本研究主要以P&T/GC/MS與SPME/GC/FID雙系統併行的方式，來進行高科技產業相關水體中VOCs的採樣分析，由於P&T技術對於非極性VOCs的分析效果卓著，然而其無法對極性VOCs具有很好的前處理效果，因此針對極性VOCs的部分便利用SPME方法來進行前處理，以期能夠獲得更準確的極性VOCs測值。
於P&T部分本研究主要參考美國環保署Method 624與國內環保署之NIEA.W785.50B標準方法來建立系統，目前本研究所完成的P&T/GC/MS系統可對50種以上的VOCs做準確定性定量，在SPME的部分完成了最佳化測試與校正實驗，經由最佳化測試的過程中發現對四個目標極性物種acetone、IPA、PGMEA與EL的偵測能力可達到ppb級，於十點校正測試中發現R2均於0.985以上，且在QA/QC測試中發現各物種之RSD均小於10%，相較於P&T對四待測物種之最佳R2小於0.94，可知對極性VOCs而言SPME優於P&T，不過本研究的SPME平衡時間較長，處理一個樣品須一小時以上。

在真實樣品測試方面，測定目標為科學園區內某污水處理廠與其排放管道水質，結果顯示濃度在ppm級的acetone為最主要的極性污染物，至於在非極性部分則以100 ppb級的toluene為主，此外於生物處理過後會產生超過100 ppb的DMS，其為臭味的主因。由於這些物種於排放管道中均有測得，亦即這些物種均會造成承受水體的污染，顯示該廠在VOCs控制方面依然有待加強。

The major objective in this study is to apply different techniques to analyze the polar and nonpolar volatile organic compounds (VOCs) in the waste streams of Hi-tech industries. The purge and trap (P&T) technique is known for its excellent extraction efficiency in the analysis of nopolar compounds. However for polar compounds, P&T shows poor linearity and precision. Due to the advantages of solventless and low setup cost, solid phase microextraction (SPME) had been chosen for the analysis of polar compounds.
In the P&T experiments, all the steps and criteria were followed by US EPA Method 624 and Method NIEA.W785.50B of R.O.C. EPA. Over 50 kinds of VOC can be analyzed by the P&T/GC/MS system in this study. For SPME experiments, both optimization and calibration were tested. According to the results of SPME, it shows good linearity (R2>0.985) and precision (RSD<10%) for four target compounds in this study. Hence SPME is much better than P&T in the linearity results of P&T (best R2<0.94) for polar VOCs analysis, although the equilibrium time of SPME is over 1 hour.

All the real samples were collected from a wastewater treatment plant of the Hi-tech industries and the surroundings of its effluent. The major polar and nonpolar pollutant is acetone (over 1 ppm) and toluene (over 100 ppb) respectively. Odorous dimethyl sulfide (DMS) was formed in the wastewater after biological unit. Besides, DMS and acetone were still existing in the samples collected from the surroundings of its effluent. These compounds are likely the reason of odor problem in the surroundings. Hence the VOCs control of the treatment plant has to be enforced in the future.

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