Vapor- and aerosol-phase atmospheric organic matter in urban air of the Midwest USA

2021 ◽  
Vol 264 ◽  
pp. 118705
Author(s):  
Rosa M. Flores ◽  
Paul V. Doskey
Keyword(s):  
Organic Matter ◽  
Urban Air ◽  
Atmospheric Organic Matter

scholarly journals Structural Features and Pro-Inflammatory Effects of Water-Soluble Organic Matter in Inhalable Fine Urban Air Particles

2019 ◽  
Vol 54 (2) ◽  
pp. 1082-1091 ◽  
Author(s):  
Antoine S. Almeida ◽  
Rita M. P. Ferreira ◽  
Artur M. S. Silva ◽  
Armando C. Duarte ◽  
Bruno M. Neves ◽  
...  
Keyword(s):  
Organic Matter ◽  
Structural Features ◽  
Water Soluble ◽  
Urban Air ◽  
Soluble Organic Matter

scholarly journals Oligomers, organosulfates, and nitrooxy organosulfates in rainwater identified by ultra-high resolution electrospray ionization FT-ICR mass spectrometry

2009 ◽  
Vol 9 (7) ◽  
pp. 2533-2542 ◽  
Author(s):  
K. E. Altieri ◽  
B. J. Turpin ◽  
S. P. Seitzinger
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
High Resolution ◽  
Electrospray Ionization ◽  
Mass Range ◽  
Negative Ion ◽  
Ion Cyclotron Resonance ◽  
Important Input ◽  
Atmospheric Organic Matter ◽  
Ft Icr

Abstract. Wet deposition is an important removal mechanism for atmospheric organic matter, and a potentially important input for receiving ecosystems, yet less than 50% of rainwater organic matter is considered chemically characterized. Precipitation samples collected in New Jersey, USA, were analyzed by negative ion ultra-high resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Elemental compositions of 552 unique molecular species were determined in the mass range 50–500 Da in the rainwater. Four main groups of organic compounds were identified: compounds containing carbon, hydrogen, and oxygen (CHO) only, sulfur (S) containing CHOS compounds, nitrogen (N) containing CHON compounds, and S- and N- containing CHONS compounds. Organic acids commonly identified in precipitation were detected in the rainwater. Within the four main groups of compounds detected in the rainwater, oligomers, organosulfates, and nitrooxy-organosulfates were assigned based on elemental formula comparisons. The majority of the compounds identified are products of atmospheric reactions and are known contributors to secondary organic aerosol (SOA) formed from gas phase, aerosol phase, and in-cloud reactions in the atmosphere. It is suggested that the large uncharacterized component of SOA is the main contributor to the large uncharacterized component of rainwater organic matter.

Processing of atmospheric organic matter by California radiation fogs

2008 ◽  
Vol 87 (3-4) ◽  
pp. 232-241 ◽  
Author(s):  
Jeffrey L. Collett ◽  
Pierre Herckes ◽  
Sarah Youngster ◽  
Taehyoung Lee
Keyword(s):  
Organic Matter ◽  
Radiation Fogs ◽  
Atmospheric Organic Matter

Mutagenic activity of non-volatile organic matter associated with suspended matter in urban air

1982 ◽  
Vol 104 (4-5) ◽  
pp. 201-207 ◽  
Author(s):  
F. de Wiest ◽  
D. Rondia ◽  
R. Gol-Winkler ◽  
J. Gielen
Keyword(s):  
Organic Matter ◽  
Suspended Matter ◽  
Mutagenic Activity ◽  
Urban Air ◽  
Volatile Organic

scholarly journals Molecular insights on aging and aqueous phase processing from ambient biomass burning emissions-influenced Po Valley fog and aerosol

2018 ◽  
Author(s):  
Matthew Brege ◽  
Marco Paglione ◽  
Stefania Gilardoni ◽  
Stefano Decesari ◽  
Maria Cristina Facchini ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Biomass Burning ◽  
Nmr Analysis ◽  
Fog Water ◽  
Po Valley ◽  
Two Samples ◽  
Atmospheric Organic Matter ◽  
Ft Icr Ms ◽  
Ft Icr

