多溴聯苯醚為存在多種環境介質中之有害空氣污染物，是全球性的熱門議題。本研究之目的為瞭解台灣南部地區大氣中多溴聯苯醚之分佈特性，分別選定一處工業區、兩處都會區以及一處郊區等三種不同性質之地區進行秋季及春季的大氣採樣分析。四個採樣區域在第一季(秋季)之大氣濃度介於67.3~102 pg/Nm3之間，而在第二季(春季)之大氣濃度則介於24.0~ 64.4 pg/Nm3之間，研究結果顯示秋季濃度皆高於春季達1.6至3倍。比較各區域間多溴聯苯醚大氣濃度，以都會區最高、工業區與郊區相近。此外，BDE-209在30種異構物中比例含量最高。本研究中針對多溴聯苯醚之氣固相分佈，同時討論實際測量值與模式計算值，並進而計算乾沉降通量。多溴聯苯醚固相百分比之實測值與模擬值分別為71.5 %及84.1 %，顯示其以固相形式存在台灣南部之大氣中。另外，比較實測值與模擬值之間的差異百分比結果，顯示採樣受吸附、吹斷機制等因素影響。在本研究採樣期間，大氣中二至八溴之多溴聯苯醚之粒子相比例介於29.4~39.3 %，九至十之多溴聯苯醚則介於93.2~94.9 %之間，這意味著多溴聯苯醚的固相比例與溴化數及分子量成正比。總乾沉降通量部分，秋天介於39.0~60.4 ng m-2d-1之間；春季則介於13.4~37.6 ng m-2d-1之間。乾沉降速度依照各溴數來呈現，秋季時介於0.014-0.761 cm s-1，平均為0.679 cm s-1；春季則介於0.015-0.766 cm s-1，平均為0.664 cm s-1。由此可知，多溴聯苯醚之乾沉降通量和乾沉降速度皆隨著溫度上升而降低。本研究之成果，將對台灣大氣中多溴聯苯醚的背景建立有所貢獻。並可作為環保單位針對大氣中多溴聯苯醚之管制議題，訂定防治措施以及管制決策時之參考，提供進一步研究之寶貴資訊。

Polybrominated diphenyl ethers (PBDEs) are hazardous air pollutants (HAPs) and omnipresent in environmental media nowadays, the pollution of PBDEs becomes a globally hot issue.
The aim of this study was to investigate the characteristic of PBDEs in the ambient air of southern Taiwan. The ambient air was collected around four areas including industrial, urban-A, urban-B, as well as rural area during fall (21.3-23.3 oC) and spring (24.4-26.8 oC). For fall in turn at the areas by above order, the mean PBDEs concentrations in the ambient air were 67.3, 102, 101 and 71.7 pg/Nm3, respectively. As for spring the mean PBDEs concentrations were 40.8, 57.6, 64.4 and 24.0 pg/Nm3, respectively. The results above showed that atmospheric PBDEs concentrations were higher in fall than in spring ranged from 1.6-3.0 times. Besides, the highest level was found in urban area, while the level of industrial was close to rural area. Moreover, BDE #209 (10-Br) was the dominant congener of PBDEs at all sampling areas.
Gaseous and particulate concentrations were obtained by measured and simulated data. The dry deposition flux of PBDE were perceive as well. The particle-phase Σ30PBDE dominated the partition in both measured and simulated data with an average of 71.5, 84.1 % respectively. The percentage of difference between measurement and simulation revealed that sampling affect by adsorption and blow-off mechanisms, etc. The particle-phase partition by simulation was ranged from 29.4-39.3 % and 93.0-94.5 % of Σ2-8 Br BDEs and Σ9-10 Br BDEs congener, respectively. Thus, we could know the particle-phase PBDEs contributed minor in lowly brominated congeners and major in highly brominated congeners. The total dry deposition fluxes of PBDEs in fall (39.0-60.4 ng m-2d-1) were higher than in spring (13.4-37.6 ng m-2d-1). The dry deposition velocities of PBDEs in fall (0.014-0.761, avg.= 0.679 cm s-1) were higher than in spring (0.015-0.766, avg.= 0.664 cm s-1). That demonstrated that the dry deposition flux and velocity of PBDEs decreased as the temperature increased. All above results obtained from this study will provide helpful information for establishing the data base of atmospheric PBDEs in Taiwan.

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