高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (6): 819.

• 论文 • 上一篇    下一篇

校正计算－催化动力学方法同时测定钨(Ⅵ)和钼(Ⅵ)

倪永年, 谢素雯   

  1. 南昌大学化学系, 南昌, 330047
  • 收稿日期:1993-08-02 修回日期:1993-12-06 出版日期:1994-06-24 发布日期:1994-06-24
  • 通讯作者: 倪永年,男,48岁,副教授.
  • 作者简介:倪永年,男,48岁,副教授.
  • 基金资助:

    国家自然科学基金;江西省自然科学基金

Kinetic-Catalytic Simultaneous Determination of Tungsten(Ⅵ)and Molybdenum(Ⅵ)in Mixtures with Multivariate Calibration Method

NI Yong-Nian, XIE Su-Wen   

  1. Department of Chemistry, Nanchang University, Nanchang, 330047
  • Received:1993-08-02 Revised:1993-12-06 Online:1994-06-24 Published:1994-06-24

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摘要： 利用某些试剂(柠檬酸、酒石酸、草酸及丙二酸)对钨(Ⅵ)、钼(Ⅵ)催化作用抑制程度的差异,对钨(Ⅵ)、钼(Ⅵ)进行了同时测定。先对一组标准钨(Ⅵ)、钼(Ⅵ)混合溶液进行校正计算并建立了线性和非线性的两种模型,再对含量在0.012～0.20μg/mL范围内的未知钨(Ⅵ)、钼(Ⅵ)含量的混合溶液进行了浓度预报。以碘离子选择电极量测催化反应过程中体系的电位变化,并以此值表示催化反应的速率。

关键词: 催化动力学分析法, 钨和钼, 多元校正, 同时测定, 碘离子选择电极

Abstract: Tungsten(Ⅵ)and molybdenum(Ⅵ)have similar catalytic behavior and they all have catalytic effects on the oxidation of iodide by hydrogen peroxide in acidic medium.There is, however, different inhibition in the catalytic activity of each catalyst in the presence of suitable organic reagents.In this paper, two equal sets of standard mixtures of tungsten(Ⅵ)and molybdenum(Ⅵ)were used as the catalysts in the experiments with and without the presence of Organic reagents, respectively.The reaction rate was measured potential by an iodic ion selective t3lectrode.Two multivariate calibration models, linear and nonlinear, were then developed.The catalytic behavior of tungsten(Ⅵ)and molybdenum(Ⅵ)in the presence of different organic acids(citric, tartaric, oxalic and malonic)was investigated.The two calibration models were successfully applied to the prediction of unknown samplesof trace tungsten(Ⅵ)and molybdenum(Ⅵ)in the range of 0.012-0.20μg/mL.

Key words: Kinetic-catalytic method, Tungsten and molybdenum, Multivariate calibration, Simultaneous determination, Iodic ion seiective electrode

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