高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (S1): 111.

• Electroanalytical Chemistry • 上一篇    下一篇

Linear Sweep Voltammetic Determination of Trace Lead Ion at Acid Chrome Blue K Modified Solid Paraffin Wax Carbon Paste Electrode

ZHANG Hai-Li, YE Yong-Kang, WAN Qi-Jin, XU Bin   

  1. Department of Chemistry, Hubei Normal University, Huangshi 435002, P. R. China
  • 出版日期:1999-12-31 发布日期:1999-12-31

Linear Sweep Voltammetic Determination of Trace Lead Ion at Acid Chrome Blue K Modified Solid Paraffin Wax Carbon Paste Electrode

ZHANG Hai-Li, YE Yong-Kang, WAN Qi-Jin, XU Bin   

  1. Department of Chemistry, Hubei Normal University, Huangshi 435002, P. R. China
  • Online:1999-12-31 Published:1999-12-31

PDF (PC)

摘要：

Acid chrome blue K (ACBK) is a kind of indicator in coordinate titration. On mercury electrode simultaneous determination of trace cobalt and nickel in ACBK solution by 2.5th differential stripping voltammetry has been reported.But in positive potential ranges mercury electrodes would not be used because of oxidation of the electrode material. Carbon paste electrode (CPE) had been invented in an attempt to prepare a dropping, renewable electrode that could be used in positive potential ranges where mercury electrodes are not applicable. This type of electrode could be modified with other materials easily, and then we can obtain various chemically modified CPE. We can modify CPE chemically by using ACBK. Metal ions will be accumulated to form ACBK-Mn+ complex by open circuit on the electrode surface, then through electrochemical method the complex will be detected. ACBK is a soluble material, if use a liquid binder such as mineral oil, it will be washed off easily, but we use solid paraffin wax as binder,then the CPE was very stable in solution.

Abstract:

Acid chrome blue K (ACBK) is a kind of indicator in coordinate titration. On mercury electrode simultaneous determination of trace cobalt and nickel in ACBK solution by 2.5th differential stripping voltammetry has been reported.But in positive potential ranges mercury electrodes would not be used because of oxidation of the electrode material. Carbon paste electrode (CPE) had been invented in an attempt to prepare a dropping, renewable electrode that could be used in positive potential ranges where mercury electrodes are not applicable. This type of electrode could be modified with other materials easily, and then we can obtain various chemically modified CPE. We can modify CPE chemically by using ACBK. Metal ions will be accumulated to form ACBK-Mn+ complex by open circuit on the electrode surface, then through electrochemical method the complex will be detected. ACBK is a soluble material, if use a liquid binder such as mineral oil, it will be washed off easily, but we use solid paraffin wax as binder,then the CPE was very stable in solution.

TrendMD: