Solid contact ion-selective electrode
First Claim
1. A solid contact ion-selective electrode comprising a substrate comprising a conductive and porous carbon matrix, wherein the interfacial potential of said electrode is fixed by the presence of a metal M and metal salt MX in said substrate, and wherein the presence of an aqueous layer is substantially eliminated, so that the electrode contains essentially no aqueous solution or air bubbles.
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Abstract
A new substrate for the construction of solid internal contact ion-selective electrode comprising a conductive and porous carbon matrix is described. The well-defined (i.e., fixed) interfacial potential between the organic electroactive phase and the internal reference element, coupled with the electrode'"'"'s very slow change from water activity at the internal reference element, supports the well-behaved and reproducible electrode operation. Solid contact sensors for two different ions were constructed, and their potentiometric behavior was compared with their symmetric counterparts. The potentiometric response was monitored over a period of one month with excellent results for drift, base line stability, response time, selectivity, and detection limit.
24 Citations
7 Claims
- 1. A solid contact ion-selective electrode comprising a substrate comprising a conductive and porous carbon matrix, wherein the interfacial potential of said electrode is fixed by the presence of a metal M and metal salt MX in said substrate, and wherein the presence of an aqueous layer is substantially eliminated, so that the electrode contains essentially no aqueous solution or air bubbles.
Specification