DC 欄位 值 語言 DC.contributor 化學學系 zh_TW DC.creator 吳蘭妲莉 zh_TW DC.creator Eka Ratri Noor Wulandari en_US dc.date.accessioned 2012-7-16T07:39:07Z dc.date.available 2012-7-16T07:39:07Z dc.date.issued 2012 dc.identifier.uri http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=992203601 dc.contributor.department 化學學系 zh_TW DC.description 國立中央大學 zh_TW DC.description National Central University en_US dc.description.abstract 由於溫室效應氣體之濃度在大氣中逐年上升，其中二氧化碳、甲烷、氧化亞氮因具有較高濃度、長生命期與在紅外光區有高吸收之緣故；因此，本實驗之目的為建立自動化搭配逆吹系統以期能快速地分析上述三者溫室效應物種，實驗中所使用之管柱為Hayesep Q與Porapak Q。火焰離子偵測器負責二氧化碳與甲烷之量測，電子捕捉偵測器則負責氧化亞氮之量測；二氧化碳則在375 ̊C之條件下，經由使用鎳觸媒之甲烷轉化氣轉化為甲烷才可被火焰離子偵測器所量測。樣品迴圈約為2毫升，進樣壓力則設定為700 torr。二氧化碳、甲烷與氧化亞氮之線性關係分別為1.000、0.9907與0.9990；偵測下限則分別為1.02 ppmv、1.07 ppmv與6.40 ppbv。三種氣體在系統的量測下, 相對標準偏差 (Relative Standard Deviation) 皆在1%以內, 表現出實驗的精確性。 zh_TW dc.description.abstract The so called enhanced global warming is caused by the increase in the concentration of greenhouse gases (GHGs) in the atmosphere due to anthropogenic activities. Of all the GHGs, CO2, CH4, and N2O are the major contributors due to their large abundance, long lifetimes, and relatively strong IR absorption abilities. In this experiment, the three GHGs in the atmosphere will be measured using gas chromatography (GC) with the packed column back-flushed method. The stationary phases used for the packed columns are Hayesep Q and Porapak Q. For CO2 and CH4 analysis flame ionization detection (FID) is used, and for N2O analysis electron capture detection (ECD) is used. CO2 was first reduced into CH4 by an in-line Ni catalyst kept at 375 ̊C before detection with FID. To perform sample injection, the pressure for the sample loop (2 mL) was set at 700 torr with a pressure gauge which allowed automatic sample filling. The linearity for CH4, CO2, and N2O, as depicted by the correlation coefficients (R2), are 0.9907, 1.000, and 0.9990, respectively. Limits detection for these three gases are 1.07 ppmv, 1.02 ppmv, 6.40 ppbv, respectively. Precision, as depicted by the standard deviation (RSD), is better than 1% for the three gases. en_US DC.subject 溫室氣體 zh_TW DC.subject 填充管柱 zh_TW DC.subject 逆吹式 zh_TW DC.subject 氣相層析 zh_TW DC.subject back-flush en_US DC.subject gas chromatography en_US DC.subject packed column en_US DC.subject Greenhouse gases en_US DC.title 自動化溫室效應氣體分析系統之建立與應用 zh_TW dc.language.iso zh-TW zh-TW DC.title CONSTRUCTION OF A GC SYSTEM FOR MEASURING ATMOSPHERIC GREENHOUSE GASES – N2O, CH4, AND CO2 en_US DC.type 博碩士論文 zh_TW DC.type thesis en_US DC.publisher National Central University en_US