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There is growing evidence that organo-nitrogen compounds may constitute asignificant fraction of the aerosol nitrogen (N) budget. However, very littleis known about the abundance and origin of this aerosol fraction. In thisstudy, the concentration of organic nitrogen (ON) and major inorganic ions inPM2.5 aerosol were measured at the Duke Forest Research Facilitynear Chapel Hill, NC, during January and June of 2007. A novel on-lineinstrument was used, which is based on the Steam Jet Aerosol Collector (SJAC)coupled to an on-line total carbon/total nitrogen analyzer and two on-lineion chromatographs. The concentration of ON was determined by tracking thedifference in concentrations of total nitrogen and of inorganic nitrogen(determined as the sum of N-ammonium and N-nitrate). The time resolution ofthe instrument was 30 min with a detection limit for major aerosolcomponents of ~0.1 μg m−3. Nitrogen in organic compounds contributed ~33% on average to the totalnitrogen concentration in PM2.5, illustrating the importance ofthis aerosol component. Absolute concentrations of ON, however, wererelatively low (<1.0 μg m−3) with an average of0.16 μg m−3. The absolute and relative contribution of ON tothe total aerosol nitrogen budget was practically the same in January andJune. In January, the concentration of ON tended to be higher during thenight and early morning, while in June it tended to be higher during the lateafternoon and evening. Back-trajectories and correlation with wind directionindicate that higher concentrations of ON occur in air masses originatingover the continental US, while marine air masses are characterized by lowerON concentrations. The data presented in this study suggests that ON has avariety of sources, which are very difficult to quantify without informationon chemical composition of this important aerosol fraction

Organic nitrogen in PM&lt;sub&gt;2.5&lt;/sub&gt; aerosol at a forest site in the Southeast US

Organic nitrogen in PM<sub>2.5</sub> aerosol at a forest site in the Southeast US