本研究旨在建立一個簡單且可靠的分析方法來檢測在降水（雲及雨）環境中多環芳香烴的濃度。吾人於2001年1月9日到2月25日在陽明山區收集雲水；而雨水則在2000年12月13日於台北盆地所收集的。降水樣品首先定量成1000毫升，過濾後利用固態萃取法萃取，濃縮後進入氣相層析質譜儀（GC/MS）來在檢測降水中多環芳香烴在水樣的濃度，回收率介於70~90﹪之間。另外，過濾後的濾膜利用超音波震盪器進行萃取，濃縮後進入氣相層析質譜儀以檢測多環芳香烴在微粒中的濃度，回收率介於70~90﹪之間。結果發現在天氣型態的改變、氣團來源的不同均會影響雲水內多環芳香烴的濃度和組成。雨水中在水樣方面濃度最高的多環芳香烴為Naphthalene，最高可達230 ng/L，在微粒方面濃度最高的多環芳香烴為Naphthalene，最高可達774 μg/g，總多環芳香烴的濃度最高可達504 ng/L；雲霧水中在水樣方面濃度最高的多環芳香烴為Naphthalene，最高可達135ng/L，在微粒方面濃度最高的多環芳香烴為Pyrene，最高可達935 μg/g，總多環芳香烴的濃度最高可達4599 ng/L。並且可發現雲水內的多環芳香烴多以吸附在微粒方面存在，而雨水內的多環芳香烴多存在於水樣中。 The purpose of this study is to establish a reliable and a simple analysis method in order to examine the concentration of Polycyclic Aromatic Hydrocarbons (PAHs) in precipitation (cloud water and rain water). Rainwater was collected in Taipei Basin in 12/13/2000 and the cloud water was sampled at Mt. Bamboo from 01/09/20001 to 02/25/2001. After filtration, the sample of fixed 1000ml was extracted using Solid phase extraction, and then concentrated for PAHs analysis by GC/MS. The recovery rate is between 70% and 90%. In addition, Supersonic extraction was applied for particles. The recovery was also between 70% and 90%. It was found that PAH concentrations and components were associated with weather patterns and the origins of air mass .For rainwater, the dominant PAH in liquid phase is Naphthalene, and it can reach as high as 230ng/l, whereas for particle phase, the dominant PAH is also Naphthalene, having the highest concentration of 774 μg/g. In total, it can reach 504 ng/L. For cloud water, the dominant PAH was Naphthalene and Pyrene for liquid and particle phases, and they can reach 135 ng/L and 935 μg/g, respectively. The total PAHs concentration can reached 4599 ng/L. Most PAHs of cloud water were found to particle phase, while in liquid phase for rainwater.
