本研究成功地開發出一套免用液態氮（LN2）的冷凝前濃縮系統，結合冷凍壓縮機（refrigeration）及多重床吸附劑，利用低溫冷凝吸附原理作為濃縮機制，此冷凝前濃縮系統可與商業化氣相層析儀結合，並自動化，無液態氮氣消耗的困擾，可提供<-40 0C 的低溫，售價便宜等多項優點，同時改善多重床吸附劑，在室溫下對 C2化合物無法完全吸附，造成分析感度不佳的原因。
此冷凝前濃縮系統搭配不鏽鋼採樣罐/自動化氣相層析質譜儀分析系統，分析非極性揮發性有機化合物C1-C8（TO-14A），共36種及極性揮發性有機化合物C2-C7，共19種，揮發性有機化合物（VOCs）共計55種，其所建立的分析方法品保品管皆符合規範，真實採樣為量測新竹科學園區污水處理廠各重要處理單元，了解VOCs逸散至空氣的概況及主要的污染物。

This research probed development of a sample pre-concentration system (cryogen-free) coupled with automated GC/MS for measurement of volatile organic compounds(VOCs) in ambient air. The sample pre-concentration system includes refrigeration and the multiple-bed adsorbent technique with low temperature condensation and adsorption phenomenon to concentrate VOCs. The system offers several merits such as being automatic, ability to use in combination with commercial instruments, works cryogen-free at condensation temperature of < -40 0C, overcomes the incomplete adsorption of the the C2 compounds onto the multiple-bed adsorbent at room temperature and is relatively low-cost.
With canister sampling and the automated GC/MS, 55 kinds of VOCs constituting 36 kinds of the non-polar VOCs (C1-C8),using TO-14A, and 19 kinds of polar VOCs (C2-C7) were analyzed. QA/QC data implied that the system meets the analytical performance grade of EPA methods. The MDL is in the range of 1.9~11.2ppb.
A successful application of this method is made to analyze the VOCs in the ambient air from the sewer systems and sewage treatment plant of hi-tech industrial park. In the sewage treatment plant, 11 kinds of VOCs were measured in air sample, among which acetone is the major pollutant, detected with a highest concentration of 512.2 ppbv.

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