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1. Short-term storage of pH glass electrodes: Store in pH=4 buffer; long-term: Store in pH=7 buffer solution. 2, pH glass electrode cleaning Glass electrode bulb contamination may make the electrode response time longer. Can use CCl4 or soap to remove dirt, and then dip in distilled water and continue using it overnight. When the pollution is serious, it can be soaked with 5% HF solution for 10-20 minutes, rinsed immediately with water, and then immersed in 0.1N HCl solution for a whole day and night.
3. Treatment of Glass Electrode Aging The aging of glass electrodes is related to the gradual change of the adhesive layer structure. The old electrode responds slowly, the membrane resistance is high, and the slope is low. Exfoliating the outer layer with hydrofluoric acid can often improve the electrode performance. If this method can be used regularly to remove the inner and outer layers, the electrode life is almost unlimited.
4. Storage of the Reference Electrode The best storage solution for silver-silver chloride electrodes is a saturated potassium chloride solution. A high concentration of potassium chloride solution can prevent the precipitation of silver chloride at the liquid junction and maintain the liquid junction at work. status. This method is also suitable for storage of composite electrodes.
5, the reference electrode regeneration of the reference electrode occurred in the vast majority of problems caused by the liquid junction blockage, can be solved by the following methods: (1) soaking solution junction: with 10% saturated potassium chloride solution and 90% distilled water The mixture was heated to 60-70[deg.] C. and the electrode was immersed for about 5 cm and soaked for 20 minutes to 1 hour. This method dissolves the crystallization of the electrode tip. (2) Ammonia soaking: When the liquid junction is blocked by silver chloride, it can be soaked with concentrated ammonia. The specific method is to wash the electrode and dip the liquid into ammonia water for 10 to 20 minutes after emptying, but do not allow ammonia to enter the interior of the electrode. Take out the electrode and wash it with distilled water. Continue to use it after adding it again. (3) Vacuum method: Put the hose on the junction of the reference electrode and use the water suction pump. The liquid in the suction part passes through the liquid junction to remove the mechanical plug. (4) Boiler fluid junction: The liquid junction of the silver-silver chloride reference electrode is immersed in boiling water for 10 to 20 seconds. Note that the electrode should be cooled to room temperature before the next boiling. (5) When the above methods are ineffective, the mechanical method of sandpaper grinding can be used to remove the blockage. This method may cause the grinded sand to plug into the liquid junction. Cause permanent blockages.
Ph meter maintenance method:
At present, the electrodes used in the laboratory are all composite electrodes, which have the advantages of being easy to use, free of oxidizing or reducing substances, and having a faster equilibration speed. In use, the rubber sleeve and the rubber sleeve at the lower end of the electrode filling port are completely removed to maintain the hydraulic pressure difference of the potassium chloride solution in the electrode. Here's a simple introduction to the use and maintenance of the electrode:
1. When the composite electrode is not used, it can be fully immersed in 3M potassium chloride solution. Never wash with wash solution or other absorbent agents.
2. Before use, check the bulb at the front of the glass electrode. Under normal conditions, the electrode should be transparent and free from cracks; the bulb should be filled with a solution and no bubbles should be present.
3. When measuring a solution with a large concentration, try to shorten the measurement time as much as possible and carefully clean it after use to prevent the test liquid from adhering to the electrode and contaminating the electrode.
4. After cleaning the electrode, do not wipe the glass film with filter paper, but use filter paper to dry it to avoid damage to the glass film and prevent cross-contamination, affecting the measurement accuracy. 5. The silver-silver chloride internal reference electrode of the measurement electrode should be immersed in the chloride buffer solution in the bulb to avoid the phenomenon of digital chattering in the display part of the electricity meter. When using, pay attention to gently swing the electrode.
6. The electrode cannot be used for strong acids, alkalis or other corrosive solutions.
7. It is strictly prohibited to use in dehydrating medium such as anhydrous ethanol, potassium dichromate, etc.
Storage of pH glass electrodes: short term: stored in buffer solution with pH=4; long term: stored in buffer solution with pH=7.
Cleaning of pH Glass Electrodes: Contamination of glass electrode bulbs may increase the response time of the electrodes. Can use CCl4 or soap to remove dirt, and then dip in distilled water and continue using it overnight. When the pollution is serious, it can be soaked with 5% HF solution for 10-20 minutes, rinsed immediately with water, and then immersed in 0.1N HCl solution for a whole day and night.
Ph meter maintenance and maintenance methods
Ph meter maintenance methods: