Light degrading properties of size-fractionated PM10 aerosol samples collected from an industrial area in Brisbane, Australia.

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Title Light degrading properties of size-fractionated PM10 aerosol samples collected from an industrial area in Brisbane, Australia.
Author Chan, Andrew Yiu Chung; McTainsh, Grant Harvey; Simpson, R. W.; Vowles, Peter David; Cohen, D. D.; Bailey, G. M.
Journal Name Aerosol Science and Technology
Year Published 2002
Place of publication USA
Publisher Taylor and Francis
Abstract Thirty-seven days of PM 10 aerosol samples (particles with aerodynamic diameter <10 μm) were collected in an industrial area in Brisbane during April to June 1999 to study the light extinction efficiencies of urban aerosols in different size ranges. The light scattering coefficient of the air was measured by nephelometry. The light absorption coefficient of the aerosol samples was measured by the integrating plate laser absorption method. Multiple linear regression techniques were used to investigate the relationships between the visibility degrading properties and the chemical composition of the aerosol samples. The results are comparable with those from other visual air quality studies. The absorption of light by fine (PM 2.5 ) aerosols is mainly due to elemental carbon (EC) particles smaller than 0.5 μm. The b 0 ap values of EC particles in different size ranges are 9.08 (< 2.7 μm) and 0.32 (2.7-10 μm)m 2 g -1 , respectively. The absorption of light by coarse (PM 2.5-10 ) aerosols is mainly due to soil ( b 0 ap = 0.17) and organic ( b 0 ap = 1.11) particles. The scattering of light is highly related to the concentration of fine particles in the air (mass scattering efficiency b 0 sp = 1.65) and is mainly due to the fine sulphate ( b 0 sp = 10.9), soil ( b 0 sp = 2.73), and EC ( b 0 sp = 3.89) particles. On average, fine EC (44%), sulphate (20%) and soil (7%) particles, NO 2 (9%), and Rayleigh scattering (19%) were the largest contributors of visibility degradation for the sampling days in this study.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.informaworld.com/smpp/title~db=all~content=t713656376
Alternative URI http://dx.doi.org/10.1080/02786820290038537
Volume 36
Page from 890
Page to 898
ISSN 0278-6826
Date Accessioned 2003-03-03
Date Available 2009-10-01T05:57:25Z
Language en_AU
Research Centre Atmospheric Environment Research Centre
Faculty Faculty of Environmental Sciences
Subject PRE2009-Environmental Chemistry (incl. Atmospheric Chemistry)
URI http://hdl.handle.net/10072/6764
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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