Oxidation of As(III) by potassium permanganate
Oxidation of As（Ⅲ） by potassium permanganate

The oxidation of As(III) with potassium permanganate was studied under conditions including pH, initial As(III) concentration and dosage of Mn(VII). The results have shown that potassium permanganate was an e ective agent for oxidation of As(III) in a wide pH range. The pH value of tested water was not a significant factor a ecting the oxidation of As(III) by Mn(VII). Although theoretical redox analyses suggest that Mn(VII) should have better performance in oxidization of As(III) within lower pH ranges, the experimental results show that the oxidation e ciencies of As(III) under basic and acidic conditions were similar, which may be due to the adsorption of As(III) on the Mn(OH)2 and MnO2 resulting from the oxidation of As(III).