Chemistry and Physics Faculty Articles
Title
Evidence for High Molecular Weight Nitrogen-Containing Organic Salts in Urban Aerosols
Document Type
Article
Publication Date
8-1-2005
Publication Title
Environmental Science & Technology
ISSN
0013-936X
Volume
44
Issue/No.
12
First Page
4441
Last Page
4446
Abstract
High molecular weight (Mw) 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-Mw species are potentially nitrogen-containing organic salts. Anti-correlation with the ambient O3 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-Mw 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-Mw species in regions where ammonia, amines, and carbonyls are prevalent.
NSUWorks Citation
Wang, X., Gao, S., Yang, X., Chen, H., Chen, J., Zhuang, G., Surratt, J. D., Chan, M. N., & Seinfeld, J. H. (2005). Evidence for High Molecular Weight Nitrogen-Containing Organic Salts in Urban Aerosols. Environmental Science & Technology, 44, (12), 4441 - 4446. https://doi.org/10.1021/es1001117. Retrieved from https://nsuworks.nova.edu/cnso_chemphys_facarticles/52
DOI
10.1021/es1001117
Comments
©2010 American Chemical Society