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 Naq and Kq ions, the effect of ionic strength and of temperature. The sensitivity of the ammonium detection was around
30 mVrpNHq and the detection limit 2=10y6 M. Trichlorfon as a common pesticide is detected using a BuChE–FET sensor which is 4
prepared either with cross-linked BSA–glutaraldehyde membrane or photocross-linkable PVArSbQ poly vinyl alcohol containing ŽŽ .
styrylpyridinium membrane. PVA . rSbQ 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: 10y6 M. q 1999 Elsevier Science S.A. All rights reserved.
Different types of polymeric matrices were tested in order to optimize the characteristics of the specific ISFETs developed for thedetection of an ionic pollutant, the ammonium ion and of a molecular pollutant, the trichlorfon which is a common organophosphoruspesticide. A miniaturized sensor for ammonium detection, based on the integration of both ammonium and reference FETs in a singlechip, was fabricated. A differential measurement mode between both FETs was used, this mode of measurement allowed to reduceinterferences of Naq and Kq ions, the effect of ionic strength and of temperature. The sensitivity of the ammonium detection was around30 mVrpNHq and the detection limit 2=10y6 M. Trichlorfon as a common pesticide is detected using a BuChE–FET sensor which is 4prepared either with cross-linked BSA–glutaraldehyde membrane or photocross-linkable PVArSbQ poly vinyl alcohol containing ŽŽ .styrylpyridinium membrane. PVA . rSbQ membrane shows better characteristics compared to BSA membrane: larger linear dynamicrange in kinetic mode, better reproducibility, and above all, better stability in storage. Nevertheless, both membranes present the samedetection limit for trichlorfon: 10y6 M. q 1999 Elsevier Science S.A. All rights reserved.
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