The Ambient Characteristic Profiles and Size Distributions for Polycyclic Aromatic Hydrocarbons at Industrial and Traffic source.

• Main Authors: Mou-lung Jiang, 莊茂隆
• Other Authors: Yee-lin Wu
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/26869476094113607859

碩士 === 國立成功大學 === 環境工程研究所 === 83 === In order to evalute the differences of characteristic profiles of PAHs between industrial sources and traffic sources , similar sampling schemes were conducted at vehicle and motorcycle tunnels . The results show that the order of the concentrations of total PAHs is motorcycle tunnel (19870ng/m3) > industrial area(789ng/m3) > suburban area (775ng/m3) > town area (676ng/m3).The greater concentrations in the suburban area than those at the town area are due to the large values of NaP concentration in the suburban area.The fraction of particulate PAHs is motorcycle tunnel(54%) > Vehicle tunnel(31%) > town area(12%) > industrial area(10%) >suburban (8%). This is , More fraction is in particulate phase for PAHs emitted from traffic sources . The histograms of size distributions measured with MOUDI were converted tolog-normal distributions with the Twomey algorithm . The results show that the size distributions of individual PAHs are multi-modes: two modes for dp < 1 μ m and one to three modes for dp > 1 μ m. Most of the particulate PAHs at the motorcycle tunnel are with diameter less than 1μm and the percentages are greater than 90%. However , the results measured at other sites show significant different patterns sampling sites. The mass median aerodynamic diameters of each PAHs compounds are vehicle tunnel (1.61 ± 1.07μm) >industrial area (1.19± 0.41μm) > suburban area (0.75 ±0.45μm) > motorcycle tunnel(0.48 ± 0.33μm). Emission rates of total PAHs are 1.872mg/km for motorcycle. According to the ratio of concentrations for VOCs in motorcycle tunnel and vehicle tunnel, the emissions rates for vehicle are 1/10 to 1/100 times compared with motorcycle.