都會區大氣中超細粒徑微粒之特性探討(III)
Other Title
Characterization of Ultrafine Particles in Urban Atmosphere (III)
Date Issued
2002-07-31
Date
2002-07-31
Author(s)
王秋森
DOI
902320B002174
Abstract
Oxidation of volatile organic gases in
ambient air produces low-volatility
compounds that condense to form secondary
aerosol particles. In urban areas, the major
sources of precursors for secondary organic
aerosols (SOA) are the reactive organic gases
(ROG) emitted from motor vehicles. This
study aims at investigating the SOA and
reactive oxygen species (ROS) formation
potential of diluted motorcycle exhaust.
Irradiation of diluted motorcycle exhaust
led to rapid formation of SOA. The particle
number concentration in the bag peaked at
2-3 hours after UV irradiation. On the other
hand, the gaseous ROS concentration
increased with time to a peak at 5~7 hours.
The peak concentration of gaseous ROS was
about one-order of magnitude higher than the
initial concentration in diluted motorcycle
exhaust. The results suggest that the
motorcycle exhaust with particles removed
has a high potential to form ROS and SOA
under UV irradiation.
Subjects
secondary organic aerosols
(SOA)
(SOA)
motorcycle exhaust
reactive oxygen
species (ROS)
species (ROS)
photochemical reactions
Publisher
臺北市：國立臺灣大學公共衛生學院公共衛生學系
Type
report
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