Abstract/Details

Characterization of chemical composition and sources of PM2.5 aerosols


2005 2005

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Abstract (summary)

Fine particles (PM2.5), ≤2.5 μm, reduce visibility, affect global climate, and human health. Therefore we investigated the chemical composition and sources of PM2.5 aerosols in metropolitan New York (Queens) and two rural locations, Pinnacle State Park (∼350 km to the northwest) and Whiteface Mt (∼390 km north, ∼1.5 km amsl). Daily PM2.5 aerosols were collected on Zeflour filters, July 1, 2001 to June 30, 2002. Filters were analyzed for SO42− by ion-chromatography and by inductively coupled plasma mass spectrometry for Mg, Al, Ca, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Cd, Sb and Pb in water-leached and acid digested aliquots of the aerosols. The highest annual mean concentrations were observed at Queens followed by Pinnacle State Park and Whiteface Mountain. Since the bioavailibility is an important factor in determining the health impact of various species the concentrations of the soluble fraction as well as the total were determined. The soluble fractions at the three sites were essentially the same. The mean solubilities were (%): Mg, 94 ± 21; V, 91 ± 13; Zn, 88 ± 22; As, 87 ± 20; Mn, 83 ± 20; Pb, 83 ± 21; Se, 77 ± 21; Sb, 75 ± 17; Co, 65 ± 16; Fe, 58 ± 21; and Ni, 55 ± 20. The oxides of V, Mn, As, Se and Sb are highly soluble. It appears that these elements were produced during high temperature combustion. The contributions from nearby and distant regional sources were evaluated by correlating the daily-observed concentrations with 3-day backward HYSPLIT 4 air trajectories. At Queens, 44–55% of SO4 2− was transported from the Midwest, whereas ∼60% was transported to Pinnacle State Park and Whiteface Mt. The transported component of trace metals at Queens were (%): Se, ∼50; Ni, Sb and Pb, ∼30–40; Mg, Mn, As, Co and Fe, ∼20–27; and V and Zn, <20 are transported. Based on Positive Matrix Factorization analysis, the emissions from coal and oil-fired power plants motor vehicles, sea salt and soil were the major contributors. The SO42− aerosols contributed up to ∼50% of the PM2.5 mass. Hence, any strategy to minimize the atmospheric PM2.5 mass must curtail emissions from fossil fuel burning.

Indexing (details)


Subject
Environmental science;
Atmosphere
Classification
0768: Environmental science
0608: Atmosphere
Identifier / keyword
Health and environmental sciences; Pure sciences; Aerosols; Atmospheric aerosols; Particulate matter; Sulfates
Title
Characterization of chemical composition and sources of PM2.5 aerosols
Author
Qureshi, Sumizah
Number of pages
309
Publication year
2005
Degree date
2005
School code
0668
Source
DAI-B 66/07, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0542221500, 9780542221507
Advisor
Husain, Liaquat
University/institution
State University of New York at Albany
University location
United States -- New York
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3181798
ProQuest document ID
305369189
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305369189
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