Regeneration of reference electrode of acid-base concentration meter
(1) Junction of soaking solution: use a mixture of 10% saturated potassium chloride solution and 90% distilled water, heat to 60-70°C, immerse the electrode about 5cm, and soak for 20 minutes to 1 hour. This method can dissolve the crystals at the end of the electrode.
(2) Ammonia soaking: When the liquid junction is blocked by silver chloride, it can be soaked with concentrated ammonia water. The specific method is to clean the inside of the electrode, drain the liquid and immerse it in ammonia water for 10-20 minutes, but do not let the ammonia water enter the inside of the electrode. Take out the electrode and wash it with distilled water, and then add the filling liquid again and continue to use it.
(3) Vacuum method: put the hose around the liquid junction of the reference electrode, use a water flow suction pump, and the liquid filled in the suction part passes through the liquid junction to remove mechanical blockages.
(4) Boiling liquid 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 boil.
(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 grit under grinding to plug into the liquid junction. cause permanent blockage.
