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題名 | 自動熱脫附氣相層析質譜法分析大氣環境中揮發性有機化合物之研究=The Study of Volatile Organic Compounds in Ambient Air by Automatic Thermal Desorption/GC/MS |
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作者 | 羅中恆; 吳瀧川; | 書刊名 | 明志技術學院學報 |
卷期 | 33 2001.06[民90.06] |
頁次 | 頁139-150 |
分類號 | 445.63 |
關鍵詞 | 揮發性有機化合物; 自動熱脫附; 大氣環境; 氣相層析/質譜法; Volatile organic compounds; Automatic thermal desorption; Ambient air; Gas chromatography/mass spectrometry; |
語文 | 中文(Chinese) |
中文摘要 | 大氣環境中揮發性有機化合物的來源主要可分為移動性污染源(如汽、機車排放 之廢氣)與固定性污染源(如工廠煙囪排放之廢氣)。因此,有效降低這兩種排放源是改善 空氣品質的重要關鍵。然而,如何評估其改善的情形,則有賴於一個既可靠又準確的分析方 法來協助,才能夠有效地反應出真實的空氣品質狀況。過去針對揮發性有機物的分析,已有 相當多不同的方法被試驗或討論過,但從操作的方便性及監測物的濃度考量,吸附採樣的方 式有愈來愈受到重視的趨勢。主要原因除了是吸附劑品質的改進,使濃縮大量空氣樣品作為 低濃度物質的分析更為可行外,更由於脫附及清洗步驟的簡單化與自動化,使分析樣品的速 度及能力均大幅提昇。同時,隨著吸附劑應用範圍的擴大,也使以吸附採樣來分析揮發性有 機化合物的方法更加引起興趣。可是,無法避免的問題是當在高濕的環境中,水氣會降低了 吸附劑的吸附能力,進而造成監測分析上的不準確,甚至分析儀器的功能障礙。所以,本研 究即嘗試以常溫吸附採樣再高溫熱脫附的方式, 配合氣相層析╱質譜法( GC/MS ),來探 討大氣環境中揮發性有機物的分布情形,並希望透過檢測分析方法的建立與實際驗證,提供 更佳、更方便的監測技術。 |
英文摘要 | Major sources of volatile organic compounds (VOCs) in ambient air contain the mobile emissions (i.e. from tailpipes of automobiles and motorcycles) and the stationary discharges (i.e. from fume ducts of industry factories). Thus, the effective reduction of these sources is the key point to control the ambient air quality. However, it will be dependent upon a reliable and precise monitoring method to evaluate the improvement and actual level of air quality. Although, in the past, a lot of different methods have been discussed and employed to analyze volatile organic compounds, the adsorptive sampling scheme is seemed to be an important drift based upon the operation convenience and concentration of measured components. The main reason is that progressive quality of adsorbents makes it possible to sample much more volume of air for concentrating low level of substances. Also, the simple and automatic desorption as well as cleanup procedures can elevate the speed and capability of sample anlaysis. Moreover, the extensive application range of adsorbents makes the adsorptive sampling method more useful to measure volatile organic compounds. Unfortunately, it is inevitable that water vapor will decrease the adsorptive capability of adsorbents in humidity environment, then cause inaccuracy of the monitoring result, and even disorder the analytical instruments. Therefore, a room temperature adsorptive sampling followed by the automatic thermal desorption coupled with gas chromatography/mass spectrometry (GC/MS) is employed to study the distribution of volatile organic compounds in the ambient air. It is expected that the established and confirmed technique can practically promote the analysis of low level of volatile pollutants in the atmospheric environment. |
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