Abstract. Atmospheric organic matter is a complex mixture of thousands of individual organic compounds originating from a combination of primary emissions and secondary processes. To study the influence of regional biomass burning emissions and secondary processes, ambient samples of fog and aerosol were collected in the Po Valley (Italy) during the 2013 Supersito field campaign. After the extent of fresh vs. aged biomass burning influence was estimated from proton nuclear magnetic resonance (1H-NMR) and high resolution time of flight aerosol mass spectrometry (HR-TOF-AMS) observations, two samples of fog water and two samples of PM1 aerosol were selected for ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis. Over 4300 distinct molecular formulas were assigned to electrospray ionization FT-ICR MS anions and were sorted into four elemental groups (CHO, CHNO, CHOS and CHNOS) and 64 subclasses. Molecular weight distributions indicated that the water-soluble organic matter was largely non-polymeric without clearly repeating units, although some evidence of dimerization was observed for C10 compounds and especially for C8–9 CHNO species in the aged aerosol. The selected samples had an atypically large frequency of molecular formulas containing nitrogen and sulfur (not evident in the NMR composition) attributed to multifunctional organonitrates and organosulfates. While higher numbers of organonitrates were observed in aerosol (dry or deliquesced particles), higher numbers of organosulfates were mostly found in fog water and so chemical reactions promoted by liquid water must be postulated for their formation. Consistent with the observation of an enhanced aromatic proton signature in the 1H-NMR analysis, the average molecular formula double bond equivalents and carbon numbers were higher in the fresh biomass burning influenced samples, whereas the average O : C and H : C values from FT-ICR MS were higher in the samples with an aged influence (O : C > 0.6 and H : C > 1.2). The aged fog had a large set of unique highly oxygenated CHO fragments in HR-TOF-AMS mass spectra, which reflects an enrichment of carboxylic acids and other compounds carrying acyl groups as highlighted by the NMR analysis. Fog compositions were more SOA-like than aerosols as indicated by the observed similarity between the aged aerosol and fresh fog, implying that fog nuclei must be somewhat aged. Overall, functionalization with nitrate and sulfate moieties in addition to aqueous oxidation trigger an increase in the molecular complexity in this environment, which is apparent in the FT-ICR MS results. This study demonstrates the significance of the aqueous phase to transform the molecular chemistry of atmospheric organic matter and contribute to secondary organic aerosol.

scholarly journals Atmospheric organic matter in clouds: exact masses and molecular formula identification using ultrahigh-resolution FT-ICR mass spectrometry

2013 ◽  
Vol 13 (24) ◽  
pp. 12343-12362 ◽  
Author(s):  
Y. Zhao ◽  
A. G. Hallar ◽  
L. R. Mazzoleni
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Cloud Water ◽  
Wood Combustion ◽  
Ultrahigh Resolution ◽  
Reduced Sulfur ◽  
Atmospheric Organic Matter ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds ◽  
Ft Icr

Abstract. Clouds alter the composition of atmospheric aerosol by acting as a medium for interactions between gas- and particulate-phase substances. To determine the cloud water atmospheric organic matter (AOM) composition and study the cloud processing of aerosols, two samples of supercooled clouds were collected at the Storm Peak Laboratory near Steamboat Springs, Colorado (3220 m a.s.l.). Approximately 3000 molecular formulas were assigned to ultrahigh-resolution mass spectra of the samples after using a reversed-phase extraction procedure to isolate the AOM components from the cloud water. Nitrogen-containing compounds (CHNO compounds), sulfur-containing compounds (CHOS and CHNOS compounds) and other oxygen-containing compounds (CHO compounds) with molecular weights up to 700 Da were observed. Average oxygen-to-carbon ratios of ∼0.6 indicate a slightly more oxidized composition than most water-soluble organic carbon identified in aerosol studies, which may result from aqueous oxidation in the clouds. The AOM composition indicates significant influences from biogenic secondary organic aerosol (SOA) and residential wood combustion. We observed 60% of the cloud water CHO molecular formulas to be identical to SOA samples of α-pinene, β-pinene, d-limonene, and β-caryophyllene ozonolysis. CHNO compounds had the highest number frequency and relative abundances and are associated with residential wood combustion and NOx oxidation. Multiple nitrogen atoms in the assigned molecular formulas for the nighttime cloud sample composite were observed, indicating the significance of nitrate radical reactions on the AOM composition. Several CHOS and CHNOS compounds with reduced sulfur (in addition to the commonly observed oxidized sulfur-containing compounds) were also observed; however further investigation is needed to determine the origin of the reduced sulfur-containing compounds. Overall, the molecular composition determined using ultrahigh-resolution Fourier-transform ion cyclotron resonance (FT-ICR) mass spectrometry provides an unambiguous identification of the cloud water organic anion composition in the Rocky Mountain area that could help to improve the understanding of aqueous-phase processes.

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