大氣中氣態汙染物大部分為酸性氣體，如硫酸、硝酸及亞硝酸，而氨氣在大氣中則扮演一個相當重要的鹼性氣體，而硝酸銨及硫酸銨為台灣PM2.5中的主要物質，故能正確量測形成這些汙染物的前驅物”氨氣”就是相當重要的課題。
本研究預期比對人工採樣以及連續自動監測儀的差異，手動採樣的部分利用同心圓管氣固分離器收集周界中的氨氣；而連續自動監測儀則以本研究自行設計的氨氣轉化器搭配NOx連續自動監測儀。人工採樣的部分塗敷檸檬酸的同心圓管對氨氣在700 μg的收集量內有90%的收集效率；而塗敷碳酸鉀的同心圓管對亞硝酸、硝酸的吸附量分別在20 μg、55 μg以內有90%收集效率。自動監測數據的部分使用兩組大小不同的轉化管柱，並分別測試轉化溫度以及停留時間對氨氣轉化率的影響。
連續比對結果人工採樣數據皆略高於自動監測儀數據，平均分別為7.6 ppbv與15.3 ppbv，造成此差距的原因可能是周界中的一氧化氮和尚未氧化為NOx的氨氣產生反應生成氮氣，而由結果可發現數據差值越大的日期該筆的一氧化氮濃度也會相對較高。

Most of gaseous pollutants in the atmosphere are acid gases, such as sulfuric acid, nitric acid and nitrous acid, while ammonia is an important alkaline gas in the atmosphere. Ammonium nitrate and ammonium sulfate are the main material of fine particle in Taiwan; therefore, to measure ammonia correctly which is the precursor pollutant of the ammonium nitrate and ammonium sulfate is a very important issue.
This study expect to compare the differences between manual sampling and continuous automatic monitor. In the manual sampling method, we used the annual denuder to collect ammonia; on the other hand, we designed an ammonia converter to equip with the NOx continuous automatic monitor. We will coat two kind of agent in different denuders, one is citric acid and the other is potassium carbonate. For denuder coating citric acid, if the ammonia adsorption capacity is under 700μg, the collection efficiency can exceed 90% and for denuder coating potassium carbonate, if the nitrite and nitrate adsorption capacity is under 20 μg and 50 μg, the collection efficiency can exceed 90%. In automatic sampling method, we used two different size tubes to convert the ammonia gas. Besides, we use different temperature and residence time to see how these two factors will affect the ammonia conversion.
The comparison result shows that the manual sampling data are slightly higher than the continuous monitoring data, the average concentration was 15.3 ppbv and 7.6 ppbv. The reason cause this disparity may be due to the chemical reaction of nitric oxide and ammonia, this reaction will consume the nitric oxide and ammonia to produce the nitrogen. From the comparison results, we can find that the greater the differences between the data in that date, the nitric oxide concentrations will be relatively high.

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