With glass electrodes, a hydration gel layer is formed on a glass film surface submerged in water. The response depends on the ion exchange equilibrium for hydrogen ions produced between the hydration gel layer and the sample.
If the glass film dries out for an extended period, the hydration gel layer will no longer form easily, and the electrode performance will deteriorate.
Store electrodes as indicated below.
FAQAutomatic Potentiometric Titrators
Automatic Potentiometric Titrators
Q
What is the best way to store glass electrodes (pH electrodes)?
A
- Short term storage (less than 1 month): Store the glass electrode submerged in pure water.
- Long term storage (more than 1 month): Store the glass electrode submerged in a 1:1 volume ratio mixture of a pH4 standard liquid and a 3.3 mol/L aqueous potassium chloride solution.
