Secondary organic aerosol production from terpene ozonolysis. 2. Effect of NOx concentration. Presto, A., A., Hartz, K., E., H., & Donahue, N., M. Environ. Sci. Technol., 39:7046-7054, 2005.
abstract   bibtex   
We report secondary organic aerosol (SOA) yields from the ozonolysis of alpha-pinene in the presence of NO and NO2. Experimental conditions are characterized by the [VOC](0)/ [NOx](0) ratio (ppbC/ppb), which varies from similar to 1 to similar to 300. SOA yield is constant for [VOC](0)/[NOx](0) > similar to 15 and decreases dramatically (by more than a factor of 4) as [VOC](0)/[NOx](0) decreases. Aerosol production is completely suppressed in the presence of NO for [VOC](0)/[NOx](0) <= 4.5. Fourier transform IR analysis of filter samples reveals that nitrate-containing species contribute significantly to the total aerosol mass at low [VOC](0)/[NOx](0). Yield reduction is a result of the formation of a more volatile product distribution as [VOC](0)/[NOx](0) decreases; we propose that the change in the product distribution is driven by changes in the gas-phase chemistry as NOx concentration increases. We also present two-product model parameters to describe aerosol production from the alpha-pinene/O-3/NOx system under both highand low-NOx conditions. C1 Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA. Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
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 title = {Secondary organic aerosol production from terpene ozonolysis. 2. Effect of NOx concentration},
 type = {article},
 year = {2005},
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 pages = {7046-7054},
 volume = {39},
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 abstract = {We report secondary organic aerosol (SOA) yields from the ozonolysis of alpha-pinene in the presence of NO and NO2. Experimental conditions are characterized by the [VOC](0)/ [NOx](0) ratio (ppbC/ppb), which varies from similar to 1 to similar to 300. SOA yield is constant for [VOC](0)/[NOx](0) > similar to 15 and decreases dramatically (by more than a factor of 4) as [VOC](0)/[NOx](0) decreases. Aerosol production is completely suppressed in the presence of NO for [VOC](0)/[NOx](0) <= 4.5. Fourier transform IR analysis of filter samples reveals that nitrate-containing species contribute significantly to the total aerosol mass at low [VOC](0)/[NOx](0). Yield reduction is a result of the formation of a more volatile product distribution as [VOC](0)/[NOx](0) decreases; we propose that the change in the product distribution is driven by changes in the gas-phase chemistry as NOx concentration increases. We also present two-product model parameters to describe aerosol production from the alpha-pinene/O-3/NOx system under both highand low-NOx conditions. C1 Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA. Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.},
 bibtype = {article},
 author = {Presto, A A and Hartz, K E H and Donahue, N M},
 journal = {Environ. Sci. Technol.}
}

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