高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (1): 47.

• 研究简报 • 上一篇    下一篇

有机锡化合物为中性载体的高选择性硫氰酸根离子电极

李志强1, 宋小平2, 袁若1, 应敏1, 沈国励1, 俞汝勤1   

  1. 1. 湖南大学化学化工学院, 长沙 410082;
    2. 湖南省粮食学校, 长沙 410006
  • 收稿日期:1998-03-26 出版日期:1999-01-24 发布日期:1999-01-24
  • 通讯作者: 沈国励.第一作者:李志强,男,32岁,博士.
  • 基金资助:

    高等学校博士点基金;机械工业技术发展基金;湖南省自然科学基金

Thiocyanate selective PVC Membrane Electrodes Based on Organotin(Ⅳ)Compounds as Neutral Carriers

LI Zhi-Qiang1, SONG Xiao-Ping2, YUAN Ruo1, YING Min1, SHEN Guo-Li1, YU Ru-Qin1   

  1. 1. Institute of Chemomet rics and Chemical Sensing Technology, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082;
    2. Hunan Grain School, Changsha, 410006
  • Received:1998-03-26 Online:1999-01-24 Published:1999-01-24

摘要: 使用硫氰化银与硫化银作膜活性物质的固态硫氰酸根离子选择电极,由于受卤素离子如Cl-、Br-和I-干扰很大而限制了应用.以钴(Ⅲ)卟啉或维生素B12衍生物为载体的电极对SCN-有较高的选择性[1,2],使SCN-选择电极得到了较大的发展.

关键词: 离子选择电极, 硫氰酸根, 三苄基锡酚盐, 中性载体

Abstract: The paper describes solvent polymeric membrane anion selective electrodes based on t ribenzyltin pHenolates as neutral carriers.The Electrode based on tribenzyltin p-nitrophenolatepossesses excellent potentiomet ric response characteristics and selectivity towards thiocyanate, The linear range is(0.1246)×10-5mol/Lwith a slope of -56.8.The Electrode demonst rates anti-Hof meister behavior, and The selectivity sequence observed is:t hiocyanate>benzoate>perchlo-rate>iodide>nitrite>nitrate>acetate>bromide>chloride.The potentiometric response charac-teristics and selectivity have a close relationship with The structure of The carriers, as The substitute in pHenol ring changes from nitro-to hydrogen, then to t-butyl, the potentiometric response characteristics and selectivity to t hiocyanate deteriorate to some extent.The Electrode based on tribenzyltin p-nitrophenolate has a fast response time, fair stability and reproducibility and could be used for The detection of thiocyanate in act ual samples with satisfactory results.

Key words: Ion-selective electrodes, Thiocyanate, Tribenzyltin phenolate, Neutral carriers

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