Buffer overcoat for CO.sub.2 ion-selective electrodes
First Claim
1. In an ion-selective electrode for analyzing CO2 concentration in a liquid comprising a support having thereon a layer or layers having sequentially metal/metal halide reference electrode zones, an electrolyte zone and a membrane zone containing an ionophore, the improvement wherein said membrane zone is positioned between said electrolyte zone and an adjacent zone comprising a hydrophilic binder and a buffer in an amount sufficient to provide a solution having a pH in the range of 7.5 to 9.5 when wetted with about 5 μ
- l of liquid to be analyzed.
2 Assignments
0 Petitions
Accused Products
Abstract
An ion-selective electrode for analyzing CO2 concentration in a liquid sample comprises a support having thereon a metal zone, a metal halide zone, an electrolyte zone, a zone comprising a membrane comprising an ionophore and a zone comprising a hydrophilic binder and a buffer in an amount sufficient to provide a solution having a pH in the range of about 7.5 to 9.5 when wetted with about 5 μl of liquid.
27 Citations
18 Claims
-
1. In an ion-selective electrode for analyzing CO2 concentration in a liquid comprising a support having thereon a layer or layers having sequentially metal/metal halide reference electrode zones, an electrolyte zone and a membrane zone containing an ionophore, the improvement wherein said membrane zone is positioned between said electrolyte zone and an adjacent zone comprising a hydrophilic binder and a buffer in an amount sufficient to provide a solution having a pH in the range of 7.5 to 9.5 when wetted with about 5 μ
- l of liquid to be analyzed.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18)
-
10. In a process of preparing an ion-selective electrode for analyzing CO2 concentration in a liquid comprising coating a support with, in succession, layers of metal, metal halide, electrolyte layer and a membrane layer comprising an ionophore, the improvement wherein the membrane layer is overcoated with a layer comprising a hydrophilic binder and a buffer in an amount sufficient to provide a solution having a pH in the range of from about 7.5 to 9.5 when wetted with 5 μ
- l of liquid to be analyzed.
- View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
Specification