... - 28 -Table 2 - Summary of the test results. In this study, mutagenicity and MFP were assessed by means of the net number of revertant colonies per unit of mass of the added ACs [net rev./mg-AC]. ... precursors of strong mutagens. Journal of Water and Environment Technology, Vol. 6, No.1, 2008 - 31 - Fig. 8 - Changes of MFP by biodegradation: ○ mutagenicity of composite ... Journal of Water and Environment Technology, Vol. 6, No.1, 2008 - 22 -Preparation of Composite Samples To prepare 10 mg-AC/L of aqueous solution, 100 mg of AC was dissolved into 2 mL of ethanol...