高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 341.

• Chemistry in Materials Sciences • 上一篇    下一篇

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

HU Yong-Gang1, ZHOU Pei-Jiang2, DENG Yan-Zhuo3, CHENG Jie-Ke4   

  1. 1. National Lab. of Biomedical Photonics, Department of Environmental Science, Huazhong University of Science and Technology, Hubei 430074;
    2. Department of Environmental Science, Wuhan University, Hubei 430072;
    3. Center of Analysis and Testing, Wuhan University, Hubei 430072;
    4. Department of Chemistry, Wuhan University, Hubei 430072
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 基金资助:

    Supported by the National Natural Science Foundation of China, Chenguang Project of Wuhan and Visiting Scholar Foundation of Key Lab. In University.

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

HU Yong-Gang1, ZHOU Pei-Jiang2, DENG Yan-Zhuo3, CHENG Jie-Ke4   

  1. 1. National Lab. of Biomedical Photonics, Department of Environmental Science, Huazhong University of Science and Technology, Hubei 430074;
    2. Department of Environmental Science, Wuhan University, Hubei 430072;
    3. Center of Analysis and Testing, Wuhan University, Hubei 430072;
    4. Department of Chemistry, Wuhan University, Hubei 430072
  • Online:2000-12-31 Published:2000-12-31
  • Supported by:

    Supported by the National Natural Science Foundation of China, Chenguang Project of Wuhan and Visiting Scholar Foundation of Key Lab. In University.

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摘要：

Study of chelating reaction in solution is one hot and difficult field in coordination chemistry, and HPLC and CE have been used to study the kinetics of fast equilibrium in this field successfully. However, these methods are used for studying relative simple reaction systems presently[1-3]. This-paper describes a new application of CE for studying complication competitive chelating reaction in fluid-phase, which is difficult to be studied by conventional methods. Two kind metal chelate complexes of lanthanum reacted with TBA formed under the condition of critic acid were observed in real time by simultaneous technique of CE-PTI 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 was established too. As shown in tablel, It was found this competitive chelating reaction following second-order reaction, and reaction constant k=5.55 L·mol-1·S-1.

Abstract:

Study of chelating reaction in solution is one hot and difficult field in coordination chemistry, and HPLC and CE have been used to study the kinetics of fast equilibrium in this field successfully. However, these methods are used for studying relative simple reaction systems presently[1-3]. This-paper describes a new application of CE for studying complication competitive chelating reaction in fluid-phase, which is difficult to be studied by conventional methods. Two kind metal chelate complexes of lanthanum reacted with TBA formed under the condition of critic acid were observed in real time by simultaneous technique of CE-PTI 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 was established too. As shown in tablel, It was found this competitive chelating reaction following second-order reaction, and reaction constant k=5.55 L·mol-1·S-1.

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