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Organonitrate group concentrations in submicron particles with high nitrate and organic fractions in coastal southern California

Organonitrate group concentrations in submicron particles with high nitrate and organic fractions in coastal southern California,10.1016/j.atmosenv.20

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Organonitrate group concentrations in submicron particles with high nitrate and organic fractions in coastal southern California   (Citations: 2)
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During wintertime measurements in coastal southern California, organonitrate groups accounted for up to 10% of organic mass (OM) in submicron particles. In this study, we report the calibrated absorptivity, the uncertainties in the calibrations, the detection limits for 12 and 24 h ambient sampling, and the multipeak retrieval algorithm for the method developed. Organonitrate groups were observed when both submicron particle-phase nitrate and OM concentrations exceeded 1 μg m−3. These high concentrations were associated with a mixed urban fossil fuel combustion source type that had potential source regions near Riverside and the South Coast Air Basin. The high frequency of these organonitrate observations contrasts with a number of studies of aerosol particles in other regions with more humid conditions, in which organonitrate groups were not detected and submicron sulfate concentrations exceeded those of nitrate. Our results suggest both that organonitrates form and/or exist in significant concentrations during polluted urban conditions and that their lifetime may be limited by hydrolysis in the particle phase.
Journal: Atmospheric Environment - ATMOS ENVIRON , vol. 44, no. 16, pp. 1970-1979, 2010
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    • ...[30] Recent laboratory, observation, and modeling studies suggest that significant amounts of organonitrates (RONO2) are present in SOAs [Camredon et al., 2007; Ng et al., 2008; Fry et al., 2009; Lim and Ziemann, 2009; Matsunaga and Ziemann, 2009; Bruns et al., 2010; Farmer et al., 2010; Day et al., 2010], although the mechanisms of their formation and aging are poorly understood...

    Tomoki Nakayama, et al. Laboratory studies on optical properties of secondary organic aerosols...

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