本研究主要目的在建立大氣奈米微粒採樣技術，並藉現場調查探討奈米微粒粒徑分佈及無機鹽類組成特徵，採樣系統為MOUDI與Nano- MOUDI組合以取得大氣奈米微粒分徑樣品，於設計流量下可分為10~ 18、18~32、32~56、56~100 nm等範圍，收集之微粒以六位數天平及IC分析其重量濃度及無機鹽類成份，包含Cl-、SO42-、NO3-、NH4+、Na+、K+、Mg2+、Ca2+等組成特性。
　　考慮濾紙最小増重及IC偵測極限，推估採樣時間為48小時。濾紙採樣前後於溫度17±1℃、相對溼度40±3%環境中秤重，所得56~100 nm奈米微粒重量濃度最大誤差為0.020μg/m3，10~56 nm為0.059μg/m3。
　　研究結果顯示，潮州地區大氣奈米微粒重量濃度濃度為1.29~4.62μg /m3，與PM1、PM2.5、PM10之比值為3.0~8.3%、2.2~6.1%、1.7~4.9%；大寮地區大氣奈米微粒重量濃度濃度為1.17~3.15μg/m3，與PM1、PM2.5、PM10之比值為2.9~8.5%、2.1~6.1%、1.5~4.2%，大氣奈米微粒重量濃度與PM1、PM2.5、PM10重量濃度間相關係數僅0.24、0.21、0.16，PM污染事件日發生係由細微粒濃度增加所引起。將所得結果繪製粒徑分佈圖，大多呈現典型三峰分佈，其中奈米微粒MMD介於16~49 nm間。
　　化學分析結果，大氣奈米微粒無機鹽類組成中，SO42-含量最高，佔約8.0%、其次為NH4+(5.4%)、NO3-(3.9%)，Na+、K+、Mg2+、Ca2+、Cl-等總和佔約4.6%，而未分析之成份則佔78.1%，其中SO42-、NH4+、NO3-易受環境因素而改變含量，而其總含量隨奈米微粒重量濃度增加而減少，顯示奈米微粒受未分析成份影響較大。以SOR/NOR探討不同粒徑硫及氮轉化成粒狀物現象，顯示硫酸鹽及硝酸鹽之轉化成主要發生於0.18~1.8μm間。

　　This research used a sampling system , composed of MOUDI and Nano- MOUDI , has been applied to take nanoparticles into four groups (10~18、18~ 32、32~56、56~100 nm). The filter was weighed by a ultra-micronbalance . The components were analyzed by IC for identifying the components of Cl-、SO42-、NO3-、NH4+、Na+、K+、Mg2+、Ca2+ .
　　In this study , the mass concentration of nanoparticle at Chao-Chou station was 1.29~4.62μg/m3 , the values of nano-PM/PM1、nano-PM/PM2.5 and nano-PM/PM10 were 3.0~8.3%、2.2~6.1% and 1.7~4.9% , respectively . The mass concentration of nanoparticle in Da-Liao station was 1.17~3.15μg /m3 , with the ratio of nano-PM /PM1、nano-PM /PM2.5 and nano-PM/PM10 were 2.9~8.5%、2.1~6.1% and 1.5~4.2% , respectively . The correlation of mass concentration between nano-PM and PM1、PM2.5、PM10 was poor . PM episode days were result from the raise of fine particle mass concentration . Size distribution figure shows that atmospheric particles present three mode , the MMD of nanoparticle was 16~49 nm .
　　The data shows that SO42- was the most abundant component which constitutes 8.0% of the nanoparticle mass , The other dominant species include NH4+(5.4%) and NO3-(3.9%) . Non-analysed species were approximate 78% . It shows that the inorganic species were not the key component in the nanoparticles .
　　The SOR/NOR to discuss the property of gas-to-particle conversion of particle that have different diameter . The main conversion of sulfate and nitrate were take place at the diameter ranged from 0.18 to 1.8 μm . Though the surface area of nanoparticles were very large , the conversion of sulfate and nitrate were a little .

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