![]() ![]() No warranty is given about the accuracy of the copy. However, users may print, download, or email articles for individual use. Copyright of Atmosphere is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission.These results serve as experimental references for the study of the formation mechanism and optical properties of metallo-organic complexes in atmospheric aerosol particles in regions experiencing high levels of fine particles of metal and automobile exhaust pollution. These products have strong light absorption ability, resulting in an increase in the averaged mass absorption coefficient () in the 200~1000 nm range and the MAC at 365 nm (MAC365) for toluene SOA, while and MAC365 progressively increase with an increasing concentration of ferric chloride fine particles.Based on this spectral information, it is shown that gaseous methylcatechol formed from photooxidation of toluene may react with iron ion on the surface of fine particles by complexing and oxidationâreduction, resulting in methylbenzoquinone products and metallo-organic complex ions such as +, â and â. ![]() Compare with SOA formed in the absence of fine particles, the laser desorption/ionization mass spectra of toluene SOA generated in the presence of ferric chloride fine particles show ion peaks of m/z = 163 and 178, the UV-Vis spectra of the extracting solution for toluene SOA have peaks near 400 and 700 nm, and the electrospray ionization mass spectra contain peaks at m/z = 248 and 300. In the current study, the atmospheric photooxidation of toluene to produce SOA in the presence of ferric chloride fine particles is simulated in a smog chamber on-line and off-line mass spectrometry and spectroscopic instruments are used to characterize constituents and optics of SOA.
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