A chronoamperometric method to estimate changes in the membrane composition of ion-selective membranes

被引：39

作者：

Pendley, BD

Gyurcsanyi, RE

Buck, RP

Lindner, E ^{[1
]}

机构：

[1] Univ Tennessee, Hlth Sci Ctr, Herff Coll Engn, Memphis, TN 38152 USA

[2] Univ Memphis, Joint Grad Program Biomed Engn, Memphis, TN 38152 USA

[3] Rhodes Coll, Dept Chem, Memphis, TN 38112 USA

[4] Hungarian Acad Sci, Res Grp Tech Analyt Chem, H-1111 Budapest, Hungary

[5] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

来源：

ANALYTICAL CHEMISTRY | 2001年 / 73卷 / 19期

关键词：

D O I：

10.1021/ac010007e

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new chronoamperometric method is used to estimate changes in the membrane composition of mobile-site, ionophore-based membranes. The characteristic features of the chronoamperometric curves (initial current, slope, break time) of valinomycin-based, potassium-selective membranes loaded with potassium tetrakis(4-chlorophenyl)borate are correlated with the mobile-site and free ionophore concentration in the membrane. Limiting cases for strong and negligible ion pair formation are distinguished. Replicate measurements indicate a relative standard deviation in the calculated values less than 10%. The practical applicability of the method was tested with membranes incorporated into conventional ion-selective electrode bodies or cast onto microfabricated planar sensor structures.

引用

页码：4599 / 4606

页数：8

共 25 条

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