What are the methods of PH meter in daily maintenance
The H meter refers to an instrument used to measure the pH value of a solution. The pH meter works 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 not only related to the properties of the electrode itself, but also related to 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. PH meter is a common analytical instrument widely used in agriculture, environmental protection and industry. Soil pH is one of the most important basic properties of soil. Factors such as the temperature and ionic strength of the solution to be tested should be considered in the pH determination process.
1. When the composite pH electrode is not in use, it can be fully soaked in 3mol/L potassium chloride solution and must not be soaked with washing liquid or other water-absorbing reagents.
2. Before use, check the bulb at the front of the glass pH electrode. Under normal circumstances, the pH electrode should be transparent without cracks; the bulb should be filled with solution without air bubbles.
3. When measuring a solution with a high concentration, shorten the measurement time as much as possible, and wash it carefully after use to prevent the measured solution from adhering to the pH electrode and polluting the pH electrode.
4. After cleaning the pH electrode, do not wipe the glass membrane with filter paper, but dry it with filter paper to avoid damage to the glass membrane, prevent cross-contamination, and affect measurement accuracy.
5. Pay attention to the silver-silver chloride internal reference pH electrode of the pH electrode during the measurement. When using, pay attention to gently shake the pH electrode a few times.
6. The pH electrode cannot be used for strong acid, strong alkali or other corrosive solutions.
7. It is strictly forbidden to use in dehydrating medium such as absolute ethanol, potassium dichromate, etc.
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