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- Title
Measurement of overall uptake coefficients for HO<sub>2</sub> radicals by aerosol particles sampled from ambient air at Mts. Tai and Mang (China).
- Authors
Taketani, F.; Kanaya, Y.; Pochanart, P.; Liu, Y.; Li, J.; Okuzawa, K.; Kawamura, K.; Wang, Z.; Akimoto, H.
- Abstract
HO2 uptake coefficients for ambient aerosol particles, collected on quartz fiber filter using a high-volume air sampler in China, were measured using an aerosol flow tube coupled with a chemical conversion/laser-induced fluorescence technique at 760 Torr and 298K, with a relative humidity of 75%. Aerosol particles were regenerated with an atomizer using the water extracts from the aerosol particles. Over 10 samples, the measured HO2 uptake coefficients for the aerosol particles at the Mt. Tai site were ranged from 0.13 to 0.34, while those at the Mt. Mang site were in the range of 0.09-0.40. These values are generally larger than those previously reported for single-component particles, suggesting that reactions with the minor components such as metal ions and organics in the particle could contribute to the HO2 uptake. A box model calculation suggested that the heterogeneous loss of HO2 by ambient particles could significantly affect atmospheric HOx concentrations and chemistry.
- Subjects
CHINA; ATMOSPHERIC aerosols; AIR pollution; RADICALS (Chemistry); ATMOSPHERIC chemistry; QUARTZ fibers; HYDROGEN; CHEMICAL reactions; ATOMIZERS
- Publication
Atmospheric Chemistry & Physics, 2012, Vol 12, Issue 24, p11907
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-12-11907-2012