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化学学报
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化学学报 ›› 1992, Vol. 50 ›› Issue (11): 1117-1122. 上一篇    下一篇

研究论文

铑(Ⅲ)与5-(5-氯-2-吡啶偶氮)-2,4-二氨基甲苯的配合物催化氢波研究

张振义;张光;冯媛媛   

  1. 陕西师范大学化学系
  • 发布日期:1992-11-15

Studies on the catalytic hydrogen wave of rhodium complex with 5-(5-chloro-2-pyridylazo)-2,4-diaminotoluene

ZHANG ZHENYI;ZHANG GUANG;FENG YUANYUAN   

  • Published:1992-11-15

PDF

349

被引次数

7

本文建立了一种催化极谱法测定痕量铑的新方法.先使铑(Ⅲ与5-Cl-PADAT在pH5的HOAc-NaOAc3缓冲溶液中生成稳定的配保物,再于适量HClO~4底液中进行极谱测定.并研究了影响极谱催化波的各种因素及波的性质,确定该波为铑(Ⅲ)与5-Cl-PADAT配合物的催化氢波,提出了可能的电极过程,并进行了实验验证.该法测定铑的线性范围为3.9×10^-12-3.9×10^9mol·dm^-3,检出限为1.9×10^-12mol·dm^-3.已应用于镍基金合金及催化剂中铑的测定.

关键词: 反应机理, 极谱分析, 铑, 吡啶偶氮二氨基苯, 电极反应, 催化氢波

A highly sensitive method for determing rhodium by catalytic polarog. was established. Rhodium first reacts with 5-(5-chloro-2-pyridylazo)-2,4-diaminotoluene (5-Cl-PADAT) to form a stable complex in a HOAc-NaOAc buffer solution at pH 5. A polarogram was recorded in media of HClO4. The optimum anal. conditions were determine through investigating various influences on on the catalytic wave. Characteristics of the wave were also researched and it is proved that the wave is a catalytic hydrogen wave of the complex of rhodium with 5-Cl-PADAT. An electrode mechanism was proposed and was verified experimental The linearity range of rhodium concentration is 3.9 ?10-12 to 3.9 ?10-9 mol dm-3; the detection limit is 1.9 ?10-12 mol dm-3. The method has been applied to the determination of rhodium in nickel base alloy without any chem. separation; satisfactory results were obtained.

Key words: REACTION MECHANISM, POLAROGRAPHIC ANALYSIS, RHODIUM, PADAB, ELECTRODE REACTION

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