Chemical signal-impermeable mask

Details Chemical signal-impermeable mask Chemical signal-impermeable mask

G - Physics

01

N

G01N 27/30 (2006.01) A61B 5/00 (2006.01) A61N 1/30 (2006.01) C12M 1/40 (2006.01) C12Q 1/00 (2006.01) C12Q 1/54 (2006.01)

Patent

CA 2229509

A chemical signal-impermeable mask (1) is positioned in the electrolyte flow such that the mask is between a source of chemical signal and a working electrode (4) which senses the chemical signal transported from the source (e.g., by diffusion). The configuration of the mask is such that the mask prevents substantially all chemical signal transport from the chemical signal source/having a radial vector component relative to a plane of the mask/and the catalytic face of the working electrode, thus allowing primarily only chemical signal transport that is substantially perpendicular to the place of the mask and the catalytic surface (6) of the working electrode. By reducing or eliminating chemical signal radial transport toward the working electrode, the mask thus significantly reduces or eliminates edge effects. By substantially reducing edge effects created by radial transport of chemical signal, it is possible to obtain a more accurate measurement of the amount (e.g., concentration) of chemical signal that is transported from a given area of source material.

On place un masque (1) imperméable aux signaux chimiques dans le courant d'électrolyte de manière à ce que le masque se situe entre la source du signal chimique et une électrode de travail (4) détectant le signal chimique provenant de la source (par exemple par diffusion). La configuration du masque empêche sensiblement tout transport de signaux chimiques entre la source de signaux chimiques, dont le vecteur présente une composante radiale par rapport à un plan du masque, et la surface catalytique de l'électrode de travail, ce qui ne permet que le transport des signaux chimiques sensiblement perpendiculaires à l'emplacement du masque et à la surface catalytique (6) de l'électrode de travail. En réduisant ou en éliminant le transport radial de signaux chimiques vers l'électrode de travail, le masque réduit ou élimine les effets de bord et permet par là d'obtenir une mesure plus précise de la quantité (c.-à-d. de la concentration) du signal chimique transporté depuis une zone donnée du matériau source.

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