TY - JOUR
T1 - Diurnal characteristics of volatile organic compounds in the Seoul atmosphere
AU - Na, Kwangsam
AU - Kim, Yong Pyo
AU - Moon, Kil Choo
N1 - Funding Information:
This work was supported in part by the National Research Laboratory Program of Korean Ministry of Science and Technology (2000-N-NL-01-C-184).
PY - 2003/2
Y1 - 2003/2
N2 - Concentrations of volatile organic compounds (VOCs) were measured at a site in central Seoul from 8 to 13 September 1998. On each sampling day, three 2-h-integrated canister samples were collected in the morning, afternoon and evening, respectively, to observe diural variations of VOCs. Most of the VOCs species showed diurnal variations with higher concentrations during the morning and evening, and lower concentrations during the afternoon. However, in the afternoon, the concentrations of aromatic compounds, closely correlated with solvent usage such as toluene, ethylbenzene, m-/p-xylene, and o-xylene, were slightly higher than or comparable to those in the morning. This may be due to the increase of evaporative emissions derived from the rise in ambient temperature and additional sources such as the use of solvents in painting, printing and dry cleaning. To estimate the participation of individual VOCs in ozone formation, propylene equivalent concentrations were calculated. The results showed that toluene was the most dominant contributor to ozone formation as well as ambient VOC concentrations. Toluene/benzene and m-/p-xylene/benzene ratios showed a high observed in the afternoon and a low observed in the morning and evening. This may be because the contribution of evaporative emissions by solvent usage on the ambient VOC concentrations is more dominant than those of vehicle-related emissions and photochemical loss.
AB - Concentrations of volatile organic compounds (VOCs) were measured at a site in central Seoul from 8 to 13 September 1998. On each sampling day, three 2-h-integrated canister samples were collected in the morning, afternoon and evening, respectively, to observe diural variations of VOCs. Most of the VOCs species showed diurnal variations with higher concentrations during the morning and evening, and lower concentrations during the afternoon. However, in the afternoon, the concentrations of aromatic compounds, closely correlated with solvent usage such as toluene, ethylbenzene, m-/p-xylene, and o-xylene, were slightly higher than or comparable to those in the morning. This may be due to the increase of evaporative emissions derived from the rise in ambient temperature and additional sources such as the use of solvents in painting, printing and dry cleaning. To estimate the participation of individual VOCs in ozone formation, propylene equivalent concentrations were calculated. The results showed that toluene was the most dominant contributor to ozone formation as well as ambient VOC concentrations. Toluene/benzene and m-/p-xylene/benzene ratios showed a high observed in the afternoon and a low observed in the morning and evening. This may be because the contribution of evaporative emissions by solvent usage on the ambient VOC concentrations is more dominant than those of vehicle-related emissions and photochemical loss.
KW - Diurnal variations
KW - Evaporative emission
KW - Propylene equivalent concentration
KW - Solvent usage
KW - VOCs
UR - http://www.scopus.com/inward/record.url?scp=0037289715&partnerID=8YFLogxK
U2 - 10.1016/S1352-2310(02)00956-1
DO - 10.1016/S1352-2310(02)00956-1
M3 - Article
AN - SCOPUS:0037289715
SN - 1352-2310
VL - 37
SP - 733
EP - 742
JO - Atmospheric Environment
JF - Atmospheric Environment
IS - 6
ER -