Particle and Aerosol Research Vol. 2, No. 1, March 2006 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Effect of light intensity on the photooxidation of toluene-NOx-air mixture
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Abstracts
The effect of light intensity on the formation of ozone and secondary organic aerosols during the photooxidation
process of toluene-NOx-air mixtures was investigated in an indoor smog chamber. The smog chamber consists of a
housing, 64 blacklights, and a 5.8-m3 reaction bag made of Teflon film. The initial concentration ratio of
toluene/NOx in ppbC/ppb was fixed at about 11. The toluene and NOx concentrations were in the range of
593~647 ppb and 342~432 ppb, respectively. In this work, the photolysis rate of NO2, k1 was used as an index of
light intensity. Three levels of light intensity were controlled by changing the number of blacklights turned on
among 64 blacklights: 0.19 min-1 (50%), 0.29 min-1 (75%), and 0.39 min-1 (100%). The photooxidation process
was evidently enhanced with increasing light intensity: the NO concentration decayed more quickly and then the
NO2 was formed more quickly. Therefore the ozone concentration increased relatively quickly and reached more
sharply at higher maximum value. The secondary organic aerosols were also formed more quickly and the larger
aerosols followed by the condensational growth as the light intensity increased.
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