What is pH meter electrode protective solution
A pH meter refers to an instrument used to determine the acidity or alkalinity of a solution. A pH meter operates based on the principle of a primary battery. The electromotive force between the two electrodes of the primary battery is determined by Nernst's law, which is related to both the electrode properties and the concentration of hydrogen ions in the solution. There is a corresponding relationship between the electromotive force of the primary battery and the concentration of hydrogen ions, and the negative logarithm of the concentration of hydrogen ions is the pH value. A pH meter is a common analytical instrument widely used in fields such as agriculture, environmental protection, and industry.
The pH meter electrode protective solution is a liquid used to protect the pH meter electrode, mainly composed of potassium chloride, preservatives, etc. The electrodes used in the laboratory are all composite electrodes, which have the advantages of being easy to use, not affected by oxidizing or reducing substances, and having a fast equilibrium speed. When using, remove the rubber sleeve on the electrode filling port and the rubber sleeve at the bottom to maintain the hydraulic pressure difference of the potassium chloride solution inside the electrode. The pH meter protective solution usually uses saturated KCL solution, but it should be noted that some imported electrodes, such as Mettler Toledo, Sartorius, and Hash, use 3mol/L KCL. Some electrode protective solutions require silver ions, so before preparing, it is necessary to read the instructions and confirm the condition of the electrolyte before choosing how to prepare.
Instrument mV zone error or incorrect measurement
Reason for malfunction: 1) When the input potential exceeds the measurement range, the instrument will display the word "Err" in the mV area; 2) Poor electrode performance; 3) Measurement channel setting error; 4) Poor contact of electrode plug.
Exclusion method: 1) Reduce the input value; 2) Replace the electrode with a new one; 3) Reset the measurement channel; 4) Connect the short-circuit plug, the instrument should display around 0.0mV, otherwise there is a problem with the pH measurement unit.
