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Study of Competitive Chelating Reaction between Lanthanum and Tribromoarsenazo in the Medium of Weak Acid by Capillary Zone Electrophoresis

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【作者】 胡涌刚； 周培疆； 邓延倬； 程介克；

【Author】 HU Yong-gang Department of Environmental Science, Huazhong University of Science and Technology, Hubei 430074, China ZHOU Pei-jiang Department of Environmental Science, Wuhan University, Hubei 430072, China DENG Yan-zhuo Center of Analysis and Testing, Wuhan University, Hubei 430072, China CHENG Jie-kei Department of Chemistry, Wuhan University, Hubei 430072, China

【机构】 Department of Environmental Science； Huazhong University of Science and Technology； Hubei 430074； China； Wuhan University； Hubei 430072； Center of Analysis and Testing； Department of Chemistry； China；

【摘要】 <正> Two kinds of metal chelates of rare earth elements reacted with tribrimoarsenazo formed under the condition of critic acid were observed by simultaneous technique of capillary electrophoresis-photothermal interference spectrometry. The tendency of the conversion between these chelates as functions of the mole ratio of the reagent and the metal, pH value and the elapsing time was investigated. Kinetic equation of competitive chelating reaction between the TBA-La (Ⅲ) and La (Ⅲ) -critic acid were established. It was found that the competitive chelating reaction follows second-order kinetics, for this second-order reaction, k = 5. 55 L·mol-1·S-1 .

【Abstract】 Two kinds of metal chelates of rare earth elements reacted with tribrimoarsenazo formed under the condition of critic acid were observed by simultaneous technique of capillary electrophoresis-photothermal interference spectrometry. The tendency of the conversion between these chelates as functions of the mole ratio of the reagent and the metal, pH value and the elapsing time was investigated. Kinetic equation of competitive chelating reaction between the TBA-La (Ⅲ) and La (Ⅲ) -critic acid were established. It was found that the competitive chelating reaction follows second-order kinetics, for this second-order reaction, k = 5. 55 L·mol-1·S-1 .

【关键词】 capillary electrophoresis； photothermal； tribrimoar- senazo； competitive chelating reaction；
【Key words】 capillary electrophoresis； photothermal； tribrimoar- senazo； competitive chelating reaction；
【基金】 Supported by the National Natural Science Foundation of China (No. 20005005) ; Chengguang Project of Wuhan, and Visiting Scholar Foundation of Key Lab in University.
  • 【文献出处】 Journal of DongHua University ,东华大学学报(英文版) , 编辑部邮箱 ,2003年02期
  • 【分类号】O658.9
  • 【下载频次】32
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