UV absorbance at 254 nm (UV254) and electron-donating capacity (EDC) abatements were developed as novel surrogate parameters to evaluate the degradation of micropollutants in different water samples after direct permanganate (Mn­(VII)) oxidation or Mn­(VII) oxidation with filtration. UV254 abatement was mainly attributed to the enhanced coagulation effect of manganese oxidation products. EDC was abated more efficiently than UV254 because the reaction products of Mn­(VII) oxidation by accepting electrons still absorb at 254 nm. UV254 and EDC abatements during direct Mn­(VII) oxidation were compared to those resulting from other preoxidation processes including ozonation, peroxomonosulfate (PMS) oxidation, and PMS-Fe­(II) oxidation. UV254 was significantly abated during ozonation with tert-butanol while EDC abatement was notable after direct Mn­(VII) oxidation. The humic-like fluorescent value first increased slightly and decreased significantly with increasing Mn­(VII) dose. The assimilable organic carbon formation increased during Mn­(VII) oxidation with filtration. The relative abatement of selected micropollutants showed good one-phase correlations with UV254 or EDC in humic acid solution and lake water and two-phase correlations in groundwater. During Mn­(VII) oxidation and filtration of lake water followed by postchloramination, N-nitrosodimethylamine (NDMA) and total N-nitrosamine formation decreased with increasing specific Mn­(VII) dose. NDMA formation abatement correlated well with EDC abatement.

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