為了解台灣北部地區大氣及土壤中戴奧辛/呋喃之分部特性，本研究選定北部三處都市焚化爐周遭，進行大氣以及土壤的戴奧辛/呋喃採樣分析，並利用氣固相分佈模式、PM10與濃度關係及乾、濕沉降模式進行模擬，進一步得到大氣中戴奧辛/呋喃之氣固相分佈以及乾、濕沉降通量與濕沉降掃除係數。研究結果顯示，由特徵剖面可看出土壤中汙染物分別以1,2,3,4,6,7,8-HpCDD (3.57%) , OCDD (89.1%) 以及OCDF (3.35%) 等異構物所含的比例較高，其中又以OCDD (89.1%) 所含的比例為最高，且土壤中OCDD所含的比率也遠高於其在大氣中所含之比率，顯示了OCDD在環境中較不易被分解代謝的特性。於乾、濕沉降的研究中，可以發現氣候因子在討論乾、濕沉降時為一重要因子。降雨量以及降雨天數會影響了大氣中乾，濕沉降的分布比例。而季節與溫度的變化，含氯數的多寡與顆粒特性也會影響大氣沉降中的氣固相分布。此外，採樣分析時的人為誤差也可能會產生顯著的影響。大氣中的戴奧辛/呋喃特徵剖面是和土壤的特徵剖面相似的，最高的三種異構物也為1,2,3,4,6,7,8-HpCDD, OCDD以及OCDF ，但基於不同的異構物有不同的當量毒性，本研究將針對北台灣地區，以毒性當量的觀點來探討大氣及土壤中戴奧辛/呋喃的分布以及影響。研究結果顯示，台北地區的戴奧辛/呋喃的I-TEQ年平均溼沉降量介於在399-775 (pg I-TEQ/m2-year) 之間，由於固相掃除比例在溼沉降中占了很大的比例，戴奧辛的沉降通量在雨季時比在乾季時高出許多，因此每年的雨季分佈對戴奧辛年平均溼沉降有重大的影響。而在戴奧辛/呋喃的I-TEQ年平均總沉降中(乾+溼)，其值介於1.18-4.94 (ng I-TEQ/m2-year) 之間，其中濕沉降所占比例並不大(13.6-42.4%)，顯示出在戴奧辛/呋喃的I-TEQ年平均總沉降中(乾+溼)，乾沉降有顯著的影響。影響這些戴奧辛/呋喃的I-TEQ沉降的因子包含了季節的轉變、逆溫層的形成、境內燃燒、光化學反應以及其它化學反應。與之前的研究結果相比，本研究的資料顯示出北台灣區域性的戴奧辛/呋喃的I-TEQ沉降特性，可以在未來提供給決策管理者、相關研究等作為參考。

This study investigates the characteristics of polychlorinated dibenzo -p-dioxins and dibenzofurans (PCDD/Fs) in the atmosphere and soils of northern Taiwan. The ambient air and soils were collected seasonally in the vicinity of three municipal solids waste incinerators to determine the concentration of PCDD/Fs. Gaseous and particle concentrations were both obtained by measurement and simulation, and dry and wet deposition fluxes and scavenging ration were also developed. The PCDD/F congener profiles of soils show that 1,2,3,4,6,7,8-HpCDD (3.57%) , OCDD (89.1%) and OCDF (3.35%) were dominant among seventeen congeners and OCDD (89.1%) shows significant high fraction. Comparing the fraction of OCDD in the soils to that in the ambient air, OCDD also show higher value in the soils than in the atmosphere. This result refer that OCDD is more resistant in the environment than other congeners. In the study of dry and wet deposition, we could find that both rainfall and rainy days would determine which process – dry or wet deposition – is more important during the atmospheric deposition. Moreover, the temperature changes during the seasons, the difference in chlorine atoms of each congener and particle characteristics would also have impact to the gas and particle partitioning. Additionally, the artifacts during sampling work due to the adsorption and blow-off mechanism were supposed to be neglected. Due to the different toxicity of each congener, this study used the view of toxicity to find out the influences of PCDD/Fs in northern Taiwan. From this study, the annual PCDD/F-I-TEQ wet deposition in Taipei city ranged from 399-775 (pg I-TEQ/m2-year) during 2006 to 2011. Since wet precipitation is more valid in scavenging particulate PCDD/Fs, the fluxes of dioxins in rainy season are higher than those in dry seasons. Therefore, the distribution of rainy season in each year have significant impacts on annual wet deposition flux. And regard to the annual PCDD/F-I-TEQ total deposition (dry+wet) in Taipei city ranged from 1.18-4.94 (ng I-TEQ/m2-year) during 2006 to 2011. Wet deposition account for 13.6-42.4 % among annual total PCDD/F-I-TEQ deposition (dry+wet), revealing that the part of dry deposition shows Factors that might affect the PCDD/F-I-TEQ deposition fluxes were seasonal changes, formation of inversion layers, domestic heating, photolysis and chemical reactions. In comparison with previous studies, the data gain in this study showed the characteristics of PCDD/F in Taipei city and can provide reference to governors and further studies.

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