Source identification and characterization of organic nitrogen in atmospheric aerosols at a suburban site in China

https://doi.org/10.1016/j.scitotenv.2021.151800Get rights and content
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Highlights

  • Characterization of organic nitrogen (ON) ions

  • Quantify the sources of ON in submicron aerosols

  • Comparison between regular organic aerosol PMF analysis and PMF_ON analysis.

Abstract

Despite the fact that atmospheric particulate organic nitrogen (ON) can significantly affect human health, ecosystems and the earth's climate system, qualitative and quantitative chemical characterization of ON remains limited due to its chemical complexity. In this study, the Aerodyne soot particle - high-resolution time-of-flight aerosol mass spectrometer (SP-AMS) was deployed for ambient measurements in Nanjing, China. Positive matrix factorization (PMF) was applied to the ON data to quantify the sources of ON in submicron aerosols. The averaged ON concentration was 1.24 μg m−3, while the averaged total nitrogen (TN) in the aerosol was 20.26 μg m−3. From the PMF ON analysis, a 5-factor solution was selected as the most representative and interpretable solution for the investigated dataset, including oxygenated OA (OOAON), amine-related OAON (AMOAON), hydrocarbon-like OA (HOAON), industry OA (IOAON), and local primary OA (POAON) factors. The quantified ON ions were separated into families, including CxHN, CxHyNO, C3H<6N, CxH2x+2N, CxH2xN and Others, consistent with their contribution to each factor. The CxHyNO family mainly contributed to the OOAON factor and suggested the presence of amides or amino acids. The CxH2x+2N family likely mostly originated from amines only contributing to the AMOAON and HOAON factors. The IOAON and POAON factors were resolved due to significant tracers in the mass spectra. Further, compared with regular organic PMF analysis, PMF ON analysis gave more insights due to improved source separation and interpretability of the OA components, which could be a role model for further atmospheric ON research.

Graphical abstract

The retrieved PMF ON factors were defined as: Oxygenated secondary OA (OOAON), amine-related OA (AMOAON), hydrocarbon-like OA (HOAON), industry OA (IOAON), and local primary OA (POAON).

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Keywords

Organic nitrogen
Source apportionment
PMF_ON

Cited by (0)

1

Datalystica Ltd., Park innovAARE, 5234 Villigen, Switzerland.

2

Metrology Research Centre, 1200 Montreal Road, Ottawa K1A 0R6, Ontario, Canada.