All-solid-state calcium solvent polymeric membrane electrode for low-level concentration measurements

被引：72

作者：

Michalska, A ^{[1
]}

Konopka, A ^{[1
]}

Maj-Zurawska, M ^{[1
]}

机构：

[1] Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland

来源：

ANALYTICAL CHEMISTRY | 2003年 / 75卷 / 01期

关键词：

D O I：

10.1021/ac025916y

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An all-solid-state calcium-selective electrode with a plastic membrane phase containing a calcium ionophore ETH-1001 placed on poly(3-methylthiophene) ion-to-electron transducting layer functionalized to bind calcium cations has been constructed. The obtained potentiometric sensors were characterized with a calibration line of slope close to Nernstian within the activity from 10(-5) to 0.1 M. For Ca2+ activity lower than 10(-5) M, super-Nernstian behavior was observed. The super-Nernstian response that is observed for electrodes with an internal solution strongly binding primary ions was in this case attributed to incorporation of calcium ions in the modified solid-contact phase. With this arrangement, the evaluation of selectivity coefficients much closer to those that depend on the properties of the ion-selective membrane itself was possible.

引用

页码：141 / 144

页数：4

共 28 条

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