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Kinetic Studies of Heterogeneous Reaction of HO 2 Radical by Dicarboxylic Acid Particles
Author(s) -
Taketani Fumiakzu,
Kanaya Yugo,
Akimoto Hajime
Publication year - 2013
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20783
Subject(s) - adipic acid , chemistry , dicarboxylic acid , succinic acid , glutaric acid , aerosol , aqueous solution , particle (ecology) , relative humidity , analytical chemistry (journal) , inorganic chemistry , nuclear chemistry , organic chemistry , meteorology , oceanography , physics , geology
The HO 2 uptake coefficients (γ) for organic submicron aerosol particles were measured using an aerosol flow tube coupled with a chemical conversion/laser‐induced fluorescence technique under ambient conditions (760 Torr and 296 ± 2 K) and different values of relative humidity (RH) (28% and 68%). Determined uptake coefficients for succinic, glutaric, adipic, and pimelic acid aerosol particles at 28% RH were 0.07 ± 0.02, 0.07 ± 0.03, 0.02 ± 0.01, and 0.06 ± 0.03, respectively, whereas the γ values for those particles at 68% RH were 0.18 ± 0.07, 0.15 ± 0.04, 0.06 ± 0.01, and 0.13 ± 0.04, respectively. An increase in γ with increasing RH was observed for all the dicarboxylic acids, suggesting a contribution by water amount in the particle, aqueous phase chemistry, and uptake of HO 2 –H 2 O. The anomalously low γ values for adipic acid are likely related to its high crystallization RH and thus provide a new clue that the water amount and/or RH have a significant influence on HO 2 uptake.