本研究係採集大台中地區水源德基水庫原水，以 XAD-8 樹脂將水樣分離萃取出腐植酸及黃酸。再以預臭氧方式氧化腐植酸及黃酸，最後以濾膜進行molecular cutoff，減少消毒副產物的生成，並探討其臭氧氧化前後不同分子量範圍對生成消毒副產物的影響及差異。在原水分離的腐植酸及黃酸有機物中，以腐植酸為例，DOC 主要分佈於分子量0.5K-5K 的範圍，生成的三鹵甲烷生成潛能(THMFP)主要分佈的範圍是在分子量>10K 及0.5k-5k 之間，這結果與腐植酸主要結構多帶芳香族化合物及平均分子量較高有關；一般而言，消毒副產物的生成量與有機物所分佈的分子量範圍有密切的關係。

This study took sample from Te-Chi Reservoir and Applied XAD-8 resin to extract humic and fulvic acid from it. The ozone and membrance were used to used to reduce the Disinfection By-Production (DBPs)during the disinfection of both humic and fulvic acids. The membrance also be adaped as molecular cut-off tools of extracted samples. Various molecular weight pre-classified sample were used to deal the reduction of DBPs in chlorination process.For humic acid: its major dissolved organic carbon (DOC) located at molecular weight range between 0.5k to 5k dalton. While the trihalomethane formation potential (THMFP) occurred mostly at the
molecular weight range greater than 10k and between 0.5k-5k dalton. This revealed the DBPs formation in humic acids had close relation between both molecular weight distribution and chemical structure.