Particle Size Distribution of PAHs in the Air of Automobile Garage

• Main Authors: Lin, Wei-An, 林威安
• Other Authors: Ta-Chang, Lin
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/84340445532628878895

碩士 === 國立成功大學 === 環境工程學系 === 84 === Due to poor ventilation, the air polluants in semi-closed garages are frequently accumulated during working hours, causing deteroration in the indoor air. Since some polycyclic aromatic hydrocarbons (PAHs) found in the automobile exhaust are known to be highly carcinogenic or mutagenic, their concentrations and particle size distributions in the indoor and outdoor air at garages are of great concern. In this study two automobile garages were chosen, their indoor and outdoor air were sampled simultaneously by two PS-1 samplers and amultiple-orifice uniform deposite impacter (MOUDI). The samples were Soxhletextracted and analyzed by aan HP-5890 GC/FID for 16PAHs. The results show thatboth the total suspended particulate and the total-PAHs inthe indoor air weredistinctly higher than the values at their surrounding. Inside both garages, the total-PAHs and the toxic PAHs on the fine particles (d<2.5um) and the TSPwere all higher than the outdoor values. On fine particles inside the garagesthe toxic PAHs were 44% higher than the outdoor values. TSP inside was only 9%above the outside air. Both patterns of particle size distribution inside andoutside air was polluted by PAHs diffused out from within the garages, Insidethe garages the mass median diameters (MMD) were smaller than 3um, meaning that PAHs resided on fine suspended particles.