含氯有機溶劑常出現於台灣地下水污染中，其會對人體健康造成傷害，含氯有機溶劑中的四氯乙烯會因生物降解依序轉變為三氯乙烯、二氯乙烯、乙烯。監測式自然衰減法(monitored natural attenuation)為整治概念，使用前須先通過自然衰減可行性評估，其中需使用污染傳輸模式進行自然衰減的模擬，以確定污染物濃度是否於時間內達到整治目標。BIOCHLOR為美國環保署用來模擬含氯有機溶劑自然衰減整治之模式。但此模式存在著兩個問題：(1)其解為Domenico的近似解析解，而文獻中指出Peclet number小會造成誤差；(2)模式假設各物種有相同的遲滯因子，與每個物種個有不同的遲滯因子情況不符。本研究針對BIOCHLOR 2.2進行功能性評估，藉由HYDROGEOCHEM 4.5s進行比較。結果顯示，BIOCHLOR 2.2適用於Peclet number大、濃度達到穩態時，而且為四氯乙烯、三氯乙烯和二氯乙烯結果較為可信，BIOCHLOR 2.2不適合做氯乙烯之致癌風險評估，因為會有低估風險的疑慮。

There are many contaminated groundwater chlorinated solvent sites in Taiwan. The chlorinated solvent will cause harm to human health. Biotransformation of the chlorinated ethenes occurs via sequential dechlorination of perchloroethylene to trichloroethylene, trichloroethylene to dichloroethane, dichloroethane to vinyl chloride, and finally vinyl chloride to ethene. The chlorinated solvent sites have many remedial technology could choose. Monitored natural attenuation is concept for the remediation; used monitored natural attenuation need initial screening. BIOCHLOR is screening tool that is provided by the Center for Subsurface modeling Support of US Environmental Protection Agency. The BIOCHLOR 2.2 has two problems: (1) BIOCHLOR uses the Domenico solution that has literature indicate when dispersivity is large have increase error. (2) BIOCHLOR uses one retardation factor, not individual retardation factors for each constituent. In this study is to functional evaluation of BIOCHLOR 2.2 and comparison with HYDROGEOCHEM 4.5s. The results show BIOCHLOR 2.2 applied to small dispersivity, concentration become steady state and only more credible of perchloroethene, trichloroethene, dichloroethene. BIOCHLOR 2.2 is unsuitable for cancer risk assessment of vinyl chloride, because there are underestimate risk.

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