compounds, and nitrogenated organic compounds. These results were in good agreement with those ones from previous Cl-initiated oxidation of toluene. These were demonstrated that ALTOFMS is a useful tool to reveal the formation and transformation processes of SOA particles in smog chamber. |
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Keywords: | Toluene Secondary organic aerosol (SOA) Laser desorption/ionization Aerosol laser time of flight mass spectrometer (ALTOFMS) Appearance probability |
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