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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Mechanistic aspects of nitrate-selective electrodes with immobilsed ion exchangers in a rubbery membrane
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Mechanistic aspects of nitrate-selective electrodes with immobilsed ion exchangers in a rubbery membrane

机译：固定在橡胶膜中的离子交换剂的硝酸盐选择电极的机理

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摘要

The response mechanism of nitrate ion selective electrodes (ISEs) containing covalently bound quaternary ammonium salt sensor molecules has been investigated using N-15 tracer studies, ion exchange measurements and surface analysis by electron microscopy using energy dispersive X-ray analysis. The ISEs were shown to operate by surface ion exchange mechanism with no involvement of ion diffusion though the membrane. Ion selectivity was shown to be dependent on a solvent mediator increasing membrane surface permeability towards nitrate allowing ion exchange to occur. A new sub-category of classification for electrodes of this type is proposed. [References: 21]
机译：使用N-15示踪剂研究，离子交换测量和通过电子显微镜通过能量色散X射线分析进行的表面分析，研究了含有共价键合的季铵盐传感器分子的硝酸根离子选择性电极（ISE）的响应机理。已显示ISE通过表面离子交换机制运行，而没有离子通过膜的扩散。已显示离子选择性取决于溶剂介体，该介体增加了膜表面对硝酸盐的渗透性，从而允许发生离子交换。对于这种类型的电极，提出了一种新的分类子类别。 [参考：21]

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