| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系 === 93 === The influence of both MTBE and BTEX emissions from vehicle and industrial sources on the ambient air nearby the residents’ area was investigated. The MTBE and BTEX samples were collected from the five different sites in southern Taiwan. Sampling sites included the industrial areas, traffic intersection sites, night market sites, parking lots and one motor vehicle repairing plants in southern Taiwan. Charcoal tubes (ORBO-32,100 mg/50 mg) were used to collect air stream, and the GC/FID technique was applied to quantify the concentrations of both MTBE and BTEX.
Results showed in the industrial areas, both MTBE and BTEX concentrations at Lin-yuan and Ren-Wu had the highest concentration. At the traffic intersection sites, the concentrations of MTBE and BTEX were associated with the vehicle density. The highest concentration occurred at Minsheng’s intersection road. At the night market, the higher concentration occurred at Rui-Guan and Ping-Tung night market. At the parking lots, the lower concentration was at the C parking lot. For the motor vehicle repairing plant, the concentrations of MTBE and BTEX were higher during repairing
than non-repairing. MTBE and toluene had the highest concentration among the analysis compounds and for all sampling sites. This result showed that the level of MTBE and BTEX were mainly from the emissions of both traffic and industrial sources. MTBE and BTEX ratio averaged 11.8:2.7:9.3:1.0:3.5, respectively. T/B ratio ranged from 0.5 to 12.3. This result was associated with the photochemical ages of air parcel and the characteristics of emission sources. The correlation between MTBE and BTEX in all sampling sites were also explained by principal component analysis (PCA). For industrial areas, three factors were extracted. For traffic intersection, night market and parking area, only one factor was extracted. Two factors were extracted for motor vehicle repairing plant. In this study, except for motor vehicle repairing plant, the cancer risks exposured by MTBE and benzene were below the acceptable level of 1×10-5 and non-carcinogenic risk were below 1.0. This result reveals that the risk of exposurement for all sampling sites was acceptable in this study. However, the potential health risk at one motor vehicle repairing in plant this study during repairing time was high and, therefore, it might be worth to confirm the possible sources in the future.
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