Characterization of Primary Organic Aerosol Emissions from Meat Cooking, Trash Burning, and Motor Vehicles with High-Resolution Aerosol Mass Spectrometry and Comparison with Ambient and Chamber Observations

2009 ◽  
Vol 43 (7) ◽  
pp. 2443-2449 ◽  
Author(s):  
Claudia Mohr ◽  
J. Alex Huffman ◽  
Michael J. Cubison ◽  
Allison C. Aiken ◽  
Kenneth S. Docherty ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Organic Aerosol ◽  
Motor Vehicles ◽  
Aerosol Mass ◽  
Aerosol Mass Spectrometry ◽  
Meat Cooking ◽  
Aerosol Emissions

Evaluating the Mixing of Organic Aerosol Components Using High-Resolution Aerosol Mass Spectrometry

2011 ◽  
Vol 45 (15) ◽  
pp. 6329-6335 ◽  
Author(s):  
Lea Hildebrandt ◽  
Kaytlin M. Henry ◽  
Jesse H. Kroll ◽  
Douglas R. Worsnop ◽  
Spyros N. Pandis ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Organic Aerosol ◽  
Aerosol Mass ◽  
Aerosol Mass Spectrometry

scholarly journals Evaluating the degree of oxygenation of organic aerosol during foggy and hazy days in Hong Kong using high-resolution time-of-flight aerosol mass spectrometry (HR-ToF-AMS)

2013 ◽  
Vol 13 (2) ◽  
pp. 3533-3573 ◽  
Author(s):  
Y. J. Li ◽  
B. Y. L. Lee ◽  
J. Z. Yu ◽  
N. L. Ng ◽  
C. K. Chan
Keyword(s):  
Mass Spectrometry ◽  
Hong Kong ◽  
High Resolution ◽  
Time Of Flight ◽  
Organic Aerosol ◽  
Present Observation ◽  
Particle Phase ◽  
Resolution Time ◽  
Aerosol Mass ◽  
Aerosol Mass Spectrometry

Abstract. The chemical characteristics of organic aerosol (OA) are still poorly constrained. Here we present observation results of the degree of oxygenation of OA based on high-resolution time-of-flight aerosol mass spectrometry (HR-ToF-AMS) measurements made at a coastal site in Hong Kong from late April to the end of May in 2011. Two foggy periods and one hazy period were chosen for detailed analysis to compare the changes in the degree of oxygenation of OA due to different processes. The Extended Aerosol Inorganic Model (E-AIM) predicted a fine particle liquid water content (LWCfp) up to 85 μg m−3 during the foggy days. Particle concentration as measured by HR-ToF-AMS was up to 60 μg m−3 during the hazy days and up to 30 μg m−3 during the foggy days. The degree of oxygenation of OA, as indicated by several parameters including the fraction of m/z 44 in organic mass spectra (f44), the elemental ratio of oxygen to carbon (O : C), and the carbon oxidation state (OSc), was evaluated against the odd oxygen (Ox) concentration, LWCfp, ionic strength (IS), and in-situ pH (pHis). Results suggest that the high concentration of OA (on average 11 μg m−3) and the high degree of oxygenation (f44 = 0.15, O : C = 0.51, and OSc = −0.31) during the hazy period were mainly due to gas-phase oxidation. During the foggy periods with low photochemical activities, the degree of oxygenation of OA was almost as high as that on the hazy days and significantly higher than that during non-foggy/non-hazy days. However, the OA evolved quite differently in the two foggy periods. The first foggy period in late April saw a larger LWCfp and a lower Ox concentration and the OA was made up of ~ 20% semi-volatile oxygenated organic aerosol (SVOOA) as resolved by positive matrix factorization (PMF). In the second foggy period in mid-May, higher Ox concentration and lower LWCfp were observed, and the OA was found to contain >50% low-volatility oxygenated organic aerosols (LVOOA). An examination of the particle-phase constituents suggests that partitioning may have been the dominating process through which oxygenated species were incorporated into the particle phase during the first foggy period, while oxidation in the aqueous phase may have been the dominating process during the second foggy period. Both physical and chemical processes were found to be important for oxygenated OA formation.

scholarly journals On-line measurement of organic aerosol elemental composition based on high resolution aerosol mass spectrometry

2010 ◽  
Vol 55 (35) ◽  
pp. 3391-3396 ◽  
Author(s):  
YuanHang ZHU Tong ZHANG ◽  
彤 朱 ◽  
Min HU ◽  
Lian XUE ◽  
XiaoFeng HUANG ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Elemental Composition ◽  
Organic Aerosol ◽  
Aerosol Mass ◽  
Aerosol Mass Spectrometry ◽  
Line Measurement ◽  
On Line

scholarly journals Characterization of aerosol chemical composition by aerosol mass spectrometry in Central Europe: an overview

2009 ◽  
Vol 9 (6) ◽  
pp. 24985-25021 ◽  
Author(s):  
V. A. Lanz ◽  
A. S. H. Prévôt ◽  
M. R. Alfarra ◽  
C. Mohr ◽  
P. F. DeCarlo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Aerosol ◽  
Volatile Fraction ◽  
Wood Combustion ◽  
Average Mass ◽  
Aerosol Mass ◽  
Aerosol Mass Spectrometry ◽  
Field Campaigns ◽  
Mobile Measurements

Abstract. Real-time measurements of non-refractory submicron aerosols (NR-PM1) were conducted within the greater Alpine region (Switzerland, Germany, Austria, France and Liechtenstein) during several week-long field campaigns in 2002–2009. A large variety of sites was covered including urban backgrounds, motorways, rural, remote, and high-Alpine stations, and also mobile on-road measurements were performed. Inorganic and organic aerosol (OA) fractions were determined by means of aerosol mass spectrometry (AMS). The average mass concentration of NR-PM1 for the different campaigns typically ranged between 10 and 30 μg m−3. Overall, the organic portion was most abundant, ranging from 36% to 81% of NR-PM1. Other main constituents comprised ammonium (5–15%), nitrate (8–36%), sulfate (3–26%), and chloride (0–5%). These latter anions were, on average, fully neutralized by ammonium. The OA was further divided (based on factor analysis, FA) into its underlying components, such as oxygenated (mostly secondary) organic aerosol (OOA), hydrocarbon-like and freshly emitted organic aerosol (HOA), as well as primary OA from biomass burning (P-BBOA). OOA was ubiquitous, ranged between 36% and 94% of OA, and could be separated into a low-volatility and a semi-volatile fraction (LV-OOA and SV-OOA) for all summer campaigns at low sites. Primary wood combustion (P-BBOA) accounted for a considerable fraction during wintertime (17–49% OA). HOA/OA ratios were comparatively low for all campaigns (6–16%) with the exception of on-road, mobile measurements (23%).

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