How to use a pH meter and maintain electrodes correctly?
At present, the electrodes used in the laboratory are all composite electrodes, which have the advantages of being convenient 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 lower end to maintain the hydraulic pressure difference of the potassium chloride solution inside the electrode. Below is a brief introduction to the use and maintenance of electrodes:
When the composite electrode is not in use, it can be fully immersed in a 3M potassium chloride solution. Avoid soaking with detergent or other absorbent reagents.
2. Before use, check the bulb at the front end of the glass electrode. Under normal circumstances, the electrode should be transparent and free of cracks; The bubble should be filled with solution and there should be no bubbles present.
When measuring solutions with high concentrations, try to shorten the measurement time as much as possible. After use, clean carefully to prevent the measured solution from adhering to the electrode and contaminating it.
4. After cleaning the electrodes, do not use filter paper to wipe the glass film. Instead, use filter paper to absorb it dry to avoid damaging the glass film, preventing cross contamination, and affecting measurement accuracy.
During measurement, pay attention to the silver chloride internal reference electrode of the electrode. The electrode should be immersed in the chloride buffer solution inside the bulb to avoid the occurrence of digital jumping in the display part of the electrometer. When using, be careful to gently shake the electrode a few times.
6. Electrodes should not be used in strong acids, bases, or other corrosive solutions.
7. It is strictly prohibited to use in dehydrating media such as anhydrous ethanol, potassium dichromate, etc.
