DOI: 10.1029/2012JD017868
论文题名: Speciation and trends of organic nitrogen in southeastern U.S. fine particulate matter (PM<inf>2.5</inf>)
作者: Samy S. ; Robinson J. ; Rumsey I.C. ; Walker J.T. ; Hays M.D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 4 起始页码: 1996
结束页码: 2006
语种: 英语
英文关键词: amino acids
; atmospheric proteinaceous material
; heterocyclic amines
; MARGA
; organic nitrogen
; water-soluble organic compounds
; β-carboline photosensitizers
Scopus关键词: Aerosols
; Air quality
; Meteorology
; Nitrogen
; Organic compounds
; Ozone
; Particles (particulate matter)
; Photosensitizers
; Heterocyclic amines
; MARGA
; Organic nitrogen
; Proteinaceous materials
; Water soluble organic compounds
; Amino acids
; air quality
; amino acid
; atmospheric chemistry
; biomass burning
; concentration (composition)
; meteorology
; organic nitrogen
; oxidation
; particulate matter
; speciation (chemistry)
; United States
英文摘要: The impacts of meteorology and air quality on the concentrations and relative distributions of free and combined amino acids (FAA; CAA) are evaluated during a month-long sampling campaign at a semiurban site in the southeastern U.S. The average FAA concentration in fine aerosols (PM2.5 ) was 11 ± 6 ng m-3, while CAA was found to be several times higher at 46 ± 21 ng m-3. Glycine and alanine were the most abundant amino acids, accounting for 48% of FAA and 58% of the CAA, while distinct differences were observed in compound distributions; glutamic acid, aspartic acid, serine, and threonine accounted for a further 29% of FAA and 30% of the total CAA. An intense rainfall event during the campaign demonstrated the significant impact of meteorological and air quality conditions on FAA-CAA concentrations and distributions. Correlative trends with atmospheric oxidant (ozone) and inorganic nitrogen levels suggest an important role for atmospheric processing. The liquid chromatography-mass spectrometry (quadrupole time-of-flight) technique used in this study allowed for detection of coextracted water-soluble organic compounds and characterization of a larger fraction of the organic nitrogen mass. N-heterocyclic compounds were detected in samples from this campaign, indicating a likely biomass burning source contribution for organic nitrogen. Key PointsFree and combined amino acids (FAA; CAA) in aerosols (PM2.5) are investigatedResults are linked with meteorology, ozone levels, and inorganic N trendsAtmospheric processing plays an important role in understanding speciated ON © 2012. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63924
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: National Risk Management Research Laboratory (NRMRL), U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States
Recommended Citation:
Samy S.,Robinson J.,Rumsey I.C.,et al. Speciation and trends of organic nitrogen in southeastern U.S. fine particulate matter (PM<inf>2.5</inf>)[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(4)