高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (3): 233.

• 研究论文 • 上一篇    下一篇

钒-5-Br-PADAP-溴酸钠体系极谱催化波的研究

张成孝, 高鹏   

  1. 陕西师范大学化学系
  • 收稿日期:1987-07-21 出版日期:1989-03-24 发布日期:1989-03-24
  • 通讯作者: 张成孝

Study on Polarographic Catalytic Wave in Vanadium-2-[(5-Bromo-2-Pyridyl)-Azo]5-Diethylaminophenol-Sodium Bromate System

Zhang Chengxiao, Gao Peng   

  1. Department of Chemistry, Shaanxi Normal University, Xi'an
  • Received:1987-07-21 Online:1989-03-24 Published:1989-03-24

摘要: 报道了钒在5-Br-PADAP-溴酸钠介质中极谱催化波的形成条件和反应机理。该法测定钒的线性范围为(0.04~20)×10-3ppm,检测限可达0.02×10-3ppm,较成功地应用于水样和矿样分析。

关键词: 钒, 5-Br-PADAP, 溴酸钠, 极谱催化波

Abstract: In a supporting electrolyte containing 4.0×10-6mol/L5-Br-PADAP, 0.025mol/L NaBrO3, 0.002mol/L H2SO4,0.008mol/L Na2SO4(pH=2.40±0.05), a sensitive polarographic catalytic wave of vanadium was obtained by using single-sweep polarography. The peak potential of this wave appears at -0.17V. The change of peak height of derivative wave with concentration of vanadium is linear in the range from 0.04×10-3ppm to 20 ×10-3ppm.The method has been successfully applied to the determination of vanadium in tap water and ores. The composition and the condition stability constant of the vanadium(V) complex with 5-Br-PADAPhave been determined. The electrode processes of the catalytic wave may be presented as folios. (这里有图片198903-263-1.gif)

Key words: Vanadium, 2-[5-Bromo-2-pyridyl-azo]-5-diethylaminophenol, Sodium bromate, Polarographic catalytic wave

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