Electrolyte analyzer is a commonly used analytical instrument product, which is used to detect potassium ions, sodium ions, chloride ions, ionized calcium and lithium ions from samples. Today we will mainly introduce the working principle and main features of the electrolyte analyzer, hoping to help users better apply the product.
Working principle of electrolyte analyzer
Electrolyte analyzers use ion-selective electrode measurement to achieve detection. There are six types of electrodes on the instrument: sodium, potassium, chloride, ionized calcium, lithium and reference electrode. Each electrode has an ion-selective membrane that will interact with the measured The corresponding ions in the sample react. The membrane is an ion exchanger. It reacts with the ion charge to change the membrane potential, and the potential between the liquid, the sample and the membrane can be detected. The two potential differences detected on both sides of the membrane will generate current , The sample, the reference electrode, and the reference electrode solution constitute one side of the "loop", the membrane, the internal electrode solution, and the internal electrode on the other side.
The difference in ion concentration between the internal electrode solution and the sample will generate an electrochemical voltage on both sides of the working electrode's membrane. The voltage is led to the amplifier through the highly conductive internal electrode, and the reference electrode is also led to the location of the amplifier. By detecting a known one The standard solution of ion concentration obtains a calibration curve to detect the ion concentration in the sample.
When the measured ions in the solution contact the electrode, ion migration occurs in the aqueous layer of the ion-selective electrode matrix. The charge of the migrated ions changes and there is a potential, which changes the potential between the membrane surfaces. Between the measuring electrode and the reference electrode Create a potential difference.
