Overcoming the pH dependency of optical sensors: a pH-independent chloride sensor based on co-extraction

被引：19

作者：

Huber, C

Werner, T ^{[1
]}

Krause, C

Wolfbeis, OS

Leiner, MJP

机构：

[1] Univ Regensburg, Inst Analyt Chem, D-93040 Regensburg, Germany

[2] AVL GmbH, Div Biomed, A-8020 Graz, Austria

来源：

ANALYTICA CHIMICA ACTA | 1999年 / 398卷 / 2-3期

关键词：

emulsion; chloride; optical sensor; co-extraction; pH independence;

D O I：

10.1016/S0003-2670(99)00414-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A chloride-selective optode is presented which is based on a polymer-stabilized emulsion system which consists of a hydrogel into which plasticizer droplets are incorporated containing a neutral chloride-selective ionophore. A solvatochromic cationic fluorescent dye is located in the hydrogel. When the ionophore extracts chloride out of the aqueous solution into the plasticizer droplets, the positively charged dye is co-extracted for reasons of electroneutrality. This concerted reaction causes a decrease of micro-polarity near the dye, resulting in an increase of its fluorescence intensity along with a bathochromic shift of the emission maximum. This system can be used for pH-independent reversible sensing of chloride in the 10-100 mM concentration range with response times of the order of 3 min. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：137 / 143

页数：7

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