자동차 배기가스 중 입자상 탄소성분 내 PAHs의 정성적 비율 추정

Abstract

Since the emergence of domestically produced automobiles in 1964, the number of automobiles in circulation inSouth Korea has increased constantly. With this rapidly increasing number of automobiles, automobile-inducedenvironmental pollution has become an issue of great concern, especially with regard to air pollution. Of the carboncomposites contained in automobile exhaust gas, PAHs are known to be carcinogenic and highly deleterious tohumans and thus need to be urgently mitigated. To address this issue of PAHs, this study was conducted to estimatequalitative of particulate PAHs contained in carbon composites in automobile exhaust gas, by capturing all particulatematter discharged from the latter. To allow for differentiated analyses, the automobiles investigated were dividedinto 4 groups: gasoline vehicle, motocycle, diesel vehicle, and LPG vehicle. Samples were analyzed using twomethods. First, in-depth analysis was performed on organic carbon (OC) and elemental carbon (EC) composites withanalysis parameters, using the Thermal Optical Transmittance Method (NIOSH 5040). Second, for the examinationof particulate PAHs, GC/MSD was used to analyze the 16 PAH species specified by the Environmental ProtectionAgency (EPA). The analyses yielded the findings that diesel vehicles had the highest mass concentration (2,007 μg/m3), followed by motocycle (1,066 μg/m3), LPG vehicle (392 μg/m3), and gasoline vehicles (270 μg/m3). The highestcarbon concentrations in total particulate matter by vehicle weight were produced from LPG vehicle (79.8%), followedby gasoline vehicle (77.4%), motocycle (69.8%), and diesel vehicle (59.1%).