| Summary: | 碩士 === 國立成功大學 === 環境醫學研究所 === 92 === The objectives of this study were set out to assess the concentrations of polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs) in workplace, and characterize engine exhaust period aircraft maintenance and testing. Then we assessed exposure risk for worker and estimated emission factors from exhaust of UH-1H aircraft turboshaft engine. On the part of environment monitoring, we collected PAHs, VOCs and aerosol size segregation samples from the engine testing room during both stages of engine of pre-testing and post-testing, respectively. On the part of aircraft emission assessment, we collected stack flue gas samples through isokinetic sampling during the 5 modes of GI（Ground Idle）, FI（Flight Idle）, BBC（Beed Band Check）, IGV（Inlet Guide Vane）, and TO（Take Off）, respectively. We found that significant difference of total PAHs levels between pre-testing stage (4635 ng/m3) and post-testing stage (24027 ng/m3) in testing engine room, but total VOCs levels are higher in pre-testing stage (121 μg/m3) than in testing stage (89.9 μg/m3). The estimated lung cancer risk range caused by PAHs for aircraft maintenance workers period work were 1.98×10-3 ~4.18×10-3. The range of risk caused by Benzene was 5.76×10-6~1.12×10-5. The result of size distribution showed that particles were dominated by the fine fraction at both pre- and post-testing stage. Stack sampling results revealed that the average PAHs concentration was 843（μg/m3）at 5 testing modes. The PAHs emission factor of aircraft of turboshaft engine was higher than gasoline engine. Total emission factors of total-PAHs and BaP as the landing and takeoff（LTO）cycle were 21.8（g/LTO）and 42.5（mg/LTO）, respectively. PAHs level of gas phase was the major composition because high temperature resulted in that particle was burned down what it followed raising of the rotation rate. Emission factor of total-VOCs as the LTO cycle were 873（g/LTO）.
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