中文摘要：

研究了初始pH值为3.0时敌草隆在柠檬酸-Fe（Ⅱ）/K2S2O8体系中的降解行为.结果显示,0.1mmol·l^-1敌草隆的最佳降解条件为：[K2S2O8]=2.0mmol·l^-1,[Fe（Ⅱ）]=1.0mmol·l^-1,[CA]=0.5mmol·l^-1.在该条件下,敌草隆的降解符合一级反应动力学,半衰期为30.5m in.此外,采用分子探针法鉴定了体系中产生的硫酸根自由基和羟基自由基.并采用液-质联用技术鉴定了敌草隆在柠檬酸-Fe（Ⅱ）/K2S2O8体系中的降解产物,探讨敌草隆在柠檬酸-Fe（Ⅱ）/K2S2O8体系中可能的降解机理.

英文摘要：

The degradation of Diuron（3-（3,4-dichlorophenyl）-1,1-dimethylurea）in aqueous solution by citric acid-iron（Ⅱ）catalyzed potassium persulfate was investigated,as well as the effects of individual initial concentration of K2S2O8,Fe（Ⅱ）and citric acid.The optimized dose of K2S2O8,Fe（Ⅱ）and citric acid were 2.0 mmol·l^-1,1.0mmol·l^-1 and 0.5mmol·l^-1 respectively for 0.1mmol·l^-1 Diuron solution（initial pH3.0）.Under this condition,the degradation of diuron followed a first-order kinetics.Hydroxyl radical and sulfate radical were determined in the citric acid-iron（Ⅱ）catalyzed potassium persulfate system of diuron with molecular probes（ethanol and tert-butanol）.The degradation products of diuron in the citric acid-iron（Ⅱ）catalyzed potassium persulfate system were identified with LC/MS methods.The possible degradation pathways of diuron were discussed.