Chapter 7 Maintenance
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Chapter 7 Maintenance
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 electrode response time longer. CCl4 or soap can be used to wipe the dirt,
and then immersed 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 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:
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.
