| 水体系中EDTA-Fe(Ⅱ)/Ｋ２Ｓ２Ｏ８降解敌草隆的研究 |
| 摘要点击 3243 全文点击 2256 投稿时间：2007-05-21 修订日期：2007-07-13 |
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| 中文关键词 敌草隆 过硫酸钾 Fe(Ⅱ) EDTA 硫酸根自由基 羟基自由基 |
| 英文关键词 diuron persulfate ferrous ion EDTA sulfate radical hydroxyl radical |
| DOI 10.13227/j.hjkx.20080515 |
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| 中文摘要 |
| 对水体系中EDTA-Fe(Ⅱ)/Ｋ２Ｓ２Ｏ８降解敌草隆的方法进行了研究.在综合考虑经济性和降解率的前提下，提出了反应的最佳条件：Ｋ２Ｓ２Ｏ８初始浓度为2.0 mmol·L－１，Fe(Ⅱ)初始浓度为1.0 mmol·L－１，EDTA初始浓度为0.5 mmol·L－１，反应时间为300 min，pH=7.0，最终0.1 mmol·L－１敌草隆降解率可达67.6%.同时，采用分子探针竞争实验鉴定了体系中产生的硫酸根自由基和羟基自由基，并采用LC/MS法鉴定了敌草隆的主要降解产物，从而探讨了敌草隆在EDTA-Fe(Ⅱ)/Ｋ２Ｓ２Ｏ８体系中可能的降解途径. |
| 英文摘要 |
| 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. |
