Sensor devices and analytical method

G - Physics – 01 – N

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G01N 27/416 (2006.01) G01N 27/40 (2006.01) G01N 27/403 (2006.01)

Patent

CA 2313795

Sensor systems and devices with a detecting (especially ion-selective or redox) electrode and reference electrode with the detecting electrode (and preferably both electrodes) covered by a permeable barrier interfacing with samples under examination so that the main bridging contact between the electrodes to complete a measuring circuit is not through the sample. The permeable barrier encloses a liquid zone (e.g. electrolyte) at the electrodes and controls, by restricting diffusion, the passage of analytes and impurities in either direction through the barrier. The main function of the permeable barrier is to slow the rate of diffusion of analyte. More rapid identification of the analyte content in a sample can be facilitated, e.g. by "loading" the liquid zone with analyte or impurity to control diffusion. The strongly preferred method for analyte determination is based on using measurements of the rate of change of the detecting electrode's output potential as analyte diffuses through the barrier.

L'invention porte sur des systèmes et dispositifs de détection comportant une électrode de détection (en particulier sélectrice d'ions ou redox) et une électrode de référence l'une ou toutes deux étant recouvertes d'une barrière perméable touchant l'échantillon à examiner de manière à ce que le principal contact entre les électrodes lorsqu'on constitue un circuit de mesure ne passe pas par l'échantillon. La barrière perméable renferme une zone de liquide (par exemple d'électrolyte) au niveau des électrodes et commande en le restreignant le passage dans les deux sens des analytes et impuretés à travers la barrière. La fonction principale de la barrière perméable est de ralentir la diffusion de l'analyte. L'identification du contenu d'analyte peut être plus rapide si l'on charge la zone liquide en analyte ou impureté pour réguler la diffusion. La méthode de loin préférée de détection de l'analyte se base sur des mesures du taux de variation du potentiel alors que l'analyte diffuse à travers la barrière.

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