| 研究生: |
李明杰 Ming-Chich Li |
|---|---|
| 論文名稱: |
近地表臭氧前驅物分析之前濃縮技術改良 n |
| 指導教授: |
王家麟
J-L Wang |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學學系 Department of Chemistry |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 93 |
| 中文關鍵詞: | 揮發性有機化合物 、前濃縮 、臭氧前驅物 |
| 外文關鍵詞: | Preconcentration, VOCs |
| 相關次數: | 點閱:9 下載:0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
摘要
本研究針對有機揮發氣體自動化分析系統之吸附機制進行硬體上的改良,在縮減硬體設備支出的同時,更提高了整體系統的解析度,使系統達到極佳的分析效果,同時縮短分析時間。
其中針對高揮發性物種之冷凍捕捉機制,改良方式是以一氣冷散熱模組取代現有之冷卻水循環冷系統,同時縮小乾燥室之體積,使系統在降溫捕捉時,周圍空氣中的水氣凝結不致影響致冷晶片動作與壽命,並使用一體成形之吸附管取代氣動機械汽缸系統,使吸附管不會因為來回移動而受損鬆脫,增加系統元件之可靠性,並在此改良之系統下獲取更穩定的分析數據。
而快速熱脫附技術部份則以非回饋之時序與脈衝輸出來控制驅動加熱絲之110VAC電源,藉此快速加熱吸附管完成熱脫附程序,此技術取代了以溫度程序控制器搭配直流變壓器之熱脫附模式,不但省略了溫度程序控制器與變壓器造成的種種負擔,更成功地大幅提升解析度,進而在不損解析度的分析條件下完成快速分析的目標。
本實驗之兩系統所使用的吸附管皆為內徑較小之不銹鋼管且消除非必要之轉接點,有效地降低分析物因無益體積(dead volume)所造成之縱向擴散(longitudinal diffusion),使本實驗在非甲烷碳氫化合物分析上擁有足以媲美大部分商業化系統之解析度或偵測極限。
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