高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (4): 603.

• 论文 • 上一篇    下一篇

长寿命高选择性液膜碘离子电极的研究

曾云龙1, 唐春然1, 沈国励2, 俞汝勤2   

  1. 1. 邵阳师范高等专科学校化学系, 邵阳 422000;
    2. 湖南大学化学化工学院, 计量学与化学传感技术研究所, 长沙 410082
  • 收稿日期:1998-04-17 出版日期:1999-04-24 发布日期:1999-04-24
  • 通讯作者: 沈国励
  • 作者简介:曾云龙,男,42岁,副教授.
  • 基金资助:

    机械工业技术发展基金(批准号:96-6);湖南省自然科学基金(97-448)资助课题

Studies on Liquid Membrane Iodide Selective Electrode with Long Lifetime and High Selectivity

ZENG Yun-Long1, TANG Chun-Ran1, SHENG Guo-Li2, YU Ru-Qin2   

  1. 1. Department of Chemistry, Shaoyang Teachers College, Shaoyang, 422000;
    2. College Chemistry and Chemical Engineering, Hunan University, Institute of Chemometrics and Chemical Sensing Technology, Changsha, 410082
  • Received:1998-04-17 Online:1999-04-24 Published:1999-04-24

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被引次数

23

摘要： 合成了PVC-双硫腙-Hg(Ⅱ)载体.以该载体物质制备了高选择性碘离子电极,其选择性次序为:I-》ClO4->SCN->NO2-》Sal-～Br->NO3->Cl-.电极对碘离子的线性响应范围为1×10-3～5×10-7mol/L,检测下限为2×10-7mol/L,斜率为(59±1)mV/decade(16℃).并研究了电极的响应机理,表明系碘离子与载体中金属汞原子直接作用.将该电极应用于食盐中碘的测定,取得了满意的结果.

关键词: PVC－双硫腙－Hg(Ⅱ), 长寿命液态膜离子选择性电极, 碘

Abstract: PVC-DZT-Hg(Ⅱ) compound was synthesized and used to prepare a high selectivity iodide electrode. The selectivity order of the electrode is I-》ClO4->SCN->NO2》-Sal-Br->NO3->Cl-. The electrode has a linear response to iodide from 1×10-3to 5×10-7mol/Lwith a detection limit of 2×10-7mol/Land a slope of (59±1) mV/decade(16℃ ). The response mechanism of the electrode was investigated by spectroscopic techniques. It was demonstrated that iodide anion acts with Hg in the carrier. The electrode was satisfyingly used for the determination of iodine content in the salts from different markets.

Key words: PVC-DTZ(diphenylthiocarbazone)-Hg(Ⅱ), Long-lifetime liquid membrane ion selective electrode, Iodine

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