APPLICABILITY OF THE PHASE-BOUNDARY POTENTIAL MODEL TO THE MECHANISTIC UNDERSTANDING OF SOLVENT POLYMERIC MEMBRANE-BASED ION-SELECTIVE ELECTRODES
APPLICABILITY OF THE PHASE-BOUNDARY POTENTIAL MODEL TO THE MECHANISTIC UNDERSTANDING OF SOLVENT POLYMERIC MEMBRANE-BASED ION-SELECTIVE ELECTRODES
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DOI：
10.1002/elan.1140070906
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发表时间：
1995-09-01
期刊：
影响因子：
3
通讯作者：
PRETSCH, E
中科院分区：
文献类型：
--
作者：
BAKKER, E;NAGELE, M;PRETSCH, E
最近的实验证据表明，样品/膜界面处的样品离子的平衡分配是支配基于聚合物膜的离子选择性电极（ISE）的电位响应的主要参数。结果表明，基于中性载体的H+-选择性电极的响应可以完全预测的基础上测量的平衡浓度的光学内具有相同的组成的伊势膜的薄的有机他。因此，使用这种简单而强大的相边界电位模型与质量平衡和观察到的复杂的形成常数，各种伊势膜的响应和选择性可以被描述。本文综述了该模型的最新应用，包括：（1）一种新的和通用的选择性描述，它与所谓的匹配势方法有关，清楚地表明了扩展的Nicolsky-Eisenman方程在考虑不同电荷离子时的局限性;（2）中性载流子离子选择性离子选择性电极的测量范围，表明以前的实验结果现在可以用理论解释;（3）预测阴离子和阳离子位点对基于带电载体的ISE的选择性的影响，表明这种伊势膜需要掺入与分析物离子相同电荷类型的位点以诱导最佳电位选择性;和（4）通过测量阴离子位点浓度对基于中性载体的伊势的二价/一价离子选择性的影响来测定聚（氯乙烯）中阴离子杂质的浓度。
Recent experimental evidence suggests that the equilibrium partitioning of sample ions at the sample/membrane interface is the main parameter governing the potentiometric response of polymeric membrane-based ion-selective electrodes (ISEs). It is shown that the response of a neutral-carrier-based H+-selective electrode can be fully predicted on the basis of equilibrium concentrations measured optically within a thin organic him having the same composition as the ISE membrane. Consequently, using this simple and powerful phase boundary potential model together with mass balances and observed complex formation constants, the response and selectivity of various ISE membranes may be described. In this contribution, the most recent applications of the model are reviewed including: (1) a novel and general selectivity description, which is related to the so-called matched potential method and clearly shows the limitations of the extended Nicolsky-Eisenman equation if ions of different charge are considered; (2) the measuring range of neutral-carrier-based H+-selective ISEs, showing that previous experimental findings can now be explained by theory; (3) prediction of the influence of anionic and cationic sites on the selectivity of charged-carrier-based ISEs demonstrating that such ISE membranes need the incorporation of sites of the same charge type as the analyte ion to induce optimum potentiometric selectivity; and (4) the determination of the concentration of anionic impurities in poly(vinyl chloride) by measuring the influence of the anionic site concentration on the divalent/monovalent ion selectivity of a neutral-carrier-based ISE.