Particulate matter is a complex mixture of primary and secondary particles originating from anthropogenic and biogenic emissions. Water soluble organic compounds (WSOC) account from 30 to 90% of the organic content of aerosols. 1H-NMR spectroscopy is an emerging method used to characterize environmental exposures to specific types of organic compounds. Up-to-date, WSOC have been characterized by 1H-NMR from aerosols water extracts mainly in continental aerosols originating from biomass burning or traffic (urban area) and in marine aerosols. We applied 1H-NMR to water extracts of two sets of samples collected with a 5-stage cascade impactor using different size intervals: <0.49, 0.49-.96, 0.96-1.5, 1.5-3.0, 3.0-7.2 and 7.2-30 �m in winter and spring.  In this paper we will discuss the functional group composition and carbon content of size-segregated aerosols, and the size distribution of biogenic and anthropogenic organic markers. Distinct spectrometric patterns were observed for different particle sizes reflecting the possible contribution of aerosols sources in each fraction. Particles concentration varied from 1.3 �g/m3 in the 3.0-1.5 �m size range to 14.0 �g/m3 in the <0.49 �m particles. WSOC carbon concentration ranged from 7 ng/m3 in the 7.2-3.0 �m size range to 38 ng/m3in the 0.96-0.49 �m size range.

<sup>1</sup>H-NMR characterization of water soluble compounds in size-segregated aerosols in an urban area

247th National Meeting (2014)

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1H-NMR characterization of water soluble compounds in size-segregated aerosols in an urban area

¹H-NMR characterization of water soluble compounds in size-segregated aerosols in an urban area