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C h a p t e r 6
: M a i n t e n a n c e
1.
The storage of pH Glass Electrode:
Short-term : Stored in the pH = 4 buffer solution;
Long-term : Stored in the pH = 7 buffer solution.
2.
pH Glass Electrode Cleaning :
pH glass electrode cleaning glass electrode bulb contamination may make the electro
de response time longer. CCl4 or soap can be used to wipe the dirt, and then immer
sed in distilled water a day and night to continue to use. When the pollution is serious,
can be 5% HF solution for 10 to 20 minutes, immediately rinse with water, and then
immersed in 0.1N HCl solution for a day and night to continue to 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 hydrofluoric acid 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 saturated potassium chlo-
ride 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:
Soaking Fluid Interface:
10% saturated potassium chloride solution and 90% distil-
led water mixture, heated to 60 ~ 70 °C, the electrode immersed in about 5cm, soak
for 20 minutes to 1 hour. This method dissolves the crystallization of the electrode tip.
Ammonia Soaking:
When the liquid interface is blocked by silver chloride can be leac-
hing 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 in-
ternal liquid and continue to use.
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.
Boiling Fluid Junction:
silver - silver chloride reference electrode liquid interface im-
mersed in boiling water for 10 to 20 seconds. Note that the next time you boil, the
electrode should be cooled to room temperature.
When the above methods are invalid, sandpaper grinding can be used to remove the
mechanical method of grinding. This method may cause the sand under the grinding
into the liquid interface. Causing permanent clogging.
