New method for determining the concentration of ionic impurities in solvent polymeric membranes

被引：47

作者：

Nagele, M ^{[1
]}

Pretsch, E ^{[1
]}

机构：

[1] ETH ZURICH,DEPT ORGAN CHEM,CH-8092 ZURICH,SWITZERLAND

来源：

MIKROCHIMICA ACTA | 1995年 / 121卷 / 1-4期

关键词：

ionic sites; PVC; Tecoflex(R); ion-selective electrodes;

D O I：

10.1007/BF01248256

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new method is proposed for ascertaining the amount of ionic impurities in solvent polymeric membranes of ion-selective electrodes. The method is based on determining the selectivity coefficient for ions of different valences as a function of the concentration of a lipophilized tetraphenylborate salt added to the membrane phase. Thus, the concentration of anionic impurities in commercially available poly(vinyl chloride) and of cationic ones in Tecoflex(R) (a polyurethane) was obtained as 0.063 +/- 0.016 and 0.044 +/- 0.006 mmol/kg, respectively.

引用

页码：269 / 279

页数：11

共 39 条

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