| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 101 === In Houli Central Taiwan Science Park (CTSP), eighteen VOC species, acid gases, and ammonia were measured at four surrounding sites. The concentration of total VOCS, TVOC, was 14.32 – 35.09 ppb, among which alkane was dominant (52.9%), followed by aromatics (29.4%), and carbonyls (17.6). The toluene to benzene ration was 14.8 – 18.9.
Only sulfate acid was detected in the surrounding air, with the concentration of 3.31 – 6.65 μg/Nm3 below the regulation 50 μg/Nm3. The concentration of ammonia (NH3) was 0.037 – 0.24 ppm, contributed mainly by the farmlands, and minor from industrial sources.
Principal component analysis (PCA) identified two factors associated with VOC sources, namely semiconductor processes, mobile sources, gas stations; and organic solvent usage.
The health risks of benzene, ethylbenzene, and dichloromethane were evaluated. Total lifetime cancer risk was 5.0E-07 to 6.0E-06 using USEPA slope factor, and was 9.4E-07 to 1.0E-05 using Cal. EPA slope factor. Also, cancer risk was estimated above 1.0E-06 for an 8-hour worker with 10 – 30 years exposure condition.
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