Polarographic chemical sensor with external reference electrode

Details Polarographic chemical sensor with external reference electrode Polarographic chemical sensor with external reference electrode

G - Physics

01

N

G01N 27/30 (2006.01) G01N 27/327 (2006.01) G01N 27/333 (2006.01) G01N 27/416 (2006.01) G01N 27/48 (2006.01)

Patent

CA 2072885

An electroanalytical electrode assembly comprises an electrically conductive working electrode which includes an electrical conductor (15) having a body of electrolyte material (16) thereupon and separated from the analytical environment by a hydrophobic membrane (18). The membrane has an electrical conductivity greater than the electrical conductivity of the remainder of the measuring circuit and is selectably permeable for a preselected and ionic species, so as to provide a stable membrane potential. Use of an assembly of this type allows for placement of a reference electrode (20) external of the membrane (18).

Ensemble à électrode électroanalytique comportant une électrode de travail électro-conductrice qui comprend un conducteur électrique (15), dont le corps est composé de matière électrolytique (16), séparé de l'environnement analytique par une membrane hydrophobe (18). La membrane présente une conductivité électrique plus importante que le reste du circuit de mesure et est sélectivement perméable à une espèce ionique présélectionnée, de façon à offrir un potentiel de membrane stable. L'utilisation de ce genre d'ensemble nous permet de placer une électrode de référence (20) à l'extérieur de la membrane (18).

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