Cation-selective sensor
First Claim
1. Cation-selective sensor for the qualitative and/or quantitative determination of cations in solutions, characterized in thatthe cation-selective sensor contains at least one ionically conducting cation-specific layer which is in contact with the solution and is made of a liquid, solid or semi-solid material, in that this layer contains coupling elements which selectively remove the cations from the solution, so that the resistance, conductance, admittance or impedance of the layer is changed by cation uptake, in that the cation-specific layer contains at least one acid/base component, and in that the sensor comprises at least two electrodes, at least one of which is connected to the cation-specific layer.
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Abstract
The invention concerns a cation-selective sensor provided with a cation-selective coating and based on the fact that analyte ions present in a solution cause detectable changes in the electrical characteristics of the layer. The acid/base components in the cation-selective layer render the sensor function independent of the anions present in the analyte solution. This improves the measurement accuracy and lowers the detection threshold.
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Citations
27 Claims
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1. Cation-selective sensor for the qualitative and/or quantitative determination of cations in solutions, characterized in that
the cation-selective sensor contains at least one ionically conducting cation-specific layer which is in contact with the solution and is made of a liquid, solid or semi-solid material, in that this layer contains coupling elements which selectively remove the cations from the solution, so that the resistance, conductance, admittance or impedance of the layer is changed by cation uptake, in that the cation-specific layer contains at least one acid/base component, and in that the sensor comprises at least two electrodes, at least one of which is connected to the cation-specific layer.
Specification