title: Evidence for high molecular weight nitrogen-containing organic salts in urban aerosols.
abstract: High molecular weight (M(w)) species were observed at substantial intensities in the positive-ion mass spectra in urban Shanghai aerosols collected from a single-particle time-of-flight mass spectrometer (in the m/z range 250-500) during three separate periods over 2007-2009. These species correlate well with the CN(-) mass signal, suggesting that C-N bonds are prevalent and that the observed high-M(w) species are potentially nitrogen-containing organic salts. Anti-correlation with the ambient O(3) concentration suggests that photochemical oxidants are not involved directly in the formation of these species. The Mannich reaction, among amines (or ammonia), formaldehyde, and carbonyls with an adjacent, acidic proton, is proposed as a plausible pathway leading to these organic salts. Although the high-M(w) species observed in the single-particle mass spectra appear to be nitrogen-containing organics, further chemical confirmation is desired to verify if the proposed Mannich reaction can explain the formation of these high-M(w) species in regions where ammonia, amines, and carbonyls are prevalent.
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai, 200433, China.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Wang
authors.forename: Song
authors.initials: S
authors.lastname: Gao
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
authors.forename: Jianmin
authors.initials: J
authors.lastname: Chen
authors.forename: Guoshun
authors.initials: G
authors.lastname: Zhuang
authors.forename: Jason D
authors.initials: JD
authors.lastname: Surratt
authors.forename: Man Nin
authors.initials: MN
authors.lastname: Chan
authors.forename: John H
authors.initials: JH
authors.lastname: Seinfeld
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D002947:Cities; D008970:Molecular Weight; D009584:Nitrogen / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry; D012492:Salts / Q000032:analysis* / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D000336:Aerosols; D009930:Organic Chemicals; D012492:Salts; D009584:Nitrogen