ISFET microsensors for the detection of pollutants in liquid media

被引：34

作者：

Jaffrezic-Renault, N ^{[1
]}

Senillou, A ^{[1
]}

Martelet, C ^{[1
]}

Wan, K ^{[1
]}

Chovelon, JM ^{[1
]}

机构：

[1] Ecole Cent Lyon, UMR 5621, Lab Ingn & Fonctionnalisat Surfaces, F-69131 Ecully, France

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1999年 / 59卷 / 2-3期

关键词：

ISFET; ENFET; differential measurements; PVC; PVA/SbQ; ammonium; organophosphorous pesticides; butyrylcholine esterase;

D O I：

10.1016/S0925-4005(99)00213-0

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Different types of polymeric matrices were tested in order to optimize the characteristics of the specific ISFETs developed for the detection of an ionic pollutant, the ammonium ion and of a molecular pollutant, the trichlorfon which is a common organophosphorus pesticide. A miniaturized sensor for ammonium detection, based on the integration of both ammonium and reference FETs in a single chip, was fabricated. A differential measurement mode between both FETs was used, this mode of measurement allowed to reduce interferences of Na+ and K+ ions, the effect of ionic strength and of temperature. The sensitivity of the ammonium detection was around 30 mV/pNH(4)(+) and the detection limit 2 x 10(-6) M. Trichlorfon as a common pesticide is detected using a BuChE-FET sensor which is prepared either with cross-linked BSA-glutaraldehyde membrane or photocross-linkable PVA/SbQ (poly(vinyl alcohol) containing styrylpyridinium) membrane. PVA/SbQ membrane shows better characteristics compared to BSA membrane: larger linear dynamic range in kinetic mode, better reproducibility, and above all, better stability in storage. Nevertheless, both membranes present the same detection limit for trichlorfon: 10(-6) M. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：154 / 164

页数：11

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