本研究測量於臺南市成功大學區域連續採樣之大氣與雨水中之氣溶膠的碳、氮元素，觀察隨時間之變化探討其對空氣品質變化的環境地球化學意義。碳、氮濃度的測量方法為以TOC/TN 分析儀進行高溫燃燒分析法，碳測量所採用的檢測法為非分散式紅外線檢測；氮測量則是使用化學發光法。所採樣之氣溶膠，通過抽氣過濾的方式，以幫浦抽入空氣經過兩層不同孔隙之玻璃纖維濾紙1.6 μm及0.7 μm後通入定量的蒸餾水中。每次採樣時間為一周。在樣本進入儀器量測之前，會將乾沉降樣本置入蒸餾水中震盪離心，分離出可溶相及不可溶相。觀察在不同粒徑下的氣溶膠以及可溶相和不可溶相之碳-氮比值分布情形。雨水樣本則採樣自然降雨後直接進入儀器測量。
結果顯示，1.6 μm氣溶膠樣本大氣中平均濃度為4.01 - 10.73 ppm，而0.7 μm氣溶膠樣本平均濃度為1.24 - 4.42 ppm。1.6 μm、0.7 μm及奈米氣溶膠之碳濃度分別為 39.63 - 112.99 ppb、33.75 - 98.67 ppb及20.07 - 51.05 ppb；而氮濃度則為5.77 - 21.32 ppb、6.31 - 32.99 ppb及3.88 - 22.39；碳-氮比值為 5.21 - 6.87、2.95 - 5.35及1.97 - 5.17。雨水中碳濃度為0.15 - 12.99 ppm，氮濃度為0.30 - 11.21 ppm，碳-氮比值為0.53 - 9.36。
氮主要富集於小粒徑的氣溶膠中，主要來源於汽機車排放氮氧化物廢氣形成之次生顆粒，而0.7 μm及奈米氣溶膠對於碳、氮濃度亦擁有不能忽視之貢獻。臺南地區之碳、氮濃度呈冬高夏低的趨勢，主要受到混合層高度及雨水移除效應的影響。氣溶膠之碳-氮比值主要受到次生顆粒所影響，而混合層高度、降雨頻率及風力皆會影響次生顆粒的生成能力。隨季風所帶來的氣團來源，也會造成氣溶膠組成有季節上的差異。

In this study, we measured the carbon and nitrogen concentrations in aerosols and rainwater collected at Cheng Kung University in south Taiwan and observed the changes over time to explore the changes of the air quality.
We separated aerosols with glass fiber filter papers into size ranges of > 1.6 μm, 1.6-0.7 μm and nano-particle. Using a TOC/TN analyzer, we measured the concentration of carbon and nitrogen, and then calculated the carbon-nitrogen ratio. The values of the carbon-nitrogen ratio were highly related to the secondary particular matter formed in aerosols. The generation of secondary particular matter is controlled by (1) emission source, (2) mixed layer depth, (3) precipitation and (4) residence time of aerosols.
The results showed that the concentrations of carbon in the > 1.6 μm, 1.6-0.7 μm and nano-particle fractions were in the ranges of 39.63 - 112.99 ppb, 33.75 - 98.67 ppb and 20.07 - 51.05 ppb, respectively, whereas those of nitrogen were 5.77 - 21.32 ppb, 6.31 - 32.99 ppb, and 3.88 - 22.39, respectively with carbon/nitrogen ratios of 5.21 - 6.87, 2.95 - 5.35 and 1.97 - 5.17, respectively.
Nitrogen was generally enriched in the secondary particular matter, which was mainly composed of nitrogen oxides from vehicles emission. The concentrations of carbon and nitrogen was higher in summer than in winter. This feature can be explained by the variation in the altitude of the mixed layer and the effects of monsoon. The nitrogen in the secondary particular matter is highly soluble; therefore, subjected to rainwater removal. High carbon/nitrogen ratios were caused by decreasing nitrogen oxides in atmosphere. Lower carbon/nitrogen ratios indicated more secondary particular matters in aerosols.

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