Air Particulate-bound Polycyclic Aromatic Hydrocarbons in Relation to Traffic Emission in Taipei

• Main Authors: Chin-Hung Cho, 卓金鴻
• Other Authors: 林嘉明
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/73583341384501705160

碩士 === 國立臺灣大學 === 環境衛生研究所 === 95 === This study was aimed to determine ten ambient particulate-bound polycyclic aromatic hydrocarbons（PAHs） with four or more aromatic rings to estimate the contribution from traffic emission in Taipei City. Samples were taken in winter for 6∼7 weeks at two sites, downtown with heavy traffic and campus with relatively light traffic. The total suspended particulates was collected for 24h by using a three pieces cassette holder with 37mm TEF filter incorporated with a medium-volume air sampler at flow rate of 10 L/min. The particulate-bound polycyclic aromatic hydrocarbons（PAHs）were quantified by GC-MS after the mass concentration of particulate was determined. The results show that average mass concentration of the air suspended particulates ranged from 84.86±9.96μg/m3 in downtown and 50.60±8.99μg/m3 in campus, and the corresponding concentration of PAHs were 95.33±5.64ng/m3 and 55.03±4.76ng/m3, respectively. Correlation of particulate mass concentration or PAHs concentration to CO, NMHC, NO2, NOX, O3, PM10, SO2 and THC from the neighbor air quality monitoring stations, indicate that vehicle exhaust is a major pollutant source. Upon the four methods with basis of City Traffic PAH Emission Profile, the estimated contribution of vehicle emission to PAHs in downtown and in campus by methods, were 82.62％, 80.79％, 87.53％, 84.52％ and at campus were 74.24％, 70.95％, 78.62％, 73.48％, respectively. However, Principal Component Analysis（PCA）demonstrated that the result in downtown and in campus were 80.23％ and 73.22％, respectively. When the PAHs emission diagnostic ratios were applied to evaluate the catalyst-equipped vehicles and the non-catalyst vehicles contribution to PAHs, the catalyst-equipped and non-catalyst vehicles accounted for 38.68％ and 61.83％, respectively in downtown；40.24％ and 57.66％, respectively in campus. Overall, the traffic contribution to air particulate-bound PAHs in Taipei is79.93±5.49％；the catalyst-equipped and non-catalyst vehicles contributed39.42±3.10 ％ and 59.93±2.51％, respectively.