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Environ Sci Technol. 2010 Jul 15;44(14):5540-5. doi: 10.1021/es100926x.

Real time in situ detection of organic nitrates in atmospheric aerosols.

Author information

1
Department of Chemistry, University of California, Berkeley, California, USA.

Abstract

A novel instrument is described that quantifies total particle-phase organic nitrates in real time with a detection limit of 0.11 microg m(-3) min(-1), 45 ppt min(-1) (-ONO(2)). Aerosol nitrates are separated from gas-phase nitrates with a short residence time activated carbon denuder. Detection of organic molecules containing -ONO(2) subunits is accomplished using thermal dissociation coupled to laser induced fluorescence detection of NO(2). This instrument is capable of high time resolution (seconds) measurements of particle-phase organic nitrates, without interference from inorganic nitrate. Here we use it to quantify organic nitrates in secondary organic aerosol generated from high-NO(x) photooxidation of limonene, alpha-pinene, Delta-3-carene, and tridecane. In these experiments the organic nitrate moiety is observed to be 6-15% of the total SOA mass.

PMID:
20575535
DOI:
10.1021/es100926x
[Indexed for MEDLINE]

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