Characterising Particulate Organic Nitrogen at A Savannah-Grassland Region in South Africa

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http://hdl.handle.net/10138/306484

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Booyens , W , Van Zyl , P G , Beukes , J P , Ruiz-Jimenez , J , Kopperi , M , Riekkola , M-L , Vakkari , V , Josipovic , M , Kulmala , M & Laakso , L 2019 , ' Characterising Particulate Organic Nitrogen at A Savannah-Grassland Region in South Africa ' , Atmosphere - Ocean , vol. 10 , no. 9 , 492 . https://doi.org/10.3390/atmos10090492

Title: Characterising Particulate Organic Nitrogen at A Savannah-Grassland Region in South Africa
Author: Booyens, Wanda; Van Zyl, Pieter G.; Beukes, Johan P.; Ruiz-Jimenez, Jose; Kopperi, Matias; Riekkola, Marja-Liisa; Vakkari, Ville; Josipovic, Miroslav; Kulmala, Markku; Laakso, Lauri
Contributor: University of Helsinki, Department
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2019-09
Language: eng
Number of pages: 17
Belongs to series: Atmosphere - Ocean
ISSN: 0705-5900
URI: http://hdl.handle.net/10138/306484
Abstract: Although atmospheric organic N compounds are considered to be important, especially in new particle formation and their contribution to brown carbon, these species are not that well understood. This can be partially attributed to their chemical complexity. Therefore, the aim of this study was to assess the characteristics of organic N compounds utilising comprehensive two-dimensional gas chromatography coupled with a time-of-flight mass spectrometer (GCxGC-TOFMS) in aerosol samples that were collected at a savanna-grassland background region and to determine the possible sources. 135 atmospheric organic N compounds were tentatively characterised and semi-quantified, which included amines, nitriles, amides, urea, pyridine derivatives, amino acids, nitro-and nitroso compounds, imines, cyanates and isocyanates, and azo compounds. Amines contributed to 51% of the semi-quantified concentrations, while nitriles, pyridine derivatives, and amides comprised 20%, 11%, and 8%, respectively, of the semi-quantified concentrations. Amines, nitriles, amides, and pyridine derivatives concentrations were higher during the dry season, which were attributed to meteorology and open biomass burning. Anthropogenic sources impacting air masses measured at Welgegund, as well as regional agricultural activities, were considered as the major sources of amines, while the regional influence of household combustion was most likely the main source of nitriles, amides, and pyridine derivatives. The other organic N species were most likely related to the influence of local and regional agricultural activities.
Subject: atmospheric aerosols
organic aerosols
amines
agricultural
GCxGC-TOFMS
Welgegund
2-DIMENSIONAL GAS-CHROMATOGRAPHY
FLIGHT MASS-SPECTROMETRY
ULTRAFINE 30 NM
AEROSOL
CARBON
DEPOSITION
RAIN
ATMOSPHERE
CALIFORNIA
CHEMISTRY
116 Chemical sciences
114 Physical sciences
1172 Environmental sciences
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