本研究的前處理方法利用甲苯/甲醇(9/1 ,v/v)萃取底泥中16項多環芳香烴，在 100℃下萃取三次各10分鐘，再以矽膠管柱淨化，濃縮後完成檢液製備，續以氣相層析質譜儀分析，以分析標準參考物質1941b來驗證方法，naphthalene、fluorene、dibenz[a,h]anthracene的平均回收率分別是41.9%、55.4%、206.2%，其他10項多環芳香烴的平均回收率在72.9-113.2%。以相同溶劑組成及相同淨化步驟，比較本研究前處理方法與加壓流體萃取方法的差異，兩種方法中低分子量的多環芳香烴回收率差異小，而加壓流體萃取設備提供較高的萃取溫度，因此加壓流體萃取方法對於高分子量多環芳香烴的回收率較高，再以標準參考物質為樣品來比較本研究前處理方法與索氏萃取方法及本研究前處理方法與QuEChERS方法之差異，對於高分子多環芳香烴，本研究前處理方法比索氏萃取方法有較好的回收率，對於低分子量多環芳香烴的回收率較索氏萃取方法低，而QuEChERS方法對於多環芳香烴的回收率皆低於本研究前處理方法。此外，文中探討添加多環芳香烴標準品至底泥樣品的熟化時間對回收率的影響，結果顯示熟化一天、十天與二十天的回收率差異小，其原因可能是熟化一天後達飽和吸附量所導致。本研究前處理方法有效、便宜、可同時處理數個樣品、萃取時間小於索式萃取及溶劑耗費少的優點，具有潛力來取代傳統的前處理方法。

In this study, a simplified pretreatment method which can extract polycyclic aromatic hydrocarbons(PAHs) form contaminated sediments was developed. The PAHs were extracted 3 times with toluene/methanol (9/1, v/v) at 100℃, and sample extracts were cleaned up by silica gel. After clean-up and concentration, sample extracts were analyzed by gas chromatography coupled with mass spectrometer. The accuracy was evaluated by the standard reference material. The average recoveries of PAHs were 72.9~113.2% (except those of naphthalene, fluorene and dibenz[a,h]anthracene were 41.9%, 55.4% and 206.2%, respectively). The simplified pretreatment method were compared with pressurized fluid extraction method by recoveries of PAHs. The recoveries of low molecular weight PAHs are not obviously different. For high molecular weight PAHs, the recoveries resulted from the pressurized fluid extraction were higher. Furthermore, the different analytical method were be compared. For high molecular weight PAHs, the recoveries of simplified pretreatment method were higher and more reasonable than that of soxhlet method. The recoveries of low molecular weight PAHs resulted from simplified pretreatment method were lower. The recoveries of PAHs resulted from QuEChERS was obviously lower than that of the simplified pretreatment method. Moreover, the relationship between the recovery of PAHs and the ageing time of the spiked sample was discussed. The minor difference in recoveries resulted from different aging time. The simplified pretreatment method is fast, cheap, simplified and effective. It has potential to replace traditional pretreatment method in the future.

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