大氣醛酮類化合物是臭氧、二次有機氣溶膠 (SOA) 和光化學產物的前驅物。 經由在臺灣中部海拔 2862 公尺高的鹿林山大氣背景觀測站(LABS)連續採樣與分析 以了解醛酮化合物日夜變化的濃度分布，連續採樣時間為 2 天，每天早上 8 點到下 午 4 點進行 2 小時採樣一次。本研究根據美國環境保護署(US EPA)TO-11A 標準方 法，採用 Supelco Lp-DNPH 商業化吸附匣，搭配高效能液相層析儀-紫外光/可見光 偵測器 (HPLC-UV)量測大氣中 15 項醛酮化合物濃度分布.
研究結果顯示採樣期間最主要醛酮化合物為丙酮，第一天與第二天平均濃度 分別為 0.45 ppbv 與 0.33 ppbv，;其次是甲醛和乙醛，第一天平均濃度為 0.29 ppbv 和 0.22 ppbv，第二天平均濃度為 0.11 ppbv 與 0.08 ppbv。日夜變化中，最高值出現 在下午 2 點，可能原因為山上光化學反應生成二次醛酮化合物，與日間地面上山風 將一次污染物從山下往山上傳輸，到達山頂時生成二次醛酮化合物。此外，第一天 所有空氣污染物濃度都高於第二天，包含醛酮化合物、揮發性有機物(VOCs)、細懸 浮微粒(PM2.5)、臭氧(O3)和一氧化碳(CO)等，研究結果顯示第一天境外傳輸時主要 污染源來自於東亞;第二天無境外污染，主要為本地傳輸，污染物濃度為典型高山 背景站現象。本論文為臺灣首次高山背景觀測站醛酮類濃度分布調查，與境外、本 地傳輸時各項空氣污染物差異與研究。

Atmospheric carbonyls are precursors of ozone, secondary organic aerosols (SOA) and photochemical products. Field sample collections at Lulin Atmospheric Background Stations (LABS) in Lulin mountain at an altitude of 2862 m ASML in Nantou, central Taiwan, were conducted to understand the diurnal variations of carbonyls in background atmosphere. The sampling was performed every 2 hours on 2 consecutive days to study diurnal variations, starting from 8 am to 4 pm. Supelco Lp-DNPH commercial cartridges based on the United States Environmental Protection Agency (US EPA) TO-11A method was used to analyze the mixing ratios of fifteen target carbonyl compounds in the atmosphere by high performance liquid chromatography with UV detection (HPLC-UV).
Acetone is the most dominant species on both days with the mixing ratios of 0.45 ppbv for the first day and 0.33 ppbv for the second day, followed by formaldehyde and acetaldehyde of 0.29 ppbv and 0.22 ppbv, respectively, on the first day, and 0.11, 0.08 ppbv, respectively, on the second day. The early afternoon (2 PM) concentrations had the highest concentrations on both days, presumably because the significant influence of photochemical reactions and the transport from the urban areas down below due to the upslope winds in daytime. In addition, the mixing ratios of all carbonyl compounds on the first day were higher than on the second day, so were other pollutants such as VOCs, PM2.5, and CO, suggesting a common mechanism to produce the similar diurnal profiles at LABS.

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