本研究目的為了解台灣北部焚化廠周界大氣中PCDD/Fs之濃度、氣固相分佈特徵以及乾沉降通量，分別自2006年至2011年針對台灣北部三座焚化廠周界地區進行大氣PCDD/Fs濃度之採樣調查，每座焚化廠附近皆選取7處作為採樣點，一次採樣共計21個空氣樣品進行17種PCDD/Fs異構物分析。
從特徵剖面I-TEQ固相濃度來看，以2,3,4,7,8-PeCDF所占比例最高，其次為1,2,3,4,7,8-HxCDF及 1,2,3,6,7,8-HxCDF；若以特徵剖面I-TEQ氣相濃度來看，亦以2,3,4,7,8-PeCDF所佔比例為最高，其次為 2,3,7,8-TeCDD/F及 1,2,3,4,7,8-CDD。進一步研究大氣中氣固相濃度所佔總PCDD/Fs之I-TEQ濃度之比例，發現固相濃度所佔比例以一月(46.7%)、二月(45.0%)及三月(45.6%)為最高，而氣相濃度所佔比例以六月 (87.6%)及八月(87.4%)所佔比例為最高。由2006年至2011年，六年間固相濃度所佔總PCDD/Fs-I-TEQ濃度比例為25.8%至32.0%(平均28.1%)，而氣相濃度所佔總PCDD/Fs-I-TEQ濃度比例則為68.0%至74.2%(平均71.2%)
乾沉降通量部分，PCDD/Fs-I-TEQ乾沉降均以粒狀物相沉降為主，所佔比例從87.0% 至 98.3%，平均 94.2%。模擬之逐月PCDD/Fs-I-TEQ乾沉降通量範圍為0.102 ng-I-TEQ/m2-month (三月)至0.307 ng-I-TEQ/m2-month (六月)；模擬之逐年PCDD/Fs-I-TEQ乾沉降通量範圍為1.352 ng-I-TEQ/m2-year 至 2.766 ng-I-TEQ/m2-year，其中2009年及20111年有顯著較低之乾沉降通量，可能由於相對較低之PCDD/Fs採樣濃度所導致。平均年乾沉降速度為0.403cm/s至0.506cm/s，無顯著差異之可能原因為六年間之溫度及TSP濃度變化並不大。此研究提供有關大氣中PCDD/Fs行為之探討，可供未來PCDD/Fs相關控制政策制定上之參考。

The objectives of this study were to know the concentration, gas-particle partitioning properties, and dry deposition process of PCDD/Fs in the ambient air in northern Taiwan. During each sampling period from 2006 to 2011, 21 sampling sites, with maximum ground concentration of PCDD/Fs from the emission of each MSWI found by ISCST model, near three municipal solid waste incinerators located in northern Taiwan were selected. Air samples were analyzed for specific 17 PCDD/F congeners, and the protocol for QA/QC is strictly followed.
From congener profiles of PCDD/Fs-I-TEQ in particle phase, the 2,3,4,7,8-PeCDF was the most predominant congener and follow by 1,2,3,4,7,8-HxCDF and 1,2,3,6,7,8-HxCDF. For PCDD/Fs-I-TEQ in gas phase, the 2,3,4,7,8-PeCDF was most dominant one and followed by 2,3,7,8-TeCDD/F and 1,2,3,4,7,8-CDD. For the gas-particle partitioning properties of total PCDD/Fs-I-TEQ, the highest percentage of particle phase occurred in January (46.7%), followed by February (45.0%) and March (45.6%), and the highest percentage of gas phase occurred in July (87.6%), followed by August (87.4%). For the phase distributions of total PCDD/Fs-I-TEQ in six years, the percentage of particle phase ranged from 25.8% to 32.0%, with an average of 28.1%, and the percentage of gas phase ranged from 68.0% to 74.2%, with an average of 71.2%. There was no significant difference among each year.
Mean fraction of PCDD/Fs-I-TEQ dry deposition flux contributed by the particle phase were between 87.0% and 98.3%, and averaged 94.2%. The above results displayed that the particulates is the predominant factor controlling the PCDD/F dry deposition flux in the atmosphere. Modeled mean monthly dry deposition of PCDD/Fs-I-TEQ ranged from 0.102 (in March) to 0.307 ng-I-TEQ/m2-month (in June), probably due to the higher TSP concentration in March and fewer sunny days in summer.
Modeled yearly mean dry deposition of PCDD/Fs-I-TEQ ranged from 1.352 to 2.766 ng-I-TEQ/m2-year, with the significantly lower value in 2009 and 2011, may because of relatively lower PCDD/Fs concentrations. Mean yearly dry deposition velocities of PCDD/Fs-I-TEQ in six years were 0.403 - 0.506 cm/s. Both temperature and TSP concentration were similar during 2006-2011, therefore, the dry deposition velocity in each year was very close. This study provides useful information for looking more inside on the behavior of PCDD/Fs in the ambient air, which is a great benefit for establishing good strategy for the PCDD/Fs control.

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