博碩士論文 972203054 完整後設資料紀錄

DC 欄位 語言
DC.contributor化學學系zh_TW
DC.creator鄧明凱zh_TW
DC.creatorMing-Kai Tengen_US
dc.date.accessioned2010-7-30T07:39:07Z
dc.date.available2010-7-30T07:39:07Z
dc.date.issued2010
dc.identifier.urihttp://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=972203054
dc.contributor.department化學學系zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstract中文摘要 全面二維層析(Comprehensive two dimensional chromatography)技術的提出,對於過去分離複雜樣品所產生共析(co-elution)的問題有了新的解決方法,巧妙利用了兩根極性或性質不同的管柱,以正交(orthogonality)形式將分析物在二維平面上展開,比起以往只有一維滯留時間分佈擁有了更佳的解析度與更多的峰容量,大幅改善了對複雜樣品的分析品質。 而目前商業化全面二維層析系統,以冷凍式調制器為主,造價昂貴並且受制於冷劑的補充等問題,因此許多研究致力於閥件式調制器的開發,以簡單、堅固、便宜、無需冷劑等優點而受到重視。而本實驗以自製丁式切換器(Deans’ switch)作為閥件式調制器,並利用自製之前濃縮系統建構出一低成本之全面二維層析方法,應用於大氣中氟氯碳化物(chlorofluorocarbons, CFCs)的量測。以丁式切換器提供快速且連續的樣品脈衝,以60米的DB-1作為第一維管柱,與極短的0.2米PLOT作為第二維管柱,展現揮發度與滯留力之特有正交性結果;最後數據以Surfer 8軟體呈現,在自行撰寫程式碼之運行下,可快速得到2D圖譜、地形圖與積分結果。 在此全面二維層析系統進行檢量線與再現性測詴,針對2D圖譜檢驗層析峰體積對應進樣量的線性關係,線性表現R2值可達0.99以上,RSD值優於4.74%以內(N=4)。並使用傳統一維與全面二維層析法作比較量測空氣中之CFCs,結果顯示CFC-12與CFC-113在大氣中濃度相當恆定,RSD值分別為2.63%(一維CFC-12)、3.34%(一維CFC-113)與3.85%(二維CFC-12)、3.49%(二維CFC-113),兩方法所得結果相符,更可應證此全面二維層析方法的可靠性。 zh_TW
dc.description.abstractAbstract Comprehensive two-dimensional chromatography (GCxGC) opened a new era in improving separation resolution for very complex samples. It uses two columns of different polarity to provide orthogonal separation on a 2-D surface, which considerably increases the peak capacity and hence resolution compared to conventional 1-D chromatography. A typical commercial GCxGC system often uses a cryogenic modulator whose cost is high, and the consumption of cryogen creates additional financial burden. In contrast, many studies focused on developing valve-based types of modulators, which are simple in design and construction. Moreover, cryogen is not required. In our study we used a Deans’ switch to construct the modulator for GCxGC. When combined with a self-constructed thermal desorption unit, this system was able to analyze atmospheric chlorofluorocarbons (CFCs) at pptv level. The volatile sample peaks eluted from the first column (DB-1 60 m) were sliced into sample pulses by the Deans’ switch and sent to the second column (PLOT 0.2 m) for the second dimensional separation. For optimal GCxGC separation of CFCs the modulation pulse and period were set at 0.2 s and 3 s, respectively.By varying the sample size of a pressurized air sample, the linearity of the method was better than 0.990. The precision at atmospheric concentrations was better than 4.74% (RSD). The Deans’ switch-GCxGC method was further tested by continuous measuring outdoor ambient air, and compared the atmospheric variability of CCl2F2 (CFC-12) and CClF2CCl2F (CFC-113) with that from the corresponding 1D GC results. The variability of CFC-12 and CFC-113 denoted by RSD was 3.85% and 3.49%, respectively, for GCxGC versus 2.63% and 3.34%, respectively, for 1D GC. The comparable results suggest that our Deans’ switch-GCxGC method is sufficiently robust to analyze atmospheric CFCs. en_US
DC.subject全面二維層析zh_TW
DC.subjectComprehensive two-dimensional gas chromatographyen_US
DC.title全面二維層析技術分析空氣中之氟氯碳化物zh_TW
dc.language.isozh-TWzh-TW
DC.titleComprehensive two-dimensional gas chromatography (GCxGC) for atmospheric chlorofluorocarbonsen_US
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

若有論文相關問題,請聯絡國立中央大學圖書館推廣服務組 TEL:(03)422-7151轉57407,或E-mail聯絡  - 隱私權政策聲明