三氯氟甲烷(Trichlorofluoromethane, CFC-11)是純人工化合物，CFC-11在大氣中的濃度隨著時間具有獨特的特徵。CFC-11經由降雨入滲地下水，隨著地下水中CFC-11的濃度變化對應出地下水補注年代。本研究創新現地下水採樣方法及分析CFC-11濃度達到萬億分之一(ppt)。地下水水樣經由吹氣捕捉裝置(purge-and-trap)萃取後進入電子捕集偵測器(ECD)分析CFC-11濃度。本研究成功利用CFC-11地下水定年方法應用於台灣中部山區裂隙含水層。研究發現地勢平緩的主要河道旁，地下水補注年代較為古老；位於地勢陡峭的支流河道旁，地下水補注年代較為年輕。

Trichlorofluoromethane (CFC-11) is an entirely man-made compound. Because of its unique atmospheric history, the presence of CFC-11 in groundwater is significant in terms of the groundwater age, the time since the precipitation entered the ground as recharge. Innovative methodology for field sampling and analyzing groundwater containing parts per trillion concentrations of CFC-11 is presented. Samples are analyzed by purge-and-trap with an electron capture detector (ECD). The method was applied to central Taiwan to demonstrate the usefulness of CFC-11 as an age-dating tool of fractured aquifers. Results of dating indicate that the oldest groundwater samples are located at wells near the gentle-slope main streams. Comparatively young groundwater samples are present at wells on steep-slope small tributaries of major rivers.

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