臺灣博碩士論文加值系統

本研究目的在於偵測台北都會區大氣中的半揮發性正烷類 (n-alkanes,
C15-C36 ) 的濃度，及其在氣相與微粒相之間的分佈。進而探討大氣氣懸
微粒所含正烷類的碳數分布與污染源間的關係，以及季節所造成的影響。
本研究使用的採樣器為Model PS-1 PUF Sampler ( Graseby GMW ) ，其
採樣流量為200 lpm。採樣頭上層以石英纖維濾紙攔截總懸浮微粒 ( TSP
)，而下層則以 PUF及XAD-2吸附氣相中的半揮發性有機成分。每季密集採
樣六天，從1996年六月起至1997年三月止，分別採集春夏秋冬四季之樣本
。每次採樣時間為24小時，採得樣本以索氏萃取器進行萃取後，用GC /
FID做定性及定量分析。研究結果顯示，台北都會區的氣懸微粒所含碳15
~ 36之碳數分佈範圍內之半揮發性正烷類，總濃度範圍在9.5 ~ 236.8
ng/m3 之間。蒸氣相所含正烷類總濃度範圍則在0.27 ~ 5.38 mg/m3 之間
。氣固相分布的的結果顯示氣溫及正烷類的碳數對正烷類在蒸氣相及微粒
相的分佈有明顯的影響。根據微粒排放源的追蹤指標，顯示四季的樣本均
有來自石化燃燒排放及當代生物排放源的貢獻，但皆以石化燃燒排放為主
要貢獻源。

The primary objective of this study is to determine the
concentration of semi-volatile n-alkanes (C15-C36) in the Taipei
aerosol and their distributions between gaseous and particulate
phases. The distribution profile of n-alkanes was used to
examine the significance of various. The seasonal changes of
semi-volatile n-alkanes in the Taipei aerosol was also
investigated. We used quartz fiber filters mounted in a Model
PS-1 PUF Sampler (Graseby GMW) to collect samples of total
suspended particulate (TSP). The n-alkanes in gaseous phase
were adsorbed by PUF and XAD-2 inserted in a cartridge and
attached downstream of the filter holder of the sampler. The
samples were collected at a flowrate of 200 lpm for a 24 hr
duration. The n-alkanes collected on filters, PUF and XAD-2
were extracted with CH2Cl2 in a Soxhlet extraction apparatus.
Qualitative and quantitative analyses of the n-alkanes were
carried out by GC/FID. The results of analysis for aerosol
samples, obtained in four sampling periods between June 1996 to
March 1997 at Chung Shan Elementary School in the city of
Taipei, show that the concentration of particulate total n-
alkanes ranged from 9.5 to 236.8 ng/m3, and that of gaseous
total n-alkanes ranged from 0.27 to 5.38 mg/m3. The vapor-to-
particle ratio of n-alkanes depends on the ambient tempurature
and the carbon number. The distribution profile and values of
other indices of n-alkanes in the Taipei urban area show that
they mainly come from emission of motor vehicles