高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (2): 210.

• 研究简报 • 上一篇    下一篇

基于非化学计量化合物TiO2-σ的铜离子敏感电极研究

肖丹, 李军, 林辉概, 袁红雁, 王柯敏, 俞汝勤   

  1. 湖南大学化学化工学院, 长沙, 410082
  • 收稿日期:1997-01-06 出版日期:1998-02-24 发布日期:1998-02-24
  • 通讯作者: 俞汝勤
  • 作者简介:肖丹,男,36岁,副教授.
  • 基金资助:

    国家自然科学基金和机械工业技术发展基金资助课题.

Copper(Ⅱ)Sensitive Electrode Based on Nonstoichiometric Compound TiO2-σ

XIAO Dan, LI Jun, LIN Hui-Gai, YUAN Hong-Yan, WANG Ke-Min, YU Ru-Qin   

  1. College of Chem. & Chem. Engin., Hunan University, Changsha, 410082
  • Received:1997-01-06 Online:1998-02-24 Published:1998-02-24

关键词: 铜离子, 电位法, 非化学计量化合物, TiO2-&sigma,

Abstract: Anew potentiometric sensor for copper(Ⅱ) based on a titanium matrix is proposed. The sensor shows a Nernst response toward copper(Ⅱ) which seems to originate from the nonstoichiometric compound TiO2-σ layer covering on the electrode surface according to the results of XPS spectra of the electrode surface and a.c. impedance of the electrochemical system. The sensor owned a linear range from 10-5~10-2 mol/L with a detection limit of 5×10-6 mol/L in 0.1 mol/L citric acid-sodium dihydrogen citrate buffer solution of pH 2.2 The standard deviations determined by alternatively immersing the electrode in 1.0×10-4 and 1.0×10-3 mol/L levels six times are 1.7 mVand 1.4 mV, respectively. The e.m.f. drift in 10-3 mol/L copper(Ⅱ) solution is less than 2mV within two hours. The sensor has an excellent selectivity for copper(Ⅱ) with respect to many common divalent cations.

Key words: Copper(Ⅱ), Potentiometry, Nonstoichiometric compound, TiO2-σ

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