Reference Electrode Salt Bridge Polymer Matrix Leaching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional potentiometric sensors' reference electrodes suffer from contamination and potential drift due to chloride leaching and cross-sensitivity from redox-active substances, leading to inaccurate measurements.
Innovation Solution
A reference electrode with a salt bridge composed of a polymer matrix and a conducting salt, where the cation and/or anion are kept from leaching through interactions or bonds, ensuring low diffusion potentials and reduced chloride release, thereby stabilizing the reference potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional reference electrode with salt bridge is used, then electrical contact with measuring medium is achieved, but chloride leaching and contamination occur leading to potential drift
Solution Approach 1:
The patent applies composite materials by combining a polymer matrix with conducting salt particles to create a salt bridge composite. This composite structure prevents chloride leaching while maintaining ionic conductivity, resolving the contradiction between reliability and harmful factors generated by conventional reference electrodes
2Quantity of substance
If conducting salt is added to polymer matrix to enhance conductivity, then ionic strength increases, but chloride leaching may increase
Solution Approach 1:
The patent applies local quality by distributing conducting salt particles locally within the polymer matrix structure. This localized distribution maintains high ionic strength and conductivity in the salt bridge region while the polymer matrix structure locally prevents chloride leaching, resolving the contradiction between quantity of substance and loss of substance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents chloride leaching and reduces cross-sensitivity, maintaining stable reference potentials and improving measurement accuracy by embedding conducting salts within a polymer matrix, which enhances the ionic strength and conductivity of the salt bridge.
Implementation Method 1
a salt bridge provided for contact with a measuring fluid and a medium electrically conductively, or at least ionically conductively, connecting the electrical conductor and the salt bridge to each other, where the medium and the electrical conductor are completely isolated with respect to the measuring medium... where the cation and/or anion are at least partially kept from leaching in the polymer matrix
Implementation Method 2
a salt bridge comprises a polymer matrix and a conducting salt, where the conducting salt is formed from a cation and an anion... electrically conductively, or at least ionically conductively, connecting the electrical conductor and the salt bridge
Implementation Method 3
A material transport from the reference electrolyte into the measuring medium and in the opposite direction is possible via the salt bridge
Data Source
AI summary
The present disclosure relates to a reference electrode including an electrical conductor, an electrically conductive salt bridge provided for contact with a measuring fluid, and a medium electrically conductively connecting the electrical conductor and the salt bridge to each other, wherein the medium and the electrical conductor are completely isolated with respect to the measuring fluid. The salt bridge comprises a polymer matrix and a conducting salt, the conducting salt is formed from a cation and an anion, and the cation and/or the anion are at least partially kept from leaching in the polymer matrix. The present disclosure further relates to an electrochemical sensor, a method for producing the reference electrode and a method for regenerating and/or conditioning the reference electrode.