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solution for 10 to 20 minutes, immediately rinse with water, and then immersed in 0.1N HCl
solution for 24 hours and then continue use.
3. Glass electrode aging treatment: the aging of the glass electrode and the gradual change in the
structure of the glue layer. Old electrode response is slow, film resistance is high, slope is low.
Exfoliation of the outer layer with HF can often improve electrode performance. If this method
can be used to regularly remove the inner and outer layers, the electrode life is almost unlimited.
4. The storage of the reference electrode Silver - silver chloride electrode, the best storage solution
is in saturated potassium chloride solution, high concentration of potassium chloride solution can
prevent the silver chloride in the liquid junction precipitation, and maintain the liquid junction in
the work status. This method also applies to the storage of composite electrodes.
5. The reference electrode regeneration reference electrode problems caused by the vast majority
of liquid junction caused by blockage, the following methods can be resolved:
(1) Soaking fluid interface: 10% saturated potassium chloride solution and 90% distilled water
mixture, heated to 60 ~ 70
℃
, the electrode immersed in about 5cm, soak for 20 minutes to 1
hour. This method dissolves the crystallization of the electrode tip.
(2) Ammonia Soaking: When the liquid interface is blocked by silver chloride can be leaching
with concentrated ammonia. The specific method is to clean the electrode, the liquid vent after
immersion in ammonia 10 to 20 minutes, but do not let ammonia into the electrode inside.
Remove the electrode with distilled water to wash, re-add the internal liquid and continue to use.
(3) Vacuum method: the hose to match the reference electrode fluid interface, the use of water
suction pump, suction part of the liquid through the fluid interface, remove the mechanical
blockage.
(4) boiling fluid junction: silver - silver chloride reference electrode liquid interface immersed in
boiling water for 10 to 20 seconds. Note that the next time you boil, the electrode should be cooled
to room temperature.
(5) When the above methods are invalid, you can use sandpaper grinding mechanical method to
remove the blockage. This method may cause the sand under the grinding into the liquid interface.
Causing permanent clogging.