台北都會區居民之戴奧辛暴露風險評估 之研究
Date Issued
2005
Date
2005
Author(s)
羅培倫
DOI
zh-TW
Abstract
This research takes Taipei City as the range of study. First we calculate the annual PCDDF/s emission of sources around Taipei City, then we use ISC-ST3 (Industrial Source Complex-Short Term model 3) gaussian diffusion model to simulate the dispersion of PCDD/Fs air concentration and total depostition. Base on the simulation results, we calculate resident’s annual carcinogenic risk increment due to PCDD/Fs exposure of inhalation and dietary intake. In this study we also confer the change of resident’s PCDD/Fs exposure risk by reducing of specific emission sources.
Taipei’s annual PCDD/Fs emission in 2003 is 0.992 g I-TEQ/yr, in which 62.7% is emitted by MSWIs, 17.9% by crementory, and 19.4% by mobile sources. The three year average PCDD/Fs air concentration and total deposition simulation result is 1.17 fg I-TEQ/Nm3 and 6.85 ng I-TEQ/Nm3, while both of the maximum results fall into Daan district. In scenario one, which we take the actual local dietary production into account, the average annual carcinogenic risk increment is 1.29×10-7, in which dietary exposure is 64.1% and inhalation exposure is 35.9%, while grain, below ground vegetables and pork are the three main sources of exposure. In scenario two, we assume the food which residents eat were all produced inside Taipei City, the average annual carcinogenic risk increment is 2.07×10-5, in which dietary exposure is 99.78% and inhalation exposure is 0.22%, while grain, chicken and fish are the three main sources of exposure.
In the case study of reducing PCDD/Fs emitted from Taipei Crementory, while the emission decreased by 87%, residents’ average inhalation exposure risk increment decreased by 20.9%, which Daan district, Zhongzheng district and Xinyi district decreased most; residents’ maximum inhalation exposure risk increment decreased by 77.5%, which Daan district, Wenshan district and Zhongzheng district decreased most. This result shows that reducing Taipei Crementory’s PCDD/Fs emission would have great influence on residents’ decrease on PCDD/Fs exposure risk.
Subjects
戴奧辛
風險評估
ISC 模式
dioxin
risk assessment
ISC model
Type
thesis
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