What is the pH meter electrode protection solution?
pH meter refers to an instrument used to measure the pH value of a solution. The pH meter works based on the principle of a primary battery. The electromotive force between the two electrodes of the primary battery is based on Nernst's law, which is related to both the properties of the electrodes and the concentration of hydrogen ions in the solution. There is a corresponding relationship between the electromotive force of the primary battery and the hydrogen ion concentration. The negative logarithm of the hydrogen ion concentration is the pH value. pH meter is a common analytical instrument widely used in agriculture, environmental protection, industry and other fields.
pH meter electrode protection liquid is a liquid that protects the pH meter electrode. It is mainly composed of potassium chloride, preservatives, etc. The electrodes used in the laboratory are all composite electrodes. Their advantages are that they are easy to use, not affected by oxidizing or reducing substances, and have a fast equilibrium speed. When in use, remove the rubber sleeve on the electrode filling port and the rubber sleeve on the lower end to maintain the hydraulic pressure difference of the potassium chloride solution in the electrode. The pH meter protection solution usually uses a saturated KCL solution, but it should be noted that some imported electrodes, such as Mettler-Toledo, Sartorius and Hach, all use 3mol/L KCL. Some electrode protection solutions Silver ions are required, so before preparation, you should read the instructions first, confirm the condition of the electrolyte, and then choose how to prepare it.
Why use klcl as pH meter electrode protection solution?
To keep the pH of the membrane constant.
The membrane of the pH electrode is made of potassium-containing glass, with a KCl saturated solution inside as an internal reference solution. In order to make the ion exchange on the glass membrane reach the standard state after use, it needs to be soaked in KCl, which will protect the electrode. , can effectively prevent the loss of the reference solution, extend the use time of the electrode, and keep its original pH potential balance unchanged, so that the measurement will be more accurate. The protective solution for the H electrode is 3mol/L KCl solution (KCL is a neutral solution).
PH meter electrode protection liquid is a liquid that protects the PH meter electrode and is mainly composed of preservatives. The electrodes used in the laboratory are all composite electrodes. Their advantages are that they are easy to use, not affected by oxidizing or reducing substances, and have a fast equilibrium speed.
