Degradation of Diuron by Persulfate Oxidation Activated by EDTA-Ferrous Ion in Aqueous System
水体系中EDTA-Fe(Ⅱ)/Ｋ２Ｓ２Ｏ８降解敌草隆的研究

The method of diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) degradation by persulfate oxidation activated by EDTA-ferrous ion in aqueous system was conducted. Based on both of the degradation performance and the operating costs, optimal reaction condition was proposed. Operating at K2S2O8 initial concentration 2.0 mmol?L-1, Fe(II) initial concentration 1.0 mmol?L-1, EDTA initial concentration 0.5 mmol?L-1, reaction time 300 min and pH=7.0, about 67.6 % of 0.1 mmol?L-1 diuron was degradation. Hydroxyl radicals and sulfate radicals produced in the system were determined by molecular probes (ethanol and tert-butanol) methods. The degradation products of diuron were identified with LC/MS methods and the degradation pathways of diuron were discussed.