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• W100548817 abstract "Organic compounds account for 20-90 % of the total fine particle mass concentration in a wide variety of atmospheric environments. Secondary organic aerosol (SOA) is formed from reactions of volatile organic compounds with hydroxyl radicals, ozone and nitrate radicals where the resultant low vapor pressure oxidation products partition between the gas and aerosol phase. Recent studies have shown that a substantial fraction of organic aerosol mass is composed of oligomers (Kalberer et al., 2004; Surratt et al., 2006). The heterogeneous reactions of relatively volatile carbonyls in the aerosol phase are estimated to have great importance on the formation of high molecular weight products via oligomerization. Several reactions have been postulated to contribute to the formation of high molecular weight compounds in SOA, including hemiacetal and acetal formation, condensation, peroxy-hemiacetal formation and esterification. Recently, various mass spectrometric methods for determination of organics in particles have been developed. At the PSI smog chamber joint experiments with such new instruments were performed. The goal of this effort was to test the potential of various mass spectrometric techniques for the investigation of the chemical composition of SOA and the formation of oligomers therein. The following instruments were involved: -Matrix-assisted laser desorption/ionization MS (MALDI-MS): SOA particles were sampled on impactor plates for 1-4 h. -TSI Single particle Aerosol Time of Flight Mass Spectrometer (ATOFMS, TSI 3800): Complete positive and negative ion mass spectra are generated on-line from single particles. -Aerodyne Aerosol Mass Spectrometer: An aerodynamic lens produces a collimated particle beam that impacts on a surface heated typically to 550C causing the particles to flash vaporize. The vapour plume is immediately ionised. -Proton-transfer-reaction MS (PTR-MS) and GCPTR-MS: The gas phase is stripped off by a charcoal denuder and the aerosols are thermally evaporated. Aerosol samples were also taken onto a cartridge and analysed on a GC-FID coupled to a PTR-MS. -Ion Chromatography-MS: The gas and particle phase were sampled with a wet effluent diffusion denuder/ aerosol collector (WEDD/AC). Detection was done with a conductivity detector and a single quadrupole mass detector (Dionex, MSQ TM ) in series. -FT-ICR-MS (Thermo Electron): Filter sampled SOA was extracted and electrosprayed into a high resolution, accurate mass LTQ-FT mass spectrometer and analyzed for high mass compounds. The formation of oligomers was shown by the on-and off-line mass spectrometric methods laser desorption/ionization MS (LDI-MS), ATOFMS and FT-ICR-MS. The high-mass ions occur with a characteristic spacing of 14 and 16 Da, indicative of oligomeric species. A comparison between the (matrix-assisted) laser desorption/ ionization mass spectra and those of the ATOFMS showed good agreement. A similar result was observed by comparing spectra from the FT-ICR-MS and MALDI-MS. Temporal trends of peak families and individual mass peaks were analyzed and compared. The lower mass species in the particles and the gas phase were investigated and compared using PTRMS and IC-MS." @default.
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• W100548817 date "2007-01-01" @default.
• W100548817 modified "2023-09-24" @default.
• W100548817 title "Examples of SOA analysis by mass spectrometry from the PSI smog chamber" @default.
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