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
收藏
页码：137 / 143
页数：7
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