The pH meter 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 fast balancing. When in use, 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 in the electrode. The following is a brief introduction to The use and maintenance of pH meter electrodes:
1. When the composite electrode is not in use, it can be fully soaked in 3M potassium chloride solution. Do not immerse with washing liquid 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 without cracks; the bulb should be filled with solution without bubbles.
3. When measuring a solution with a large concentration, try to shorten the measurement time as much as possible, and clean it carefully after use to prevent the measured liquid from adhering to the electrode and contaminating the electrode.
4. After cleaning the electrode, do not wipe the glass membrane with filter paper, but use filter paper to dry it to avoid damage to the glass membrane, prevent cross-contamination, and affect the measurement accuracy.
5. During the measurement, pay attention to the silver-silver chloride internal reference electrode of the electrode should be immersed in the chloride buffer solution in the bulb to avoid the phenomenon of digital jumping in the display part of the electric meter. When using, pay attention to gently shake the electrode a few times.
6. The electrode cannot be used in strong acid, strong alkali or other corrosive solutions.
7. It is strictly forbidden to use in dehydrating media such as absolute ethanol, potassium dichromate, etc.
