眾所周知，大氣背景溫室氣體的濃度都很低，一般在ppb (10-9 mol/mol)甚 至ppt (10-12 mol/mol)的量級。痕量的氟利昂往往需要先進行富集，然後才能檢 測。本文通過低溫吸附-熱解吸法與GC/MS法聯用，對痕量氟利昂氣體標準物質 進行定性和半定量分析。以Tenax-TA為吸附劑，液氮為冷凍劑，低溫吸附痕量氟 利昂氣體標準物質，在-30°C吸附10分鐘後，然後在180°C下熱解吸4分鐘後，再 進入色譜分析。結果表明該方法對痕量氟利昂氣體（R134a and R12，ppb)具有 良好的靈敏度和重複性。

As is known to all, the concentration of greenhouse gases (Freon, CH4 and CO2, et al.) at atmosphere is very low, generally in ppb (10-9 mol/mol) or even ppt (10-12 mol/mol) level. Trace Freon gases often need to be enriched, and then to detect. In our study, trace Freon gas reference materials were analyzed qualitatively and semi-quantitatively by Cryogenic adsorption-Thermal desorption and gas chromatography-mass spectrometry (GC/MS) combined with. With Tenax-TA as adsorbent, the TDS G thermo-regulator oven was used to adsorb Freon gas (R134a and R12, ppb) at -30°C for 10 minutes and desorb it at 180°C for 4 minutes. The gas was then introduced into gas chromatograph (GC) and detected by mass spectrometry (MS). The results showed that the method for detecting trace Freon gas (R134a and R12, ppb) has good repeatability and sensitivity.