ISFET microsensors for the detection of pollutants in liquid media
| Autor: | Claude Martelet, K Wan, Nicole Jaffrezic-Renault, J.M. Chovelon, Anne Senillou |
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| Rok vydání: | 1999 |
| Předmět: |
Detection limit
Vinyl alcohol Metals and Alloys Analytical chemistry Ionic bonding Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound Membrane chemistry Ionic strength Materials Chemistry Ammonium Electrical and Electronic Engineering ISFET Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 59:154-164 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/s0925-4005(99)00213-0 |
| Popis: | 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 2×10 −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. |
| Databáze: | OpenAIRE |
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