本研究以工業汙染源複合短期模式3(ISCST3)，針對燃煤火力發電廠周界大氣中氣相及固相之汞(水銀)進行調查。ISCST3擴散模式模擬為美國及台灣環保署所認可的擴散模式，該模式亦可探討擴散之汞於環境中之貢獻度。
本研究於此燃煤火力發電廠之周界中取5個周界大氣採樣點，並對汞濃度進行採樣。煙道排放之汞濃度平均為1549.3ng/Nm3，個別濃度介於614~2672ng/Nm3。此排放濃度相對其他主要汙染物來得低。周界大氣中之汞濃度介於2.48 至 4.13 ng m-3，平均為3.38±0.599 ng m-3。五點周界採樣點中， A點之汞濃度最低，為2.48±1.62 ng m-3， 相較之下，D點之汞濃度較高，為4.13±2.71 ng m-3。A點為於郊區， 而D點位於高地。D點濃度較A點來得高的原因是由於氣相之汞分子於高海拔地區較高。C點距燃煤火力發電廠最近，但汞濃度仍較D點為低。由ISCST3求得之汞濃度介於 0.0226±0.00650 ng m-3 及0.0135-0.0316 ng m-3， 而測得之汞濃度平均為3.24±0.575 ng m-3，介於2.39至 3.98 ng m-3，故模擬求得之汞濃度遠較監測值為低。
年度周界大氣中之汞濃度，由燃煤火力發電廠貢獻之比例為0.698%±0.164%。該廠對各周界採樣點之個別貢獻度為0.568%,0.783%,0.927%,0.523%和0.687%即便D點之汞濃度高，但火力發電廠僅對周界大氣做出了微小的貢獻。以上之結果顯示火力發電廠對周界大氣之貢獻量皆小於.1%。由於煙囪極高且排放濃度低，火力發電廠排放之汞對周界大氣測站只影響微乎其微。因此，火力發電廠並非周界大氣中汞濃度之主要貢獻者。

In this study, the annual concentration of gas and particle phase of Mercury (Hg) in the ambient site areas have been researched by using ISCST3 Dispersion Modeling. The ISCST3 dispersion modeling is one of the dispersion models trusted by USEPA and Taiwan EPA, which is able to further explore the dispersed contributed mercury concentration existing in the environment as well.
There were five typical ambient air sites in the vicinity of the coal-fired Power Plant (CFPP). Each ambient site has been measured for Hg concentrations. Hg concentrations, which is emitted from stack flue gases, were averaged at 1549.3 ng/Nm3 and ranged from 614 to 2672 ng/Nm3. This emission was relatively low, compared with other pollutants. Totally measured Hg concentration in the ambient air sites were ranged between 2.48 to 4.13 ng m-3, averaging 3.38±0.599 ng m-3. Among those 5 ambient sites, site A has a low Hg concentration content about 2.48±1.62 ng m-3, compared with site D which has a high Hg concentration (4.13±2.71 ng m-3). Site A is a suburban area and site D is a plateau area. Therefore, Hg concentration in site A was quite low, compared to that in site D. Because the gas-phase Hg was plenty in the high level atmosphere such as those existing in site D. Even though site C is closest to the power plant; however, it contains a lower Hg concentration than site D. Moreover, the Hg concentration obtained by the ISCST3 dispersion modeling was averaged 0.0226±0.00650 ng m-3, ranging from 0.0135-0.0316 ng m-3, compared to the total gaseous mercury (TGM) concentration at 3.24±0.575 ng m-3, ranging from 2.39 to 3.98 ng m-3, so the modeled Hg concentration was much lower than the measured values.
For the annual total Hg concentration fraction of ambient air, the partition contributed by the coal-fired power plant was found to be 0.698%± 0.164%, with the concentration fraction for each of ambient air sites A, B, C, D and E being 0.568%, 0.783%, 0.927%, 0.523% and 0.687%, respectively. Though site D contained a high measured concentration, however, the modeled Hg concentration shown that the coal-fired power plant only contributed a small amount of Hg to the ambient air. The above results revealed that all of the emission sources that contributed to the ambient air were lower than 1%. Due to the high stack height and low emission concentration, the Hg impact of the coal-fired power plant was insignificant for the impact assessment on the ambient air sites. Therefore, this indicates that the power plant was obviously not the major contributor of the Hg concentration onto the ambient air environment

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