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化学学报
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化学学报 ›› 1996, Vol. 54 ›› Issue (5): 516-520. 上一篇    

研究论文

二(乙基黄原酸基)金属配合物为中性载体高选择性碘离子电极的研究

袁若;林守群;沈国励;田德余;俞汝勤   

  1. 湖南大学化学计量学及化学传感技术研究所;国防科学技术大学材料科学与应用化学系
  • 发布日期:1996-05-15

Di(ethylxanthate) complexes of metal(Ⅱ) as neutral carriers for highly selective iodide electrodes

YUAN RUO;LIN SHOUQUN;SHEN GUOLI;TIAN DEYU;YU RUQIN   

  • Published:1996-05-15

PDF

446

被引次数

12

本文研究了二(乙基黄原酸基)金属配合物为中性载体的阴离子选择性电极,其中二(乙基黄原酸基)钴(Ⅱ)对碘离子有高的选择性, 且电极呈现反Hofmeister行为, 其选择次序是: I^->SCN^->NO2^->Br^->ClO4^->SO4^2^->NO3^->Cl^-, 采用交流阻抗和光谱分析技术研究了电极的响应机理, 并将电极用于药品分析,结果令人满意。

关键词: 离子选择电极, 黄原酸类, 钴络合物, 响应机理, 国家教委高等学校博士学科点专项科研基金, 湖南省自然科学基金, 碘离子电极

The present paper describes solvent polymeric membrane anion selective electrodes based on di(ethylxanthate) complexes of metal(Ⅱ) [cobalt(Ⅱ), mercury(Ⅱ) and zinc(Ⅱ)] as neutral carriers. The electrode incorporating cobalt(Ⅱ)-di(ethylxanthate) has high selectivity toward the iodide ion and demonstrates anti-Hofmeister behaviour. The electrode showed a near-Nernstian potentiometric response for 10^-^1~10^-^6mol/L I^- with a detection limit of 7.9×10^-^7mol/L and a slope of 54mV/pI^- (20℃). The electrode has low resistance, fast response time, fair stability and reproducibility. The selectivity sequence observed is iodide> thiocyanate>nitrite>bromide>perchlorate>sulfate>nitrate>chloride. The response mechanism of the electrode was also studied with the a.c. impedance and spectroscopic techniques.

Key words: ION SELECTIVE ELECTRODE, XANTHOGENIC ACIDS, COBALT COMPLEX

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