TY - JOUR
T1 - Heterogeneous ozonation kinetics of polycyclic aromatic hydrocarbons on organic films
AU - Kahan, T. F.
AU - Kwamena, N. O.A.
AU - Donaldson, D. J.
N1 - Funding Information:
This work was funded by CFCAS and by NSERC. N.-O.A.K. thanks NSERC for the award of a PGS-D scholarship. We are grateful to Ms. S. Handley for experimental assistance.
PY - 2006/6
Y1 - 2006/6
N2 - The room temperature heterogeneous reaction rates of gas-phase ozone with naphthalene, anthracene, fluoranthene, phenanthrene, pyrene, and benzo[a]pyrene were measured over a range of ozone concentrations from 3.5×1014 to 2.3×1016 molec. cm-3. The polycyclic aromatic hydrocarbons (PAHs) were dissolved in organic mixtures composed of octanol or decanol along with proxies for compounds known to be present in "urban grime" films. In all cases, the reaction kinetics were well-described by the Langmuir-Hinshelwood mechanism, which suggests a surface reaction. The adsorption of PAHs to the air-organic interface was confirmed by an adsorption isotherm of anthracene. The presence of the additional organic compounds generally did not affect the reaction rates; however, unsaturated species such as oleic acid and squalene reduced the observed rates significantly.
AB - The room temperature heterogeneous reaction rates of gas-phase ozone with naphthalene, anthracene, fluoranthene, phenanthrene, pyrene, and benzo[a]pyrene were measured over a range of ozone concentrations from 3.5×1014 to 2.3×1016 molec. cm-3. The polycyclic aromatic hydrocarbons (PAHs) were dissolved in organic mixtures composed of octanol or decanol along with proxies for compounds known to be present in "urban grime" films. In all cases, the reaction kinetics were well-described by the Langmuir-Hinshelwood mechanism, which suggests a surface reaction. The adsorption of PAHs to the air-organic interface was confirmed by an adsorption isotherm of anthracene. The presence of the additional organic compounds generally did not affect the reaction rates; however, unsaturated species such as oleic acid and squalene reduced the observed rates significantly.
KW - Air quality
KW - Heterogeneous chemistry
KW - Kinetics
KW - Ozone
KW - Polycyclic aromatic hydrocarbons
KW - Urban films
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U2 - 10.1016/j.atmosenv.2006.02.004
DO - 10.1016/j.atmosenv.2006.02.004
M3 - Article
AN - SCOPUS:33646793322
SN - 1352-2310
VL - 40
SP - 3448
EP - 3459
JO - Atmospheric Environment
JF - Atmospheric Environment
IS - 19
ER -