博碩士論文 93223008 詳細資訊




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姓名 蘇源昌(Yuan-Chang Su)  查詢紙本館藏   畢業系所 化學學系
論文名稱 內部標準在氣相層析質譜儀分析揮發性有機物效能探討
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摘要(中) 中文摘要
以固態的化學吸附劑做為濃縮方法,再利用GC/FID做為分離偵測的儀器,為現今偵測碳氫化合物最廣為使用的分法之ㄧ,而利用GC/MS作為偵測儀器,更能夠解決GC/FID對於複雜VOCs定性上的困難。
但由於空氣進樣的變動性以及MS本身的訊號飄移較一般GC偵測器明顯,對於定量的結果往往造成較大的誤差,影響再現性,故在此討論自行開發重量法配置標準品方法,作為GC/MS線上分析之內標。每次進樣皆以固定濃度的方式將內標導入前濃縮系統,再以面積比例(VOC面積/內標準品面積)的方式修正儀器誤差,如此可在儀器及系統較不穩定時,將RSD值由7%~8%降低至2%-3%之間,而所製作的檢量線R2值可達到0.990~0.999之範圍。
在量測VOCs新系統的開發上,嘗試將二重層析(heart-cut)技術連接於GC/MS上,運用PLOT 管柱與DB-1 管柱的相互搭配,同時對C3~C12的VOCs物種進行定性與定量的分析,解決以往MS只能使用單一管柱分局部物質的限制,使未來的監測站能夠對於VOCs物種的測量提高定性的能力。
摘要(英) Abstract
Using chemical sorbents for enrichment and GC/FID for analysis is the most popular technique to analyze volatile organic compounds (VOCs) nowadays. Nevertheless, using GC/MS is even more versatile than GC/FID for its powerful compound identification capabilities.
Due to the larger instability associated with the MS detector than FID, poorer reproducibility is often observed when using GC/MS for VOC analysis instead of GC/FID. Using internal gas standards in GC/MS analysis can be an effective means to reduce instrumental instability. As a result, this study involves preparation of gas standards by the gravimetric method and the utilization of these gas standards for internal calibration in GC/MS analysis. The calibration method and the construction of an automated on-line enrichment system with internal standard addition are discussed. Improved analytical precision from 7~8% RSD to 2~3% was achieved. Linearity denoted by the correlation coefficient (R2) of the completed system was in the range of 0.990~0.999.
The second part of the study involves devising a heart-cut system for on-line analyzing ambient VOCs by GC/MS. Illustration and test results of integrating duel columns of a PLOT and a DB-1 to a heard-cut device coupled to a single MS detector in order to analyze C2-C12 species simultaneously are discussed, which previously was not possible and could only be performed by 2 separated detectors for the duel columns. This heart-cut GC/MS system once completed will be employed in a monitoring station for monitoring VOC species which are difficult to be identified or measured by conventional flame ionization detection.
關鍵字(中) ★ 內部標準
★ 質譜儀
關鍵字(英)
論文目次 中文摘要 I
英文摘要 II
目錄 III
表目錄 V
圖目錄 VI
第一章 前言                       1
1-1 微量揮發性有機化合物                 2
1-2 VOCs的監測                      12
1-3 參考物質與內標準品                   14
1-4 文獻回顧 21
1-5 研究目標                       24
第二章 VOC分析系統組件與內標準品原理           25
2-1 濃縮原理                       26
2-2 內標準品搭配前濃縮系統                 31
2-3 內標準品原理及操作                   41
2-4 質譜儀基礎原理 48
2-5 層析管柱                    64
2-6 自動控制程序                      67
第三章 內標準品配製與使用                 71
3-1 內標準品的配置與前置工作                72
3-2 GC/ MS與前濃縮系統分析條件最佳化        80
3-3 實驗結果與討論                    93
3-4 結論                         131
第四章 二重層析技術結合質譜分析VOCs物種 132
4-1  二重層析技術的原理                133
4-2 丁氏切換裝置與二重層析的設計           135
4-3 丁氏切換器裝置配合單FID系統          140
4-4 丁氏切換裝置配合GC/MS系統          146
第五章 總結及未來展望         165
參考文獻                         167
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指導教授 王家麟(Jia-Lin Wang) 審核日期 2006-7-18
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